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United States Coast Guard
U.S. Department of Homeland Security

GPS User Issue Detection & Evaluation (GUIDE) Tool

*Disclaimer: These reports do not validate or verify any degradation to the GPS Constellation. This display and reports are derived from user submissions to the USCG Navigation Center GPS Problem Reports page. Size, range and intensity of the heatmap displayed is representative in nature only and does not represent real world impacted areas. To report a GPS Problem Report, click here: Report a Problem | Navigation Center (uscg.gov)
Note: the default view is the LAST 30 DAYS. Use the map menu to select a different time frame.

 
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Index Disruption Date Location Type Description Cause Closed Date
758 10/16/2025 Easton, Maryland Automobile USER: Upon entering zone listed above, gps directions informed driver to make u-turn and would not correct. Closed Waze app and re-opened Waze.
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 10/21/2024
764 10/25/2024 Palm Harbor, FL Automobile USER: Our community in the GPS system is taking drivers for deliveries of groceries and products to a dental office past our condos and many of the drivers are foreigners and do not know our neighborhood
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 10/28/2024
763 10/22/2024 Long Beach, CA Other USER: Jammer detected for 4 min 23 sec. All GPS satellites lost acquisition and tracking during event.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/28/2024
761 10/21/2024 Jeddah, Saudi Arabia Marine USER: Loss of GPS
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/28/2024
760 10/18/2024 Jubail, Saudi Arabia Marine USER: Vessel currently conduct seismic survey along Saudi coast in Arabian Gulf, near Jubail Commercial Port. The loss of GPS signal was happen a few times during last two weeks. Also one time the signal was lost when there was a massive Iranian missiles attack against Israel.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/28/2024
759 10/17/2024 Gulf of Aqaba Marine USER: GPS Disturbance in Gulf of Aqaba, (Jamming & Spoofing).
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/21/2024
762 10/17/2024 Long Beach, CA Other USER: Jammer was detected for 45 min, 29 sec. During 1st 10 min, all GPS satellites lost acquistition and tracking. Similar event occurred about an hour later but was shorter in duration.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/28/2024
756 10/13/2024 Port Sudan, Sudan Marine USER: Approximately 20 nautical miles from Port Sudan pilot station, GPS signal became lost and then placed us approximately 60nm from our location, well inland. This disruption remained for 6 hours. Several vessels in the vicinity reported the same interference.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/21/2024
757 10/13/2024 Gulf of Aqaba None USER: wanted to inform you that since entering the Gulf of Aqaba, we have experienced ongoing GPS signal disruption as of 13 October 2024, 23:30 LT (GMT+3).
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/21/2024
752 10/08/2024 Ras Tanurah, Saudi Arabia Marine USER: GPS Disruption occurred from 00:50LT until 03:18LT on 8th Oct 2024
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/14/2024
753 10/08/2024 Persian Gulf Marine USER: Continuous Loss of GPS Signal
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/14/2024
754 10/08/2024 ISTANBUL, TURKEY Marine USER: On Oct. 8th, 2024 at 13:13, while docked in Istanbul, Turkey – Galataport pier 3-4, MS Riviera lost the GPS 1, 2, AIS, and Speed log signals for approximately 4 hours. Our Technical Department tried to restore the signal by resetting all GPS units, but unfortunately, the issue remained the same. The Officer on Watch communicated with two other vessels located in Galataport as well, and they were experiencing the same issues. At 17:30, the GPS 1, AIS, and Speed log signals came back in service. MS Riviera departed from Galataport at 18:00. On Oct. 9th, 2024 at 02:00, during our crossing through the Dardanelles Strait, the GPS 2 signal came back in service.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/14/2024
751 10/06/2024 Cape May, New Jersey Automobile USER: GPS signal for Google maps Apple Maps and in car navigation is Inaccurate by a few miles
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 10/14/2024
748 10/02/2024 Ras Tanura, Saudi Arabia Marine USER: GPS SIGNAL LOST FROM 0600 LT / 02 OCT 2024.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/07/2024
749 10/02/2024 Ras Tanura, Saudi Arabia Marine USER: GPS showing 27-34.186N 052-31.561E
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/07/2024
747 09/29/2024 Jeddah, Saudi Arabia Marine USER: we experienced a GPS disruption/loss of signal today, 29 September 2024, at 21:30 LT (GMT+3). The disruption is still ongoing, approximately 70 NM southwest of Jeddah port.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/07/2024
746 09/28/2024 Elon, North Carolina Transportation USER: This is an ongoing issue that is ONLY affecting MY address. Nobody around me other than myself is experiencing their address showing up elsewhere & this has been ONGOING for several years
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 10/07/2024
744 09/27/2024 Gulf of Aqaba Marine GPS position was erratic at first, moving maybe 1/4 mile increments then GPS jumped to a position 200miles a way and just stayed there. GPS came and went for 11hrs while we transited up the Gulf of Aqaba. Towards the northern half of the Gulf the GPS stayed continuously on a position about 150 to 200 miles away and never came back. Upon reaching the dock in Aqaba the pilot reports local GPS had been out for months.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 09/30/2024
742 09/22/2024 Waynesville, North Carolina Transportation USER: We live on a private road off Interstate I40. We have 18-wheeler trucks down our road several times a day due to their GPS sending down or dead-end road with no turn around. They have caused a lot of property damage that the homeowners have had to take care of. We need help!!!!
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 09/30/2024
741 09/18/2024 Kothrud, Pune Other USER: Unable to get any GPS data since 18/9/2024
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 09/30/2024
738 09/10/2024 Los Angeles, California Other USER: All satellite reception lost for 2 minute period during jammer event.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/16/2024
739 09/10/2024 Los Angeles, California Other USER: All satellite reception lost for 2 minute period during jammer event.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/16/2024
740 09/10/2024 Colorado Springs, Colorado Research USER: Using a low-cost, but capable GNSS receiver integrated into a remotely monitored system that has been installed at the Colorado Springs Municipal Airport, we detected indications of intermittent Radio Frequency Interference on GPS L1 (1575.42 MHz).
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 09/23/2024
736 09/08/2024 Elon, NC Transportation USER: Plane overhead for reference was N382MG.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/16/2024
729 09/03/2024 Long Beach, Ca. Other USER: Jammer detection duration: 10 minutes detected
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/09/2024
730 09/03/2024 Long Beach, Ca. Other User: Jammer detection duration: 7 minutes
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/09/2024
731 09/03/2024 Long Beach, Ca. Other USER: Jammer detection duration: 3.5 minutes
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/09/2024
732 09/03/2024 Long Beach, Ca. Other USER: Jammer detection duration: 6 minutes
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/09/2024
733 09/03/2024 Long Beach, Ca. Other USER: Jammer detection duration: 6 minutes
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/09/2024
727 08/31/2024 Jeddah Marine USER: Loss of GPS
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/09/2024
728 08/31/2024 Yanbu, KSA Marine USER: Vessel loose GPS signal and GPS showing extreme far position from our actual position.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/09/2024
737 08/29/2024 Los Angeles, California Other USER: All satellite reception lost for 9 minute period during jammer event.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/16/2024
722 08/28/2024 Iran Marine USER: Continuous Loss of GPS Signal
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 09/09/2024
723 08/28/2024 Qatar Marine USER: Outage of GPS Signal/position in one of our projects marine DP2 vessel.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 09/09/2024
724 08/28/2024 Ras Tanura Marine USER: Vessels actual position was in Rastanura port - 26° 39.8391' N 050° 14.0552' E . There were continuous outages from 1300 to 1600. From 1615 to 1900 ships position was shown around 27° 34.5533' N 052° 31.1280' E , in Iranian land,
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 09/09/2024
725 08/28/2024 RASTANURAH, SAUDI ARABIA Other USER: Im Capt Ferdinand Calingasan onboard and master of MT KAPSALI, we expereinced the loss of GPS signal on 28th August 2024 at 06:30-23:00 UTC, while the vessel was heading to the southern anchorage of Rastanurah, Saudi Arabia. The vessel was anchored at LAT: 26 40N and Long 050 14E. on 28 August 2024 1300H UTC
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 09/09/2024
720 08/25/2024 Ras Tanurah, Saudi Arabia Marine USER: Vessel Currently at Anchor off Sea Island Terminal at Ras tanurah. Vessel has been losing GPS Data intermittently.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/26/2024
718 08/20/2024 Zwingen, Switzerland Communications USER: The positioning was 30 km away
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/26/2024
716 08/14/2024 Novi, Michigan Automobile USER: Both my GM trucks built-in Nav and iPhone could not locate for about 15 minutes. Independent of each other. They where bouncing around with about 2 miles of error typically.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/26/2024
717 08/14/2024 Yanbu, Saudi Arabia Marine USER: During drifting 21 nm off Yanbu south channel vessel lost both GPS signals completely
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/26/2024
712 07/24/2024 Dulles, VA Automobile USER: I started to leave Dulles using Apple Maps via car play on my car. It was acting a bit weird. After traveling a while, when I left route 267 and enter 495 North (towards Richmond) it got really bad, tracking was completely loss and it would put me several miles away. Both the build in car unit and the phone. Right before exiting VA into MD Google maps started to function better, Apple Maps would work but it was very jumpy. The vehicle build in unit was completely off. It never corrected itself, I arrived home at California MD and still said I was in VA, it almost looked like it was tracking backwards.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/05/2024
710 07/18/2024 Titusville, FL Automobile USER: While driving to work from Maitland, FL to Titusville FL, I noticed my iPhone 12 Google Maps display going erratic and placing the receiver location symbol south of the 408 expressway into nearby neighborhoods. I rebooted the iPhone, restarted Google Maps, but the issue remained. I then switched to my 2022 Audi A5's native GPS navigation system and saw the same behavior with the car location showing the same as my iPhone. I rebooted my iPhone again but to no avail. I watched this behavior continue as I drove eastward on the 408 and then onto US Hwy 50 toward Titusville, FL. As I continued eastward, the drift to the south versus true position increased. As I crossed the Saint John's River on Hwy 50, the iPhone and Audi receivers showed my position to be south of the 428 Beach Line expressway in the swampy off-road areas approximately 6 miles away. As I approached my work location (Boeing building in Titusville, FL), I rebooted my iPhone again and it returned to normal service but my car's received stayed "locked onto" whatever interference signal was generating the drift even as I parked in the parking lot. The car receiver returned to normal service when I started the car and left work and around 7 PM. Both receivers showed normal operations the entire trip home to Maitland, FL. Note that I'm an electrical engineer having worked in Electromagnetic Effects and RF Communications fields for 35 years primarily at the Kennedy Space Center Electromagnetic Effects Laboratory and with the USAF Eastern Test Range Frequency Manager. Therefore, the behavior I noticed was very concerning that 2 receivers of different designs were seeing the same erratic behavior suggesting an outside interfering or spoofing source.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 07/29/2024
709 07/11/2024 Dalian, China Marine USER: GPS outage period 11.07.2024 0736 UTC (GPS PSN 38 21.9 N / 121 23.4 E)  to  0924 UTC (GPS PSN  38 16.4 N / 121 39.0 E) Checked with other vessel's in the vicinity, almost all of them were reporting same issues. Vessel equipped with Trelleborg SafePilot P3 unit and which was not affected by this incident.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 07/29/2024
705 06/19/2024 Miami, FL Automobile USER: In both gps systems, my phone and the car, the signal is jumping at the same time. Happens about every 30 seconds.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 07/01/2024
704 06/17/2024 Djibouti Marine USER: Vessel Received GPS disruption from past 1 hour.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/26/2024
703 06/15/2024 YANBU, KSA Marine USER: All GPS receivers (3 GPS fitted on board) lost signal: received alarm on all Navigation Equipment: No GPS Fix. Disruption last exceptionally long (over 30 minutes) in which period there was no any position on Navigational Equipment like on ECDIS, Gyro and ARPA.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/26/2024
698 06/10/2024 Dumfries, VA Automobile USER: I was on my weekly commute from Richmond, VA to Sterling, VA and noticed that my GPS map starting acting up around the Rt. 234 intersection with Interstate 95. It remained wacky all the way to Sterling. It was directing me to roads off of my usual path, had my location cursor moving through areas with no roads and the map kept rolling as it tried to reroute me to who knows where. My normal track is 95N to 123N to 286N to 66W to 28N to Sterling. The GPS was non-functional from the time I noticed it to the time I pulled in at my office.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/17/2024
696 06/07/2024 Mountain View, CA Automobile USER: Both phone and car GPS units are 500-1000 feet off when showing current location. Have shut down phone and location services multiple times. Service has been incorrect for 1+ hrs over 40sq miles of driving
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/17/2024
695 06/05/2024 Crown Point, NY Other USER: I have a complete outage of all GPS signals on all of the devices on board my boat. I am in Lake Champlain. I have plenty of clear sky around me. All of these devices were operating yesterday with no problems, although I did note a temporary outage on my chart plotter in the morning. Each device has its own antenna system. There is nothing different running today that might be causing interference.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/17/2024
693 06/02/2024 Gulf of Suez Marine USER: The GPS signal lost had been recorded between 0740 UTC and 0805 UTC on 2nd June 2024 while the vessel "Safwa" IMO No. 9223887 was on approach to Gulf of Suez. The GPS signal lost was recorded at all receivers onboard. Presently, all back to normal and no any anomalies.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/17/2024
694 06/02/2024 Port Said, Egypt Marine USER: No Comments provided
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/17/2024
692 06/01/2024 Gulf of Suez Marine USER: Both GPS restored itself 01-Jun-2024 at 06:47 LT (03:47 UTC) in position: Lat: +27.431166, Lon: +034.221716.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/10/2024
691 05/26/2024 Fangchenggang, China, Marine USER: On 26 May 2230 LT, while approaching berth 501 Fangcheng Port - Both the GPS lost signal. Later it was confirmed by the local agent that the terminal has installed GPS Jammer. Prior departure on 28 May 2024 the jammer was switched off by the terminal and the GPS signal was restored.
NAVCEN: No additional information. 		Other 06/10/2024
688 05/17/2024 Port said , Egypt Marine USER: At 0545Lt vessel lost gps signal today on 17 may 2024 and every 10-15 seconds the signal is loosing hence no position data available for the vessel. The Gps fail error causing gyro failure and AIS failure as well. This is continuing till now. Currently vessel at anchor in Port said anchorage.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 05/20/2024
686 05/14/2024 Huelva, Spain Marine User: Vessel equipped with 2 Kongsberg DPS 232 GPS units. Simultaneous loss of both. Vessel also equipped with 2 X Furuno GP-170 units - no alarms present - PDOP = 1.3m
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 05/20/2024
715 05/11/2024 North Garden, VA Other USER: I was driving northbound on U.S. Route 29 going approximately 55 mph around 2:15pm EST when I began to experience GPS disruptions on "application: Google Maps". The application began to rotate uncontrollably side to side for approximately 20 minutes on and off and could not accurately identify my position.
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 08/05/2024
680 04/24/2024 Persian Gulf Communications USER: VSAT Communications including Data and voice lost over a period of approx. 36 hours. Informed by Technician of Marlink Service Desk that vessel has "GPS jamming (GPS interface) and the VSAT will not work properly and the Antenna can't detect any satellite until the vessel is headed out of the zone." Re-boot of ACU seemed to break the jammed connection, and signal to the VSAT restored after Antenna was able to lock onto beam.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/30/2024
679 04/18/2024 Marine USER: Bab El Mandeb strait
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/22/2024
675 04/12/2024 None USER: CALLER REPORTED A POSSIBLE CYBER SECURITY ATTACK ON THE VESSEL APL EAGLE AT THE INCIDENT LOCATION. THE CALLER STATED THEY EXPERIENCED AN ERRATIC TRACK LINE ON THE VESSELS CHART DISPLAY, THAT SEEMED TO TRY AND TAKE THE VESSEL OFF OF THEIR COURSE. THIS INTERFERENCE TOOK PLACE FOR A FEW MINUTES, AND THEN WENT BACK TO NORMAL. THIS VESSEL EXPERIENCED THIS A FEW MONTHS AGO WHILE IN THE SAME AREA. THE VESSEL IS A US FLAGGED SHIP WHO'S PORT OF REGISTRY IS WILMINGTON, DELAWARE. THE VESSEL HAS NEVER BEEN TO THE UNITED STATES, AND OPERATES IN JEBEL ALI, DUBAI. THE U.S. COAST GUARD ACTIVITIES EUROPE DOES THERE INSPECTIONS. WILMINGTON, DELAWARE WAS USED AS THE INCIDENT LOCATION, BUT THE INCIDENT ACTUALLY OCCURED AT THE COORDINATES PROVIDED IN THE PERSIAN GULF.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/15/2024
674 04/11/2024 Marine USER: Our vessel on entering Gulf of Aqaba experiencing intermittent GPS spoofing & later after an hour GPS signal has been completely lost. Vessel using GPS for navigation purpose.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/15/2024
676 04/11/2024 Marine USER: On 11th April, 1838 UTC, MT Toya while approaching the port of Ras Tanura, KSA experienced loss of position (suspected GPS interference) which was rectified within one minute. However, the HDOP high alert remained for another 10-15 minutes.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/15/2024
669 04/09/2024 Marine USER: While underway, vessel had faced No.1 & 2 GPS no fix alarm occurred at 0710LT on 03/Apr/2024. and still GPS signal not restored properly.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/08/2024
681 04/09/2024 Temple City, CA Automobile USER: Constant intermittent issues with GPS in the San Gabriel valley of California near Los Angeles. This is constant and frustrating. Never a problem with using GPS in New York. Please fix
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 04/30/2024
677 04/07/2024 Marine USER: MV APL EAGLE, 170.0M Geared Containership, 1700 TEU, experienced GPS position anomaly indicative of GPS Spoofing today 12th APRIL 2024, 1200LT (ZD-3)/0900UTC. Sea area: Persian Gulf. 0912Z Position: Latitude: 26-19.9N Long. 051-39.3E Noted similar errors to the previously reported incident 9th November 2023. Presented on ECDIS screen as erratic track. Noted Position errors of more than 0.5nm on ECDIS history track. Suspected interference with Differential signal. Both GPS units appear to be functioning normally, and errors cleared after a few minutes.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/15/2024
673 04/06/2024 Other USER: We are noticing a disturbance in our GPS systems when we use it to navigate trough traffic. Since I cannot find anything online about it I thougt I would report it here.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/08/2024
672 04/05/2024 Automobile USER: Driving between my home and destination, both in South Surrey, BC, Canada, the vehicle location was reflected significantly off of the road, causing the map application to be ‘confused’, telling me to make turns that didn’t make sense. Several times during the 15 minute drive, the vehicle map icon appeared to ‘jump’ to a new location (within meters).
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/08/2024
668 04/02/2024 Marine USER: Pls be informed that today, on 02 Apr 2024, during the day, vessel’s GPS exposed with jamming of the signals at the Port Said anchorage area. This is not only our problems, same situation on board other vessels in vicinity.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/08/2024
667 04/01/2024 Marine USER: Interference with GPS Signal of all Vessel’s in the vicinity for approx. 1.5hrs
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/08/2024
666 03/31/2024 Marine USER: Vessel had faced GPS signal jamming when navigating near Juaymah Terminal, Saudi Arabia. This was experienced from 28th evening Saudi arab time till 31st morning time intermittently with long outage time. Presently the signal is stable.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/08/2024
664 03/30/2024 Transportation GPS disruptions in the East Mediterranean when vessel is underway from Alexandria, Egypt to Port Said, Egypt. This is one of the many occurrence of GPS disruptions until vessel reach Port Said Southern Holding Anchorage at 30 Mar 2024 2136UTC. It is more frequent when vessel was approaching Port Said Southern Holding Anchorage. Moreover, even at anchorage area, still we are having GPS signal disruptions and also other vessels in the vicinity is heard on VHF Ch 16 having the same issue.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 04/08/2024
661 03/25/2024 Research USER: Received adequate satellite counts but gps reported velocity and other quality metrics were very unstable and not conducive to drone flight
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Insufficient Information 04/08/2024
670 03/23/2024 Transportation USER: As I am driving my GPS will randomly shoot across maybe 1/2 mile off course and keep trying to recalculate. This recently began beginning 3/23/24 and happens intermittently to this day. I have deleted the navigation applications (Google Maps, Waze, and Apple Maps) and reinstalled them and they still do this. I have checked my phone for updates and Apple has nothing to report. It was even stranger when my car began doing this 3/30/24 and it is at the same time my phone GPS goes haywire. I am not sure what is going on.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/08/2024
658 03/19/2024 Other USER: It is believed that my address is being GPS Spoofed by a NC/Alamance County Emergency Management employee. I have lost over $1,000 in merchandise. Alamance County Sheriff's Office refuses to investigate as it is believe to be 1 of the sheriff's relatives. This has been an ongoing issue. This time it was a FedEx driver for the 2nd time in a week.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 04/08/2024
659 03/19/2024 None USER: We have continuous alarms concerning 5G base stations. Alarms: GNSS Clock Output Unavailable, GNSS Locked Satellites Insufficient, all over Cyprus. No satellites are tracked and bts go to holdover. Many alarms clear after some time and some restore back after gps board reset. We've also checked longitude and latitude of a BTS and it was shown on a wrong place. Please inform us for any problems in the area of Cyprus. Thank you!!!
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 04/08/2024
657 03/17/2024 Communications USER: I'm an engineer. At this approximate time my gps device (android maps) would move my identified location by several hundred meters every few seconds and constantly switch directions I was traveling. There were few tall buildings in my area. My vehicle gps locator (hyundai) also was giving errors that it could not determine a stable location. My friends gps (apple maps) was doing the same. And two rideshare drivers (uber) reported to us that they, too, were experiencing the same exact disruption say that time and were having trouble navigating and finding their riders. By 8AM, everything was normal in this area. This could have been an illegal spoofing incident.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 03/18/2024
656 03/14/2024 Communications USER: Apple phone Waze and Apple Maps
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 03/18/2024
654 03/11/2024 Communications USER: While jogging big energy level from mobile phone radio app in german language (Crystal Missions producent) in Poland forest or like sky is the limit. More hot than usual. Someone 5 times turned off this radio app by stop button in my phone while jogging. Area is always international tourist attraction for many joggers and big RTCN Jemiołów tower transmitter 320 meters with military zone.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 03/18/2024
665 03/09/2024 Automobile USER: GPS on DASHCAM is not receiving any signal, unable to track speedometer or other warnings on the DASHCAM through GPS. GPS display on DASHCAM screen is marked with a Red Cross. Everything else with DASHCAM works perfectly, eg; TIME/DATE and basic video recording. This error has been happening for about a month. I am finding it disturbing as I rely on the Safety Features the DASHCAM provides through GPS.Is there any explanation as to why it has stopped working.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		User Equipment 04/08/2024
653 03/06/2024 Marine USER: GPS Disruption was intermittent, lasted less than 1 min
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 03/11/2024
652 02/23/2024 Marine USER: Reports loss of GPS in the South China Sea.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/26/2024
655 02/14/2024 Communications USER: Our ADVA OSA5430 loses GPS signal every night between 2am and 5am since at least Jan 2024. The 360 degree antenna on the roof has been checked and has nothing near and is pointing straight up. Signal level is good during the day.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 03/18/2024
651 02/09/2024 Marine USER: 1. Vessel’s Name: Lucina Providence 2. Type of Incident: GPS Signal interference 3. Date and Time of Incident: 23 Feb 2024/ 1028LT ( 23 Feb 2024/ 0228 UTC) 4. Ship’s Position: 07°32.5’N; 108°13.1’E 5. Status: Underway, full speed at sea. 6. Brief Description of the Incident: Interference with GPS Signal of all Vessel’s in the vicinity for approx. 38 Min 7. Others: a) GPS signal interference to both DGPS receiver and independent AIS. b) All Vessel’s in the Vicinity ( 15NM radius approx.) had interference. c) 1106LT, signal regained. HDOP within limits. GPS signal satisfactory. Matter resolved. d) During this incident vessel is in south China sea and there were three unidentified vessels can’t be seen on AIS.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/26/2024
649 02/07/2024 Automobile USER: Tried two different systems. Apple iphone (waze app, and google maps) as well as the integrated gps in my truck (ford f150). Neither system was tracking for approximately 1.5hrs. Was traveling east from Columbus OH to Pittsburgh PA on I70. At times system showed i was traveling west on that road, and or running parallel off the road 30yds….. Applications kept trying to correct course infinitely as the system wasn’t tracking. Rebooted both systems, nothing helped. System returned to functioning after about 1.5hrs of in correct operation (and i had travelled about 90miles east of Columbus OH).
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/26/2024
648 02/05/2024 Automobile USER: As soon as I start the google maps it take the position and immediately after I got the message GPS signal lost. The only way to get the position again was to close the app and start from the beginning. I got the position and after few seconds the message GPS signal lost. This never stops for about 40 minutes. Then I reach my destination and I have not checked anymore the GPS signal. Thanks.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/12/2024
647 02/03/2024 Other USER: This anomaly has been ongoing since approximately January 3, 2024, and occurs at and around the junction listed at the above lat and long. When I approached that junction, all of the active GPS devices started to shift off in the incorrect direction. Normally, around 30-40 degrees of deflection from the route of travel. This deflection generally continues to occur for approximately 3-5 miles after the anomaly begins, and then the GPS corrects back to the route of travel. This anomaly tends to occur between around 1100z to sunset (around 2300z). My Jeep Grand Cherokee's integrated GPS has a satellite details page, and all of the satellites have high signal strength and an ample number of satellites. Due to the consistency of the interference and its start and stop timing, my initial assumption was some sort of ground-based interference either as unintentionally generatorated RFI or intentional interference. I will happily provide screenshots from both my iPhone and photos of the details page from my car if requested.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/26/2024
646 01/30/2024 Communications USER: This is a broadcast and microwave relay site. The interference is happening on or near the site. I used my Anritsu spectrum analyzer with a passive directional antenna and saw interference in and around the GPS L1 frequency band but could not find its source. It has been happening for over two months now.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/26/2024
644 01/27/2024 Marine USER: As understood, there is a ongoing GPS disruption/ jamming in Jizan area
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/12/2024
640 01/23/2024 Marine USER: Intermittent disruptions. "Loss of position/Alarm window 212 " message appeared during disruptions. Appeared from 13:06 UTC to 14:40 UTC
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 01/24/2024
642 01/23/2024 Marine USER: Vessel underway from Jubail to Fujairah. Vessel experienced loss of GPS two times in less than 24 hours while in transit in Persian Gulf. Position of first occurrence started on 23 Jan 2024 23:00LT(+3UTC) in position 27 08.8N 049 50.4 E and ended at 2323LT (+3UTC) in position 27 12.1N 049 54.1E. Second occurrence happened on 24 Jan 2024 at 0523LT (+3UTC) in position 27 10.8N 051 16.2E and ended at 0630LT(+3UTC) in position 27 08.8N 051 31.3E
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/12/2024
643 01/23/2024 Marine USER: -At 23/01/2024 15:20:00LMT an alarm sounded on No2 GPS stating (no position fixing) and a message appeared stating that it was unsafe for navigation. During the time of first alarm 12 satellites were observed to be tracked. After 30 minutes and when the gps signal totally lost, observed that 0 satellites were tracked. No1 GPS was still properly working with no alarms and safe navigation indication was enabled. After 30 to 40 minutes the same alarm of no position fixing sounded also on No1 GPS and the position from ECDIS monitor appeared to be on land 50 - 60nm off original psn. The issue commenced at 23/01/2024 15:20:00LMT and lasted until 24/01/2024 00:00:00LMT. Positioning from LAT: 16.900 N & LONG: 040.900 E until LAT: 18.700 N & LONG: 040.3 E. According to the above, GPS loss signal is described as spoofing, both equipment was still on but unable to receive any signal from satellites.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/12/2024
638 01/22/2024 Marine USER: Reporting loss of GPS at Jizan DW channel entrance.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/12/2024
641 01/22/2024 Research USER: White Sands Missile Range conducts testing several times during the year. These tests usually disrupt our GNSS receivers reducing the SNRs sometimes small amounts and sometimes to the point where the receivers lose lock and stay that way for hours. Up until last year these test periods were listed on the Approved GPS Testing Schedule. I believe that schedule was only updated twice last year. The current one is still for 2023-06-30. Signal degradation was also seen in August, October and December of 2023. This problem was for just a very short amount of time at approximately 0703UT. Plots of the interference can be seen at www.passcal.nmt.edu/~bob/gpsmon/7gmwsmr.html, though this one is pretty short/small. Another report will be made for 2024-01-23 on the 24th (after daily results are plotted).
NAVCEN: Thank you for bringing this to our attention, the GPS testing page has been updated.		 GPS Testing 01/24/2024
636 01/19/2024 Marine USER: Vessel is fitted with 2 GPS equipment (FURUNO GP-150). Both GPS appear to be jammed in Jizan area (Saudi Arabia) due to proximity of Yemen border. At time, the location is showed on land in Yemen, somewhere near the border between Yemen and Saudi Arabia.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/12/2024
645 01/18/2024 Marine USER: When vessel was approaching the port of Haifa, Israel disruptions of both GPS/GNSS signal occured. At first it was intermitent and as vessel progressed sailing towards pilot station both GPS/GNSS signals were completely lost. At times, during anchorage stay, the vessel experienced spoofing as GPS position observed inland of >50nm from vessel's actual position. When the vessel heave up anchor and commenced proceeding to pilot station it was observed that the GPS/GNSS receiver was working properly for few minutes and again signal disruption occured to all GPS/GNSS receivers until the vessel berth and commence cargo operation. At departure the vessel had no signal coming from both GPS/GNSS until about >20 nm from Haifa, Israel.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/26/2024
635 01/17/2024 None USER: Hi, there has been temporary RAIM outages for Lord Lowe Island in AUSTRALIA. See RAIM NOTAM below. However, the problem is the outages predicted for TSO-C146A for FAULT DETECTION AND EXCLUSION are actually also applicable to TSO-C129A for FAULT DETECTION.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found possible to have impacted GPS performance due to minor geomagnetic storming. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 02/12/2024
634 01/14/2024 Communications USER: This has been an ongoing issue for the last month. All nav systems in Ocean City, NJ on iPhone and vehicles lose GPS signal for long periods of time and are off by miles. Essentially the problem comes and goes and is solved by driving North for about 8 miles on the Garden State Parkway. Because it’s happening seemingly randomly it’s hard to pinpoint but it’s been happening almost daily for the last month. Again, this isn’t an equipment issue because I’ve tried three different systems and it also isn’t consistent but when it’s not working- none of the devices can find a correct signal.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 02/12/2024
637 12/18/2023 Law Enforcement USER: Hello, I am at Telecommunications Specialist with Drug Enforcement Administration in Seattle, WA. I am seeking any reports of GPS (active/LNA) antenna failure around 12/18/2023. Several agency radios w/ GPS receivers no longer receive GPS signals. I suspect it may be related to the X2.87 solar flare on 12/14/2023 so I'm looking to confirm other incidents. Any ideas/help would be appreciated.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found possible to have impacted GPS performance due to X2.8 solar flare. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 02/12/2024
631 12/16/2023 None M/V NORSEINE , IMO No. 9596052 experienced GPS signal failure at both GPS units simultaneously. The event happened during transiting Bab El Mandab Strait.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/20/2023
629 12/14/2023 Automobile USER: Apple iPhone also 2024 Audi Vehicle gps was also wrong Strange that two different devices were so far off.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 12/20/2023
630 12/14/2023 Other USER: I am stationed two to three times a month in the same village, in Malaysia, even though I live in France. This is happening on two phones, one of which has been reset. I can send you my Google routes. I tried to use the GPS-test application to check if I was a victim of GPS spoofing. I was then able to see Russian satellite number 15 (C/NO 22.4 elev 45 azimuth 191) and American satellite number 27 (C/NO 16.5 elev 43 azimuth 289) on 12/14/2023 at 10:38 p.m. local time. When I returned to normal a few minutes later, I no longer saw these satellites. Can you help me define the problem? Am I a victim of GPS spoofing locally?
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 12/20/2023
627 12/11/2023 Other USER: I'm a home user wanted to let you know on my Samsung galaxy watch 4 and Samsung galaxy a13 5g android cell phone when gps or location turn on I don't get any lock on any satellite from gps just fails also I'm in desplaines il any wear near desplaines il or in town this happen use it to get place but failing since can't get a lock on gps sat I know this dew to used a testing app on android it told on 0 sat lock
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		User Equipment 12/13/2023
624 12/09/2023 Automobile USER: Noted navigation anomalies while using iPhone and Waze app. GPS position several hundred feet off. iPhone and app reset several times. Cross checked results with a handheld Garmin eTrex. GPS satellite page showed good almanac and sats in view, but intermittent/poor lock. “Accuracy” indicated ~200ft. Anomalies started around 10:30 local time, continued till at least 10:45 local time and was ongoing when I turned equipment off. Note: this was in an automobile. I use GPS daily for traffic/commute information. During daily use, I have no problem with GPS reception in this automobile. I understand that iPhone/apps may be suspect, but the cross check with Garmin handheld indicates a true anomaly.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/13/2023
621 12/03/2023 Marine USER: Loss of position/Alarm window 212 " message appeared during the time of disruption. Its came back to normal once acknowledged.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/06/2023
620 12/01/2023 Other USER: All mining vehicles report position errors accross a number of different mine sites. area around 500kms. Scintillation seems very high on Trimble planning tool online
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found possible/likely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Other 12/06/2023
633 12/01/2023 New York City Communications USER:Was driving and the GPS (google maps) was all over the place, for example it was telling us to make a local street turn while driving on a highway. It was directing us to go West when the destination was South. Both of our devices were producing similar incorrect results, both devices were of different models Samsung Galaxy Mobile phones both restarted to troubleshoot the GPS navigation issues. We were driving in NYC from Queens to Brooklyn and experienced this anomaly only that 1 night.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Address appears on google maps. User was sent data mapping information. Currently no additional information.		 Insufficient Information 01/11/2024
617 11/30/2023 None USER: USCG SECNY was notified of ship jamming incident on Carnival Cruise Line Cruise ship "Carnival Venezia" (November 30th, 2023) Pilot on Carnival Cruise Line Cruise ship "Carnival Venezia" reported jamming detected with Sandy Hook Pilot's Portal Piloting Unit (PPU) while transiting into New York City, NY. This jamming caused interference in ships real-time communications processes. This jamming was detected at least 2 times in locations, Ambrose Pilot Boarding Area and in Gravesend Bay, NYC. Sandy Hook Pilots bring SafePilot Software and CATXT V5 Antennas onboard. Trelleborg is the manufacturer.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/06/2023
618 11/30/2023 None USER: USCG SECNY was notified of ship jamming incident (November 30th, 2023) Pilot on Carnival Cruise Line Cruise ship "Carnival Venezia" reported jamming detected with Sandy Hook Pilot's Portal Piloting Unit (PPU) while transiting into New York City, NY. This jamming caused interference in ships real-time communications processes. This jamming was detected at least 2 times in locations - Ambrose Pilot Boarding Area and in Gravesend Bay, NYC. Sandy Hook Pilots bring SafePilot Software and CATXT V5 Antennas onboard. Trelleborg is the manufacturer.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/06/2023
619 11/23/2023 Marine USER: GPS display was completely blank - no latitude and longitude presented. Restarted GPS receiver with unsuccessful result. GPS signal was recovered only after departure from Aqaba/Jordan on 25th November at 00:00 LT (LT=UTC+3) in position 28°59.4’N 034°46.1’E and once we moved out off Israel/Jordan territory.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/06/2023
628 11/22/2023 Marine USER: USCG LANTAREA was notified by the Health, Safety, Security, Quality, and Environmental (HSSQE) Manager for Seabulk that the U.S. flagged M/V GREEN COVE (IMO 9181560) experienced suspected GPS spoofing while on inbound transit to Aqaba. The GPS information for the ship, the Captain’s GPS watch, and Polestar all show that the vessel is in Cario. HSSQE Seabulk Group will continue to monitor.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/20/2023
615 11/16/2023 Automobile USER: 3 separate devices (2 different models of iPhone and the onboard navigation of an Audi Q3) showed an incorrect location which was repeatedly sliding around a wide area (10's of miles) in random directions. All 3 devices were rebooted and user moved up to 1 mile and still experienced the errors. After a period of 30 minutes driving ~20 miles south the locations on all devices corrected and began to function normally.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		11/27/2023
614 11/06/2023 Marine USER: Number of satellites tracked on occurrence are unknown. Insufficient Information 11/20/2023
612 10/20/2023 Marine USER: VESSEL HAD ENTERED ISRAELI WATERS AND FROM 16' IN WE LOST ALL GPS INPUTS. NO SATELLITE WAS SPARED. IN CONSULTION WITH IDF IT MAY BE WEAPON RELATED Unknown Interference 10/30/2023
616 10/17/2023 Other USER: Spacecraft locked onto an apparent spoofed GPS signal while transiting southern Russia, east of Ukraine. GPS jammed environment has previously been experienced, with number of GPS solutions dropping to 4 or fewer. most of the time, when the spacecraft leaves the jammed environment, the GPS signal returns. This event required Flight Operations Team intervention.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 11/27/2023
610 10/09/2023 Aviation USER: Hello. Several operators have reported GPS reception problems today over our territory. This is highly unusual. We are still investigating the issue. It concerns both helicopters and civilian jet aircraft.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/16/2023
608 09/30/2023 Transportation USER: I was driving on 495 S from Bethesda MD to Fredericksburg VA using Waze for navigation. Waze began malfunctioning and thought I was on some random side roads a good bit off to the side of 495 & began continually re-routing. Force restarted Waze, problem persisted. Had my passenger try switching to Apple Maps & it had the same issue, thought we were off on the side like Waze did. Thought it might just be my phone then so tried engaging my cars built in nav system and displayed the current gps location in the same inaccurate position as Waze was. At that point suspected it was not something with my phone but likely a broader GPS issue given it was happening across devices. Did not think it would help, but for the sake of trying, I powered my phone completely off since it was connected via CarPlay just to verify there was no possible way that my phone was somehow interfering with my card nav system (tho I don’t know how that would even happen anyway). My passenger took a picture of the cars nav system & Waze being simultaneously incorrect in the same spot. The issue persisted from 495 S through getting on 95 S until we were about 10 miles north of Fredericksburg.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/09/2023
609 09/30/2023 Marine USER: Noted multiple occasions of GPS short signal loss at Jizan Tanker anchorage B It was started on 29 Sep 23 around 1600 LT/1300UTC and continued until 30 Sep 23. First only GPS No. 1 was affected, however on 30 Sep 23 at 1000 LT/0700UTC both GPS units have lost satellite signal (none of satellite visible). Every occasion lasted few minutes and then signal recovered. This happened frequently, at present all finished. Vessel anchored on 15th Sep and all previous days GPS was operated normally.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/09/2023
607 09/27/2023 None USER: Ever since the tropical storm, the enter the GPS has been very, very intermittent. It's been off. It's been on. I can be on 64 and the GPS says no GPS signal and I use multiple devices including my vehicles. Keep saying the same thing so it's just not a single device. It's multiple devices reporting the same issue that this is signal or GPS concern and this is all 64 East and the zip code is 23185 Williamsburg. Virginia and it's been going on about 4 days now
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/02/2023
606 09/24/2023 Automobile USER: Intermittent, sudden, Gps drift made it appear as if we were several hundred feet North of Highway 58, moving, and icon appeared to be headed WNW instead of W, as Highway 58 is oriented. This was noticed 3 times, on our journey from Hinckley to Mojave.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/02/2023
604 09/20/2023 Surveying USER: Collecting data with WAAS enabled consistently worsened the GPS position accuracy. This was found over a period of 1.5 hours.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		User Equipment 09/25/2023
602 09/10/2023 Communications USER: We have 18 devices that utilize GPS to synchronize communications and all devices lost GPS signal at the same time. This has happened several times since 9/8/2023.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 09/11/2023
603 09/10/2023 Automobile USER: we were directed to a residence on grand ave . we wanted to go to the methodist hospital in des moines. the residence has experience so many people being misdrected that he had a permanent sign posted to go 4 miles north of his residence to find the methodist hospital.
NAVCEN: Provided user information to update mapping information.		 Mapping Issue 09/18/2023
600 09/07/2023 Marine USER: Vessel has been at anchor for four days in the same Kuwait "Waiting Area" anchorage. The GPS lost signal starting around 0615Z and then was intermittently obtaining a signal. Vessel remains at anchor and has power cycled the GPS unit several times throughout the day.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 09/11/2023
598 08/24/2023 Communications USER: General outage of NTP time sync during +- 16:00 and 17:00 24th August
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 08/28/2023
590 08/06/2023 Marine USER: This is M/T Mutriba was approaching Suez and while approaching in Gulf Of Suez experiencing intermittently loss of GPS signal on both DGPS receivers, AIS and GPS Compass. Loosing of Signals are very frequent. Presently vessel is at Suez anchorage. Suez VTS was informed on same and they confirmed that there is GPS Signal issue in the region. Moreover as per them many vessel are facing the same issue. Vessel Shifted to inner anchorage and from past one hour GPS signals are good and getting good fix.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/07/2023
594 07/19/2023 Other USER: During static operation with clear view of the sky two separate units experienced a week number decrease by 1 shortly followed by a complete loss of lock for 20 seconds.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/14/2023
582 06/15/2023 JAZIRAT JABAL ZUQAR Marine USER: GPS Disruption Commenced at 1555 LT (1255 UTC) in Position 14-05.7 N 042-14.4 E, Vessel was heading on a True Course of 151 Degrees and Speed 12.7 kts. The Disruption occurred 4 times with interval of 3 to 5 minutes.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 06/22/2023
579 06/02/2023 Sparta, Georgia Automobile USER: On three separate devices, GPS was either “not available” or showing a drastically incorrect location on the map. The issue has been consistent for more than 30 minutes for each device.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 06/22/2023
578 05/25/2023 Annapolis, MD Other USER: The tracking system on my boat sent an alert at 1:55 AM EDT (5:55 UTC) that showed a movement of approximately 130m for about 10 minutes before returning to the original location.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 06/22/2023
577 05/22/2023 Perris, CA Communications USER: Google pin wanders off beyond GPS margin of error, and snaps to exact wrong locations. It shows my pin in my neighbors house, and proceeds to jump to other neighbors houses in a clockwise like fashion. It jumps across the street in the backyard of a house a few houses down, and jumps back and forth doing this strange routine without ever fully zeroing out after gaining satellite signal from over 3 satellites. Please let me know what this may be, because the gps on my computer holds true and doesn't wander using a ublox gps on windows10.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. User was sent data mapping information. Other equipment operating properly. Currently no additional information. 		User Equipment 06/22/2023
574 05/13/2023 Constanta, Romania Timing USER: We have often GPS outages, almost every night in this city, on all cell sites in this city, but tonight the outage/interference is reaching as far as 45.452324 28.034280, aprox. 160km from the sea, which seems to be the source of masking/interference or whatever is happening.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 06/21/2023
572 05/06/2023 Montgomery, AL Automobile User: Gps position has been consistently ~300m south of actual position for the past few days. User: The location in Google maps and other apps moves around even though I am not moving.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. User was sent data mapping information. Currently no additional information. 		Insufficient Information 05/10/2023
571 05/05/2023 Norfolk Nebraska Communications User: In the area of Norfolk Nebraska the GPS for the last week or so has my position south and west of my actual location and it is impossible to navigate in the city at all. My GPS works fine everywhere else I have been and is off the same every time I go there. My phone does try and locate GPS alot in that area and once every few minutes it will correct itself and then go right back to being off track.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. User was sent data mapping information. Currently no additional information. 		Insufficient Information 05/10/2023
570 04/23/2023 BRISBANE AIRPORT Aviation User: Outage appeared to have started on 23 APR 2023 0030UTC and resolved around 23 APR 2023 2330UTC. Weather conditions were fine most of the time. Some moderate rain cloud cover/overcast on the following day before it resolved itself. Our GPS RAIM system has dual Trimble dome antennas mounted on the roof of our Brisbane ATS Centre facility with redundant paths and CTI SV12 receivers and servers rack-mounted within our Main Equipment Room.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/10/2023
569 04/17/2023 Youngstown, OH Other User: This issue is happening across several vehicles where the GPS has stopped. GPS is working, but not locking in on SAT's. Have verified drivers for the software.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. User was sent data mapping information and requested additional information with no response. Currently no additional information. 		Insufficient Information 05/10/2023
567 03/31/2023 Berlin Automobile User: When using build-navigation (in Audi A5 2020) and iPhone 13 mini with Google Maps, Waze, and build-in Maps applications, my location was off by ~100m at first (around 2:30 pm, local time GMT +1). Eventually, it resulted in a ~3km offset towards the southeast. I can provide a picture of the current vs. actual location, a video of how it looked on navigation applications, and Google Maps trace if needed.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Possible unknown interference. User was also sent data mapping information. Currently no additional information. 		Unknown Interference 05/10/2023
562 03/12/2023 KAVKAZ, RUSSIA Marine User: WHILE VESSEL AT KAVAKAZ OPL ANCHORAGE, RUSSIA. VESSEL’S BOTH GPS UNITS LOST POSITION MANY TIMES AND IT IS KEEP GOING AND COMING. SOME TIME IT IS NOT COMING FOR HOURS. ALARM CODE -212 LOST POSITION.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2023-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/10/2023
563 03/09/2023 Bratislava, Slovakia Research User: Everyday periodically - every 12 hours occurs the time window for 3-4 hours during which many GPS receivers are affected and report 0 satellites fixed = NO-FIX or generating bad timestamp for a while. This is probably caused by one of the satellites which is sending some incorrect data. When this satellite leave our area - everything works normally again. This problem is detected from 2023-03-09 and still happens every day twice time till now!
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/10/2023
559 03/06/2023 Indian Ocean, North of Soqotra Marine User: All GPS units lost the signal for approx. 18 minutes.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2023-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/10/2023
558 03/01/2023 South East Redmond, Redmond, WA Other User: Any given time. GPS is lost in the is area in different multiple smartphones. Also... compass shows wrong directions.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. User was sent data mapping information. Currently no additional information. 		Mapping Issue 05/10/2023
557 02/09/2023 Marine Users: GPS units Leica MXMarine MX-420 and SIMRAD MX-610 loosing signal at 12:15LT( UTC -3) every day (this is happening in Santos,Brazil area and subject to calls can be different time but each call usually issue will be at same time) and restoring in about 1-2 minutes. -On 08/02/2023 at about 23:30LT (UTC – 3) it was suspected that GPS signal was intercepted/jammed. GPS unit indicated high accuracy and no alarms but same time GPS position had been changing 300 with speed 86kn during anchor stay.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/10/2023
555 02/08/2023 JIZAN PORT Marine USER: The disruption was intermittent from 08:50 LT to 10:37 LT. A total of 8 times.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-010-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 02/15/2023
553 02/06/2023 Caofeidian / China Marine USER: GPS alarm 212: Loss of Position

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-010-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 02/15/2023
554 02/06/2023 WURTSBORO NY Other USER: All 3 devices show a lost of GPS signal from 12:39 to 12:57 PM, was at an elevation of 1300 ft clear view of sky

NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Currently no additional information.		 Insufficient Information 02/15/2023
549 01/03/2023 Oklahoma City to San Antonio and SW Texas Aviation USER: Interference in this area was displayed on the website GPSJam.org for the period 3 January 2023 to 6 January 2023. No interference was displayed for 7 January.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Was determined that there was no known interference to GPS users. 		Insufficient Information 02/15/2023
546 12/10/2022 Lehigh Acres Law Enforcement USER: On 12/10/2022 we experienced degradation of GPS signal quality reported by multiple devices across the US covering multiple time zones (Eastern, Central, Western). Main areas/States affected were FL, West Virginia, Arizona, Texas, New Mexico. The occurrence began around 7:30AM Eastern and ended around 7PM Eastern. This displayed itself as unusually consistent drift or multipath behavior where there is a lot of point scatter also loss of GPS signal altogether.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Currently no additional information.		 Insufficient Information 02/15/2023
544 12/09/2022 Strait of Hormuz Marine User: GPS signal appears to be jammed in Strait of Hormuz. At the time of reporting, other vessels navigating in the area were reporting the same issue with GPS.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-010-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 01/18/2023
543 12/08/2022 Strait of Hormuz Transportation User: Vessel underway, approaching to strait of Hormuz, outbound. Signal lost on both GPS for 1hr 32min.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-010-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 01/18/2023
541 11/30/2022 Arabian / Persian Gulf, Strait of Hormuz Marine USER: The GPS signal lost occurred on November 30th, 2022 between 0212 UTC and 0324 UTC while the vessel was on approach to the Strait of Hormuz, within the Persian Gulf waters (the vessel's position: 26 17N / 055 56E to position: 26 29N / 056 15E). The similar issues with the GPS disruption were being reported by other merchant vessels in the vicinity of the position.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-010-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/06/2022
547 11/27/2022 Suape Port, Brazil Marine USER: On 27 November 2022, at approximately 0000Z, Experienced loss of signal on their GPS Navigation system while transiting through rainy weather off the coast of Brazil. Ship's technician inspected the antennas and found them to be in good standing. Signal restored once clear of rainy weather. Issue occurred once more upon leaving Panama, rainy weather effected GPS signal, but signal returned after weather had cleared. Company provided a technician to inspect issue upon vessel's arrival in New York.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-010-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 02/15/2023
537 11/18/2022 Woodbridge, VA Automobile USER: Location data showed a 1/4 mile offset from actual position across 3 map applications on my phone and the same offset was shown on my vehicles factory navigation map. It occurred for roughly 25min then corrected itself.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Currently no additional information.		 Insufficient Information 12/06/2022
540 11/18/2022 Mersin, Turkey Transportation USER: While vessel arriving Anchorage Mersin, Turkey ( EAST MEDITTERANEAN ) Both GPS 1 & 2 Lost its signal for about 12 minutes. Even after arrival notice that we are losing the GPS signal about 10 times a day for up to 15 mins. All navigational equipment got affected during signal lose. Vessel informed VTS in the area, They advised to navigate with caution. All vessel in the vicinity were also experiencing with the same issue.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/06/2022
536 11/17/2022 San Francisco, CA Law Enforcement USER: Been experiencing GPS issues putting 5 miles and not acting like a glitch but with a reception of interference from other sources. USED FLIR and noticed non thermal anomaly being directed from the A band from 45NE.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Currently no additional information.		 Insufficient Information 12/06/2022
535 11/14/2022 Elon, NC Other USER: Our drivers for Paramount Logistics consistently have outages in the Graham/Burlington/Elon College area. As far as we can tell it is near completely random what is causing it- we are unsure what the issue is but it makes deliveries near impossible for some drivers as they need to use Scanner device as their navigation tool. Without this, they are unable to deliver or even scan in packages when they arrive, leading to a few issues. The scanners will lose signal, some restarting themselves due to lack of signal and others completely shutting off.

NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Currently no additional information. Recommended that there may be a reception issue in the area.		 Insufficient Information 12/06/2022
534 11/08/2022 Township, NJ Automobile User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Currently no additional information.		 Insufficient Information 12/06/2022
533 10/25/2022 California on I15 Automobile USER: For a period of about 30 minutes, I experienced my reported location moving in a circular path around my actual location. I had two GPS units performing navigation at the time - both units showed the same deviation in position. I rebooted the phone during the incident and it did not change the behavior. After about 30 minutes, performance of both systems returned to normal.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports or additional information from inter-agency partners or users.		 Insufficient Information 12/06/2022
530 10/16/2022 Independence Automobile USER: My mapping services are constantly searching for GPS in the Kansas City area. The Uber app and Google Maps cannot be used with any accuracy because of the GPS disruption.

NAVCEN sent data mapping information.		 Mapping Issue 10/25/2022
528 10/06/2022 Dallas, TX by Southern Methodist University Other USER: For several years now, on and off throughout the week, the area in an approximately 1 mile radius of the provided coordinates experiences GPS disruptions, especially during the afternoon. When these disruptions occur, my phone (two different models) and in-car unit are unable to locate where I am, with the application constantly changing my location on the map, or incorrectly identifying where I am. However, as soon as I exit the problem radius, all issues stop and my mapping applications are able to locate me again. This occurs whether I am using my cell phone independently, or using my car unit in my car has its own GPS antenna which is mounted at the top of my windshield)

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users.		 Insufficient Information 10/25/2022
605 09/25/2022 Marine USER: Vessel STONINGTON EAGLE Reported loss of GPS Signal on all receivers at 15:00 UTC SEPT 25 on approach to Suez canal
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/02/2023
527 09/17/2022 Navy Yard, Washington DC None USER: Our car navigation system and our mobile phone's GPS (Multiple navigation apps), both mine and my wife's, all indicated loss of GPS signal intermittently over the course of 50 miles from Washington DC I-295 through Harford County I-95.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users.		 Insufficient Information 10/25/2022
525 09/10/2022 Chicago Automobile USER: Both my standalone gps and phone gps report no signal in a usually strong area.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. No response for additional information. 		Insufficient Information 10/25/2022
524 09/07/2022 I-20 near Columbia, SC Automobile USER: Several times, most recently yesterday, when traveling on I-20 in Columbia, SC in car nav system stops working- screen goes blank, then tries to reset. Map will reappear, but without street names or landmarks, then resets again. This continues until east or west of Columbia, at which point nav system will return to normal operation.

NAVCEN sent data mapping information. 		Mapping Issue 09/13/2022
521 09/01/2022 Mesaieed Main Ship Channel Marine USER: At 1651 while transiting Mesaieed Main Ship Channel the No.2 GPS began showing erratic speed indications (28Knots vs 11.5KTS actual) then the receiver lost its fix. We switched to No.1 GPS. At 1653, No.1 GPS lost its fix. Both GPS units remained out from 1653-1659 (no speed/position data). At 1659 No.1 receiver acquired a fix. At 1701 the No.2 GPS got its fix back. Both screens displayed "NO FIX" during this time.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 09/13/2022
523 09/01/2022 Porter Ranch Automobile USER: GPS is positioning vehicle 200-300 feet east or west of actual location in the Los Angeles area.

NAVCEN sent data mapping information.		 Mapping Issue 09/13/2022
522 08/31/2022 Caofeidian anchorage / Bohai Sea – China Marine USER: 31.Aug.2022 / 1327 - 1333 UTC. GPS SHOWS VESSEL'S SPEED BETWEEN 0 - 95 kts JUMPING UP AND DOWN. GPS POSITION INFO RAPIDLY CHANGING AND SHOWN IN RED COLOR. 2 TYPE OF ALARMS ARE RECEIVED: 1. ALARM NO 212 "LOSS OF POSITION" 2. ALARM NO 210 "HDOP EXCEEDED" 09.01.2022 / 1710 - 1720 UTC: NO ALARM INDICATION BUT POSITION IS JUMPING ABT 0.08NM

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/25/2022
575 08/23/2022 Cordova, AK Surveying USER: Conducted 9 hour static observation of tidal benchmark "945 4050 TIDAL 13" as part of the annual survey. The observation began at 8/23/2022 16:40 UTC and the GPS data appears normal until about 8/23/2022 19:00 UTC, at which point the signal was severely degraded until about 8/23/2022 21:30 UTC. The signal was again degraded to a lesser extent from 8/23/2022 22:15 UTC to about 8/24/2022 00:10 UTC. The resulting GPS position solution did not meet the minimum accuracy specifications for the annual tidal benchmark survey. A repeated survey conducted on 8/27/2022 did not show any issues and easily met the minimum accuracy specifications.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. No additional information. 		Insufficient Information 06/22/2023
519 08/18/2022 Cartersville Georgia Transportation USER: Tractor trailers on coming in a residential neighborhood.

NAVCEN sent data mapping information to report unauthorized vehicle traffic. 		Mapping Issue 08/23/2022
595 08/18/2022 None USER: Gps isn't working appropriately and hasn't been for a while (fix it)! Seems to be THE difference between being in town (racing, etc) "or" not!
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 08/21/2023
518 08/17/2022 KAMSAR, GUINEA, WEST AFRICA Marine User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 08/23/2022
520 08/17/2022 Panama City, Panama Aviation USER: During departure from the Tocumen International Airport (MPTO), climbing through approximately 400 feet AGL, the aircraft lost all GPS guidance. GPS signal was normal on the ground. It was not lost until airborne. GPS guidance on iPad's was still available. It only affected the aircraft system. The pilot returned to base and the GPS unit was replaced. On departure, it occurred again. The pilot returned to base and shifted to a different aircraft. On departure it occurred again. Speaking with the avionics shop, this issue was affecting all aircraft in the area, including airline traffic. The loss of signal seems to occur within a radius of approximately 40nm, centered somewhere within Panama City or the canal zone. This occurrence first took place Wednesday, August 17, and is ongoing.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. Inter-agency partners confirmed known GPS interference in the area.		 Unknown Interference 09/13/2022
517 08/15/2022 Santa Clara, California. West of Bracher Park Transportation USER: I go buy a specific block in my neighborhood where my GPS tends to get disrupted or blocked. I have screenshots and maps of locations of the area where GPS is being blocked by something. It has been this way for a few months. Both my GPS watch and a GPS Testing app on my phone report issues when entering the area listed above. On the app, I had 38 satellites in use connected and it dropped to 12 in the dead zone. I suspect something in the area is disrupting GPS tracking as it's an open neighborhood next to a park.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. No response to request for additional information.		 Insufficient Information 10/25/2022
596 08/08/2022 Other USER: Multiple media reports claim GPS outages at the exact time fires were burning and people were trying to locate alternate evac routs.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Other 08/21/2023
592 08/05/2022 Marine USER: 2200LT (1900UTC)/ 05th August 2023 Vessel anchored W9 anchorage Adabiya City (Adabiya Port), Egypt. The vessel's GPS ringing alarm due to EPFS Error (Emergency Position Fixing System Error). The Suez pilot informed 05th to 06th August, the Suez area GPS jammed and was interrupted by unknown causes. Vessel does not use GPS position and then alongside at Adabiya port (1406LT/1106UTC / 06th August). At almost the same time vessel GPS was back to normal condition.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/07/2023
515 08/02/2022 Cumberland Gap Automobile USER: Our car navigation system and our mobile phone's GPS all indicated loss of GPS signal intermittently over the course of 10 miles.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users.		 Insufficient Information 09/13/2022
514 07/30/2022 Straits of Hormuz Marine USER: Vessel experienced GPS outage while transiting Hormuz Strait West bound .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 08/23/2022
713 07/29/2022 Suez Canal Marine USER: At 0110 LT dgps failed in posn. 27-14.7’N and 034-17.4’ E and restored at 0140LT in posn. 27-13.46’N and 034-18.6’E. vessel exit tss in gulf of suez south bound red sea.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/05/2024
711 07/22/2022 GULF OF AQABA Marine USER: Vessel was enroute to Aqaba, Jordan when GPS Jamming happened in Gulf of Aqaba.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 07/29/2024
512 07/22/2022 Fontana, CA Automobile USER: Google maps and Garmin satellite reception are continuously being interrupted

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users.		 Insufficient Information 08/23/2022
588 07/21/2022 Marine On July 21st 2000, Lat 31-14.3N 032-20.9E, MT Badlands Trader, IMO #9700483, transited northbound out of the Suez Canal. Upon departing Suez Canal, a loss of satellite connection caused both GPS units to fail. The vessel was equipped with 2 JRC JRL-7880 GPS units. Each unit is connected to its own antenna and can support all bridge equipment. Both units struggled to regain a fix while moving at 10 kts. The satellite display on the GPS contained 1-3 satellites instead of the average of 10. GPS positions arrived once every 3-5 minutes. The vessel safely navigated the next 30 miles using radar and intermittent GPS fixes. Loss of GPS Affected: • AIS through the loss of Course Over Ground (COG) vector. • ECDIS placed in deduced reckoning (DR) mode to maintain cross track distance and enable safety frame. • Wheelhouse Alarm Panel (WAP) All-call activated. • Radars with date, time & GPS input. • Gyro compass Auto-Latitude input. The loss of signal at the mouth of the Suez Canal forced the Badlands Trader to proceed onwards. The bridge team worked together to escape the dense traffic. Upon emerging from traffic, priority shifted to diagnosing the source of GPS loss. While departing the Port Said Traffic Separation Scheme at 2200, 31-34.3N 032-11.7E, the Badlands Trader called the tanker Violando, IMO # 942985, on channel 16. Violando reported they had GPS problems as well. 5 other unnamed vessels joined in the radio call to confirm their GPS failures. By 0100 July 22nd, Lat 32-01.5N 031-35.6E, the crew optimized the GPS settings to latch onto the growing number of satellites. Both GPS units regained steady fixes. We attribute the loss of GPS to a local loss of signal. Maneuvering delayed the re-acquisition of signal until more satellites became available. Both GPS units continue to fix. The crew will perform position checks against radar ranges and bearings upon sight of land this evening.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 07/31/2023
589 07/21/2022 Marine USER: On July 21st 2000, Lat 31-14.3N 032-20.9E, MT Badlands Trader, IMO #9700483, transited northbound out of the Suez Canal. Upon departing Suez Canal, a loss of satellite connection caused both GPS units to fail. The vessel was equipped with 2 JRC JRL-7880 GPS units. Each unit is connected to its own antenna and can support all bridge equipment. Both units struggled to regain a fix while moving at 10 kts. The satellite display on the GPS contained 1-3 satellites instead of the average of 10. GPS positions arrived once every 3-5 minutes. The vessel safely navigated the next 30 miles using radar and intermittent GPS fixes. Loss of GPS Affected: • AIS through the loss of Course Over Ground (COG) vector. • ECDIS placed in deduced reckoning (DR) mode to maintain cross track distance and enable safety frame. • Wheelhouse Alarm Panel (WAP) All-call activated. • Radars with date, time & GPS input. • Gyro compass Auto-Latitude input.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 07/31/2023
511 07/18/2022 CA-89 N from Tahoma to Truckee and then I-80 W Automobile USER: For most of the drive from Tahoma to Truckee to San Francisco, our position was being reported by the GPS as being roughly 200-500 feet away from our actual location which caused both nav system and Google maps directions to continually recalculate directions because it did not think we were on either CA-89 or I-80. While we were on I-80, the reports were generally south of our location although there were some occasions where it was reported north (generally it seemed having trouble determining our exact latitude). Occasionally, the GPS would briefly report our current actual location and then it would drift off after a few minutes. The disruption lasted from 9pm PDT when we left Tahoma to 1am PDT when we arrived in San Francisco. It was the first time in years of using GPS nav systems that I observed any errors. It was also very strange that this lasted for hours.

NAVCEN: No correlating reports from other users, sent data mapping information. 		Mapping Issue 08/23/2022
587 07/17/2022 Marine USER: The unit worked fine in July 14 but would not work on July 17 and still won’t work today, July 18. I have several of these Sitex units and antennas and I’ve tried all of them but can’t get a signal/GPS reading.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		User Equipment 07/24/2023
508 07/03/2022 Auburn, MA Transportation USER: All online mapping services were unavailable. Tried multiple websites and apps on several devices. Other vehicles in the vicinity had similar issues.

NAVCEN No correlating reports. Sent data mapping information. 		Mapping Issue 08/23/2022
507 06/25/2022 Crawfordsville, Iowa Communications USER: The satellite radio does not work and the map location is off by a few hundred feet.

NAVCEN Recommend contacting service provider for satellite radio if it does not correct itself, no reports from other users.		 Insufficient Information 07/06/2022
706 06/21/2022 San Antonio, Texas Automobile USER: GPS was looking like my car was doing donuts on the freeway the entire way from point A to point B. Was also asking me to make turns every second the entire way.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Mapping Issue 07/01/2024
506 06/15/2022 Mediterranean Sea ( North of Libya & south of Greece ) Marine USER: Both GPS no. 1 & no. 2 alarm keep coming, screen show's 'GPS LOSS OF POSITION' & GPS No. 1 screen show's ' AUG 17, 19 00:00 (U) WARNING RECTIFIED, GPS LOSS OF POSITION" , Vessel called other ship in vicinity and asked regarding the status of their GPS, same problem that they are facing with their GPS, GPS alarm keep coming for about 1hr, @ about 15 Jun 2330 UTC / 16 Jun 0130 LT, both GPS become stable.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 07/06/2022
505 06/14/2022 Gulei Marine USER: "No Fix" displayed on screen

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 07/06/2022
510 06/13/2022 Abu Musa Island Marine Merchant ship departed Das Island and was outbound Strait of Hormuz. Ship informs as they approached Dubai area they experienced loss of GPS signal. It took 4 hours before signal was back. Ship reports other ships informing on VF 16 channel that they too have lost GPS signal. Ship informs losing GPS signal in all systems and receivers (GPS, Sat C, Satellite Log, AIS). GPS signal would come back for a minute however it would show wrong location and back at Das Island. Ship informs total of 4 hours experienced without GPS. All GPS issues started 2 hours before passing ABU MUSA Island and 2 hours after passing ABU MUSA Island.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 08/23/2022
622 06/12/2022 Timing USER: For several hours we observed intermittent position changes (as high as |0.0012|) to multiple stationary GPS receivers. We are wondering if there was a known issue in the area at this time and/or if any other users reported similar failures. Any help would be greatly appreciated.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/13/2023
685 06/10/2022 Caldwell, Idaho Agriculture USER: As solar flares began to hit earth GPS guidance became inaccurate and would continually change the location of where machine was. Will the GPS service most likely stay inoperative until the planetary k-index levels decrease? GPS system also started disconnecting auto-steer automatically and showing a satellite reception error.
NAVCEN: Space weather was reviewed and found likely to have impacted GPS performance. NOAA Space Weather Prediction Center reporting Extreme (G5) Conditions observed 11 MAY 2024		 Other 05/13/2024
700 06/10/2022 Elon, NC None USER: This has been an ongoing issue where delivery drivers with the most frequent being Walmart Store to Home delivery drivers GPS units directing them to Old NC Highway 87 in Elon, NC
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 06/17/2024
660 06/09/2022 Marine USER: Vessel was enroute to Aqaba, Jordan when GPS Jamming happened in Gulf of Aqaba.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 04/08/2024
671 06/09/2022 Marine USER: Coast Guard Sector New Orleans received multiple reports of GPS anomalies from multiple vessels in the Lower Mississippi River around 0145 local time. See Narratives: At 0458 local on 05APR24, the SCC RCVD notification from the Panamanian flagged Bulk Carrier NAVI STAR reporting a GPS discrepancy on board the VSL. At 0145lcl on 05AP24, the GPS O/B the VSL was malfunctioning and going to multiple POSN regardless of the actual POSN it was in R/S also reported other VSLS within the same location, including the US Dredge GLENN EDWARDS, experiencing the same discrepancy. At 0145 local on 5APR24 SCC NOLA received notification from the pilot onboard the XIN AN NING, a Chinese Flagged Cargo ship loaded with grain, of an equipment failure IVO LMR MM 37. The pilot reported the GPS receivers and radar screen going out intermittently since approx. 0139 local.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/08/2024
678 06/09/2022 Communications USER: GPS communication interruption frequently around 7am local time (+3). In the early morning GPS are up and track up to 6 sats
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 04/22/2024
684 06/09/2022 Bangalore, India Automobile USER: No Comments Submitted
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Insufficient Information 05/13/2024
689 06/09/2022 London, United Kingdom Transportation USER: During all the AM Olympic City had no satellite connection. On reaching M4 the connection restored. 25.5 @ 9am. There was also intermittent problem the day before PM
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/10/2024
697 06/09/2022 Port Said, Egypt Marine USER: Started at provided time/position and spoofing continued to Port Said all the way to anchorage. Started as intermittent but then had completed GPS signal loss for about 4 straight hours on approach to Port Said, Egypt.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/17/2024
699 06/09/2022 St. Louis, MO Automobile USER: I live On Savannah Ave., St. Louis, MO 63131 issue I've talked to the truck drivers they keep turning around in our driveways because their GPS is showing this is a dead end street. It is not a dead end street it goes West on Savannah South on Princess then you can go east on Arthur it goes all the way around the block back to Dwyer every truck driver I talked to says it shows it's a dead-end street can this be rectified?
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 06/17/2024
702 06/09/2022 Kodiak, AK Automobile USER: Satellite compass is receiving only one satellite, and will not output a heading. Antenna and processor unit are functioning properly. Issue seems to be with the GPS signal itself.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 06/26/2024
707 06/09/2022 Svetlogorsk, Russia Marine USER: M/V ARC Integrity (MMSI 9332949) commercial car carrier enroute to Kemi, Finland experienced an episode of GPS "spoofing" in position LAT 55-49.1N LONG 016-59.6E while roughly 80 nm from Russian territorial waters. We lost all GPS/AIS data around 0200UTC and then continued to intermittently lose data or have faulty data coming from our GPS units until around 0900UTC. While this was occurring we spotted a Russian naval vessel on our stern who hung around in our visual area for a couple hours, CPA of 5 miles.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 07/29/2024
708 06/09/2022 Norfolk, VA Marine USER: LaBelle 542 at buoy 10 and inbound loss of ECDIS and GPS nav
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 07/29/2024
719 06/09/2022 New York, NY Communications USER: Experiencing frequent jamming and delays to all forms of correspondence.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 08/26/2024
726 06/09/2022 Rochester NY None USER: Route 390 and 490 GPS INSTRUCTIONS ARE VERY BAD. Roads too close to each other. I go there every day. Everyone is confused. Can you zoom in better?
NAVCEN: Provided user information for help with address, route, and map problems in GPS devices and apps.		 Mapping Issue 09/09/2024
745 06/09/2022 Miami, FL First Responder USER: my daughter traveled to Miami and attacked by an alligator due to her place going down with another person's intent and malice.
NAVCEN: No additional information.		 Other 10/07/2024
750 06/09/2022 Yanbu, Saudi Arabia Marine USER: Kindly note that we experienced a GPS disruption/loss of signal today, 04 October 2024, at 08:30 LT (GMT+3). The disruption is still ongoing while the vessel is engaged in cargo operations at Yanbu port.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/07/2024
755 06/09/2022 Yanbu, Saudi Arabia Marine USER: The disruption is still intermittent
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 10/14/2024
526 06/09/2022 NE Washington, DC Other USER: I was using the Phone for navigation in Google Maps. I was mid-route when the map suddenly showed my location as several hundred meters west of my true location. As I continued to drive, it appeared to get worse. I reset the device but it did not correct the problem. I checked my location in an alternate mapping program and it continued to display the wrong location. My phone’s software is up to date. This has never happened before. The problem appeared to resolve approximately 30 minutes later on its own, after I arrived at my destination. It’s unclear if my location was corrected because I was on wifi at my destination or if it’s because the gps issue resolved.

NAVCEN sent data mapping information.		 Mapping Issue 09/13/2022
529 06/09/2022 Elko, NV Automobile USER: Drove from Wells NV to Livermore CA. All three of my GPS units experienced major off-track (hundreds of feet horizontal) offset errors, and my GPS logger recorded +5000-ft to -2000-ft altitude errors. Speed was at times reported at HALF the actual speed. This was a MAJOR disruption recorded on three independent GPS units. The time and coords I report are for the greatest elevation error (reported me at 10000-ft altitude in Elko NV).

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users.		 Insufficient Information 10/25/2022
532 06/09/2022 Houston Other USER: Driving in the Houston area, my phone and vehicle are both reporting my location being miles from where I actually am.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports or additional information from inter-agency partners or users. 		Insufficient Information 12/06/2022
542 06/09/2022 San Francisco, CA Communications USER: I was using the gps and my elevation has been not showing the elevation and has been affected by local interference. I contacted the FCC, the source of the anomaly was producing high levels of static when dosimeter had been brought into direct contact and moved irregularity.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Currently no additional information.		 Insufficient Information 12/06/2022
545 06/09/2022 South of Hormuz Straits, North of Ras Al Khayma Marine User: Both Marine GPS units lost position and went blank basically with nothing showing in the Lat/Long fields. Rebooting the DGPS units showed it passing the Power On Self Test without error’s but they both still displayed a blank screen with an alarm of “No fix”. Our personal GNSS receiver still gave a GPS fix(satellite only), confirming the ship’s DGPS unit’s fix loss was not being caused due to satellite GPS signals but possibly due to jamming or scrambling of the differential signals. As both DGPS units were setup with “Auto” for most settings, this was changed to “GPS Only” mode to process only satellite signals & reject all SBAS & DGPS signals. The units were then re-initialized and this restored position fix data on them.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-010-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 01/18/2023
552 06/09/2022 Topeka, KS Transportation USER: Flying a DJI M210 V2 with RTK we encountered total GPS loss (RTK was not being used) at around 200 ft. Over the span of a minute, the number of connected satellites dropped from 12 to zero and remained at zero until landing. Although RTK was not on, system displayed an RTK positioning error, and an orienteering error.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Currently no additional information.		 Insufficient Information 02/15/2023
568 06/09/2022 Port Townsend, WA, USA Marine User: The primary and secondary GPS units on board appeared to lose connection with all satellites. Power cycling of the units did not solve the problem. Approximately 20min after the outage, the secondary unit maintained satellite connection and was able to provide position fixing, but the primary unit continued to experience a 'no fix' loss of position. After securing the vessel at the conclusion of the crossing, the secondary unit experienced a brief satellite connection interruption (<2min), in addition to a 'DOP' flashing on the screen. After approximately 1hr from the original connection loss, both units are now maintaining position fixes.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. .		 Insufficient Information 05/10/2023
573 06/09/2022 Communications User: The location in Google maps and other apps moves around even though I am not moving.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. User was sent data mapping information. Currently no additional information, operates as expected when moving. 		Insufficient Information 06/22/2023
580 06/09/2022 Elon, NC None USER: FedEx driver states that my address is showing up at a camper behind a Church. This is an ongoing problem & has resulted in loss of approx $1,000+ in property over the last year. Alamance County Sheriff's Office has documented property damage to Church awning in an attempt to deliver to wrong address & has refused to do anything or provide guidance.
NAVCEN: There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users. Address appears on google maps. User was sent data mapping information. Currently no additional information. 		Insufficient Information 06/22/2023
599 06/09/2022 Automobile USER: My maps will not show me in the correct location it just keeps jumping around a different locations. This issue has been ongoing for at least four days.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Mapping Issue 09/04/2023
601 06/09/2022 Automobile USER: Location tracking is constantly 50-150 yards off, rendering route planning useless (constant recalculations).
NAVCEN: Provided user information for updating equipment software.		 User Equipment 09/11/2023
611 06/09/2022 Transportation USER: There is still a misdirection to my address. Have someone call me and I will explain. NAVCEN: User provided link for assistance in updating mapping software. Mapping Issue 10/16/2023
613 06/09/2022 None USER: We are just looking for assistance in updating our actual address on all GPS systems. We've updated with google maps but it still doesn't seem to be helping.
NAVCEN: Provided link to GPS.Gov mapping information.		 Mapping Issue 11/13/2023
623 06/09/2022 Other USER:It’s been an on and off issue for about 2 years and is and obvious problem as it’s gotten worse. GPS location will jump erratically from the coordinates provided to New York New York, 40.701927, -73.923767 multiple times a minute after 7pm to 6am the next day everyday. I’m reporting this for multiple reasons. My fathers health is starting to decline in the event I call 911 I don’t want to end talking to a call center in New York. The millitary does fly directly over the coordinates provided which I know they use gps and them showing up in New York for a few minutes I could see being problematic. Lastly tinder the dating app is essentially useless aswell…..
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 12/13/2023
509 06/08/2022 Eastern Peru Aviation USER: On 6 occurrences over 90 minutes, GPS lost contact with all or all but 1 ( hard to tell if it was all and by the time I got to settings page, one had already reconnected ) Aircraft was tracking W and then NW between Puerto Esperanza and Pucallpa. On flight down in the morning, no anomalies notes. We have flown that route several times over the past month or more and had no interference issues. Same configurations, same frequencies, same aircraft. All reacquired within 30 seconds aprox. Hardware showed no signs of error and cabling/antenna checked out.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/25/2022
639 06/08/2022 Marine USER: The vessel Overseas Sun Coast (IMO#: 9862944) is anchored off of Corpus Christi, TX. Our tracking software Navtor Navtracker correctly shows the vessel's position. The website vessel finder https://www.vesselfinder.com/ (which some of our customers use) shows the vessel in Oregon.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Mapping Issue 01/26/2024
734 06/08/2022 Suez Canal Marine USER: After exiting the Suez Canal, the GPS position was lost and indicated that we were in Jordan. The vessel was on the route from Port Said to Alexandria. It was around 2230 LT when the GPS stabilized, showing the start correct position at 31-58N/03-58E.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/16/2024
735 05/30/2022 Suez Canal Marine USER: Loss of GPS
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 09/16/2024
501 05/28/2022 ISKENDERUN/MERSIN BAY Marine USER: On 28th May 2022 at 1940Z during trading in ISKENDERUN/MERSIN BAY was noticed that GPS signal totally lost from (GPS1 & GPS2) simultaneously and all the integrated equipments alarming due to position lost.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 07/06/2022
663 05/27/2022 Surveying USER: Topcon Surveying equipment is not working on our customers jobsite. Trimble Surveying base and rover is working. Old Topcon hardware will only track GPS and zero GLONASS. Newer Technology Topcon Hiper VR Rover and MCi4 controller (which can track all satellites) in the machine will immediately lose satellites in areas on half the site and in a certain direction towards buildings in the area. Tested all surrounding areas with rover driving around in my truck. I made a google earth map indicating satellites working and not working. Possibility the signal is coming from one of these buildings. Ball Aerospace, Brocade Communications Systems, EPK Solutions, CACI (previously LGS Innovations), Coalfire, or Trimble Inc. Areas that are working I am seeing 24 to 30 satellites as usual.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information.		 Unknown Interference 04/08/2024
500 05/26/2022 tehran Timing User: Time and date change via GPS signals.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users.		 Unknown Interference 07/06/2022
499 05/23/2022 toledo, ohio Communications USER: 16000 H.D.P/8000 H.D.P./MISSING TIME/ -110 METERS ELEVATION/-300 METERS ELEVATION/ALL FROM MY HOME AT 2755 WORTH ST.OREGON,OHIO. AT 01-31-2020. AND OTHER DATES.AT PERRYSBURG MUNICIPAL COURT, PERRYSBURG OHIO.POSSIBLE UNDER GROUND COMMUNICATION CABLE.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users.		 Insufficient Information 07/06/2022
576 05/21/2022 West Finley, PA Other USER: About nine riders were using portable GPS units to navigate a preset bicycle route. We rode between 10:00 AM and 3:00 PM. During the ride (at many points with a clear view if the sky) all of us were unable to get GPS fixes on our location or were getting located at points as far away as 6 miles from our actual location. The units were generally acting erratically during the majority of the ride. Because essentially all of our units were not operation properly at the same time and we were in an area where we have always had reliable GPS reception, we suspected maybe part of the satellite network was not operating correctly.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. .		 Insufficient Information 06/22/2023
496 05/18/2022 Navra, Estonia. Other USER: Multiple Receivers. Overall low accuracy within 18km of border. Position accurate to only ~1km. Accuracy improves on the ground as distance from Narva increases.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners or users.		 Unknown Interference 07/06/2022
497 05/18/2022 Port Said - Egypt - Outside Channel User: Vessel has 2 DGPS/ and experienced GPS Jamming / Spoofing being done by local authorities in Egypt on regular basis on selected area basis location. Till the time the Canal pilot is there, there is no spoofing, once the pilot disembarks in the channel, the spoofing starts and continues till the time vessel is in the Egyptian waters. same is experienced when vessel is trying to join the Port Said Channel - from anchorage area till channel the spoofing is there, once the vessel enters the channel the GPS jamming is not there. There are no issues with the Make/Model of the GPS, the spoofing is there for all models and is common on most of the ship as discussed with other vessel at the time of joining the Channel - most ships had this issue. Also discussed with Suez pilot, and as per them, spoofing is done by Military.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/25/2022
495 05/15/2022 Belgrade USER: After 35th Belgrade marathon many users reported their distance measured incorectly, with few hundred meters added to officialy certified length of half marathon and marathon tracks.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. 		Insufficient Information 05/25/2022
494 05/13/2022 Near Suez Canal Marine USER: Interference occurred until entering Suez Canal, restored at position 31-27.8N / 031-02.1E

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/25/2022
492 05/08/2022 juaymah Terminal Marine USER: Intermittent loss of signal on 3 x GPS units fitted to vessel. Disruption was sudden and as vessel entered Juaymah SBM buoy field. Previously no problems during approach and anchorage.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/25/2022
683 05/06/2022 Clayton, GA Automobile USER: Several GPS users reporting intermittent inaccuracy issued in and around Rabun County Georgia. A variety of GPS devices experienced the same issue.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Unknown Interference 05/13/2024
491 05/05/2022 Sandia Crest ALBUQUERQUE Communications USER: issue is intermittent affecting the following locations. 35.216528 -106.452417 35.055278 -106.581667 35.088389 -106.616556

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were authorized GPS tests in the area, listed on NAVCEN webpage. No correlating reports from interagency partners. No response when NAVCEN followed up with the reporting source to see if the issue was ongoing.		 GPS Testing 05/25/2022
490 05/04/2022 Perryville Automobile Google Maps for address in Perryville, MD provides two locations one of which indicates an area that in not it is actual location. Marion Tapp Parkway in within the town limits.

NAVCEN sent data mapping information. 		Mapping Issue 05/25/2022
493 05/01/2022 Western north of iraq Timing USER: The disruption happened everyday approximately at 13:00 GMT+3. The devices start losing synchronization.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/25/2022
586 05/01/2022 Other USER: Please refer to right reference: New apartment building with the electrical company of Legrand. New bright electrical company (Vehicle) parked inside apartment complex parking lot may be a disturbance with signal interference. During move in, plugged Apple computer inside of the outlet, computer completely locked out by the apartment complex (blue screen). About a month ago, while leaving the fourth floor on my way to work, a disturbance with the outside deck doors, a group of people alterring the new changes made to the doors, a female who appeared in distress, racing towards the corner I just came from. One of who appeared to be a worker joined the elevator with me. Since then my electrical has been of constant talk of what appears to be that women. Removing security files as low as human health (CDC) range and internet security files. Due to tinnitus the ears are currently sensitive to electrical, so upon the disruption with the removal of files a quick gasp, ring, or clog of the body and brain show reaction.a feeling of hate coming from this women. Though the issue is the electrical or the bulk internet account has been hacked along with the signals of vehicles. Network time servers may not be according to where it first was established. The problem is radio has went viral and no one wants to report the hearing of viral to accept the discrepancies of the error. Currently my phone account is linked to Verizon which may have also been compromised and the administrator account of the energy account compromised and being abused. The servers are connected to a gps system along with the utilipro time server which helps the time clock of almost all warehouse time clocks record work time. The company name ukg and utilipro. During the end of last year a job position at the airport was accepted. During training a report made of an immediate pull or tug at my inner left ear, as if someone tried to close it out. Reported to SIDA with no response and the email deleted from the servers. Years ago a memorandum came from the Presidents' house of a breech, the connections of the whitehouse.gov may be apart of a re-route and the re-route seems as if it could be a terrorist. My original nasa live now being forwarded to /nasalive. I need to ensure the database of my history is being routed correctly and the safety continues to remain.
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Other 06/26/2023
489 04/30/2022 230 nm of the coast of Libya Marine USER: Vessel transiting eastbound through the Meditteranean Sea, 230 nm off the coast of Libya. GPS 1, GPS 2 & the GPS Compass lost the satellite signal. The Furuno GPS units showed "210 HDOP EXCEEDED.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/04/2022
488 04/29/2022 Tucson Arizona Other User: Mr. Paul Miron (JNWC) has received a report of malicious GPS interference around Tucson, AZ near Davis Monthan-Tucson Air Force Base. Mr. Miron is collecting additional information from reporting source.

NAVCEN: After investigation it was determined where the source of interference was coming from. Once the interference was secured the GPS signal was fully operational. 		Unintentional Interference 07/06/2022
487 04/18/2022 Chocolate Mountain Other USER: Unit acquired new in 2010, with no previous anomalies including during 24 hours of operation leading up to start time of problem. After 1.5 continuous hours recording a track (2 meter interval) with correct date/time, unit date/time changed from 2022-04-18 11:35:42 PST (GMT-08:00) to 1999-08-21 16:59:46. A few minutes later the date/time shifted again to 2002-09-02 11:38:24 PST (GMT-08:00) - correct time but incorrect date - and remained stable thereafter. Apparent week-number reversion in an older GPS unit, but the timing of the reversion seemed random and unexpected for the age of the unit. Signal interruptions and position anomalies up to 0.5 mile started at the same time as the first date/time change, and continued for several more minutes after date/time stabilized, despite being on an exposed ridgetop position with clear view of sky the entire time. Positioning stabilized at 2002-09-02 11:51:20 (true date 2022-04-18) with no further issues 24+ hours later, except for reverted week number (and after several power cycles).

NAVCEN: Provided reporting source information for manufacturer firmware update guidance to correct known issue. 		User Equipment 05/04/2022
485 04/12/2022 Mersin, Turkey, Anchorage #2 Marine USER: Vessel experienced both jamming, where the signal was lost, and spoofing, where the position was shown nearly 400nm to the north of actual position.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/04/2022
486 04/12/2022 city of belmont Communications USER: loses gps signal in this area for the past few weeks, gps location is inaccurate by at least 1000+ft. occurs on multiple devices on multiple apps.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. 		Insufficient Information 05/04/2022
484 04/10/2022 San Diego, CA (Fasihion Valley Mall area Automobile USER: GPS on automobile was not working from about 1:30 pm to 1:45 pm Pacific time in San Diego, WI. It just kept resetting and resetting and could not find its place. Thus continued for at least 10-15 minutes. Not sure if related, but unable to place cell phone calls to my husband at same time. When we go into truck he remarked that GPS has been acting weird and I said I had tried to call, but my phone would not allow me to place calls for same time period around 1:35 pm in afternoon.

NAVCEN: Spoke to the reporting source and determined issue was with service provider. Car GPS was not working because it was using the phone through the auto application. 		User Equipment 05/04/2022
482 03/30/2022 JIZAN CHANNEL , KSA Marine User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/04/2022
483 03/29/2022 Dunkirk Automobile USER: The GPS was confused; repeatedly gave inaccurate directions; would tell me to turn "right onto southern maryland boulevard, route 4, S" when that would put me into on-coming traffic. Did the same thing to turn left onto the same blvd going north; re-routed itself every few seconds; gave multiple directions, one right after the other. Would show the destination much farther away (EX: 6 hours and 11 minutes) when it reality it was about 20 minutes away. Repeatedly did this and kept changing the time to destination every few second. Verizon is my cell company. A friend traveling through Philadelphia yesterday (2.5 hours north of Dunkirk, MD) experienced the same thing. It was not just my phone or my area. Right now I keep having to re-enter the re-captcha code so your site is not working properly either.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. 		Insufficient Information 05/04/2022
481 03/17/2022 abt 70 Nm off-Iskenderun , Turkey Marine USER: All Navigational and Communication Equipments out of order. Found out now from Agents AT Port Iskenderun that other ships are also having similar problems in the approach - due to Military Jamming. Even now there are interruptions from time to time.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/04/2022
478 02/27/2022 Brussels, Belgium Other USER:I was driving on the highway, GPS under the windshield, good reception, suddenly 0 sats, after 9 minutes again good reception. A detailed log (ubx format, nav pvt protocol, 10Hz) is available

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. User encouraged to report the issue to the nearest communication authority. 		Insufficient Information 04/05/2022
477 02/22/2022 Ashkelon, Israel Marine USER: Disruptions began immediately after arrival at anchorage in Ashkelon, Israel. Intermittent, in that they come and go, with periods of hours of no disruption followed periods of nearly continuous failure of signal reception.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2022-005-Various GPS Interference and AIS spoofing. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/04/2022
476 02/21/2022 I5 north through Portland, OR Other USER: We were driving from just outside of Portland (OR) towards Seattle (WA) when GPS on the iPhone started misreporting the position. Rebooting device did not fix the issue. Switched to the GPS navigation in our 2021 Audi Q5, and it was also reporting an inaccurate position. Approximately 90-120 minutes later, the issue seemed to have resolved itself..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. No response to our request for additional information.		 Insufficient Information 04/05/2022
474 02/04/2022 Mersin Turkey Marine USER: all vessel GPS units stopped receiving a Signal and then the signal would default to 40N 40E. it has been off and on for 3hours now.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 02/09/2022
591 02/04/2022 Other USER: This is a bit of a unique situation. I believe someone has created a form of human receiver/antenna, possibly as an accidental university project that has been receiving unknown signals for the past years. These signals seem to be biotech based and hold a form of audio/video sensory. I believe they mimic that the static in the TV observing both white and black images at the time of interception. Whoever is doing it may have created a form of Faraday Cage and I fear that someone may have reported it as a threat to national security before I was aware of it. The timeline stems from 2020 - Present, with an incoming channel heard on a volume level as of Feb 2022
NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from inter-agency partners. No additional information. 		Other 08/07/2023
473 02/03/2022 Dammam port KSA Marine USER: At the time of disruption all GPS used on board was out of order for more than 4 hours.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 02/09/2022
472 01/29/2022 3685 US-61, Blytheville, AR Transportation USER: All three GPS devices stopped acquiring signal along route I-55 Northbound starting north of Jackson MS currently to Blytheville AR.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. 		Insufficient Information 02/09/2022
475 01/28/2022 sikeston Automobile USER: in southeast Missouri it shows GPS fail but it worked when i drove to north east Arkansas and quit working again when i got back in Missouri.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. No response to our request for additional information. 		Insufficient Information 04/05/2022
471 01/23/2022 Fuquay Varina Other USER: Mapping software is displaying an inaccurate location with up to a 130 ft error, variable. Typically the location with within a few feet. The error is not constant.

NAVCEN sent data mapping information. 		Mapping Issue 02/09/2022
470 01/21/2022 Aurora, Colorado Communications USER: Approximately 1530 on 21 DEC 22 two of our base transceiver systems began to lose sync. The GPS receivers, control cabling, and surge protectors were replaced with no change to loss of sync. There are no other BTS affected other than three sites in Aurora, Colorado, There is also problems with the local public safety P25 simulcast systems which have lost GPS lock in this area. Spok provides critical encrypted health care communications at these facilities.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. After further investigation from inter-agency partners the source of interference was identified and secured. 		Unintentional Interference 02/09/2022
516 01/10/2022 Mitchell, SD Automobile USER: The date & time are not working on my auto radio. I do have GPS on my vehicle. It set it back to 2002 at 12:24. I called the dealer a few times and they said it has nothing to do with the dealership or auto. They said it is because it's being put on satellite and they are working at getting all the numbers set right. Corp. said that Aug. 12, 2022 is when it should be fixed. That date came and went and it's still not working. Can you please tell me when this all should be straightened out? If this is not the correct place I should be talking to, can you inform me of who I should be getting ahold of. Apparently they are switching from towers to satellite for the autos. Vehicles that were built before 2012 is what it affected. I would really appreciate some kind of a response. I know nothing about the date or time it occurred. I just noticed one day it was way off and couldn't reset it. Thank you.

NAVCEN sent information regarding GPS Rollover issues.		 User Equipment 09/13/2022
467 12/26/2021 500 miles from NE Coast of Brazil Marine USER: On 26th Dec 2021 @ 2035 UTC, vessel noticed position fluctuating. Position verified using GPS2 on ship and found vessel position shifting by 2.5-3 cables automatically. And happened again on 27th Dec 2021 @ 1220 UTC with the same problem as yesterday. Presently vessel is using GPS with GNSS + SBAS option and was disabled the QZSS (Quasi-Zenith Satellite System).

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. 		Unknown Interference 02/09/2022
466 12/22/2021 Arcadia NSW Australia Automobile USER: Multiple devices showed incorrect location by approx 10km. Correctly showed movement through space.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. No response to our request for additional information. 		Insufficient Information 02/09/2022
468 12/21/2021 Empire Surveying USER: During the weeks of December 21 and 28, we had the time to fix was very long when there was even slight skyview clutter accuracy and repeatability were considerably degraded compared to anything done in the last 12 months. The problem seems worst at 1030 am till about 1 pm. Also on another site miles away where fixed position time was less but accuracy and repeatability were also degraded. All receivers were rebooted several times and firmware updates were checked to be current. These problems were consistent and unexplainable. It was like stepping back in time to GPS equipment a decade ago. Radio links were strong time delay showed a second. Only in the wide open did the receivers function as expected as far as time to fix but repeatability was still degraded. Lock in cluttered or wooded areas that we have repeatedly performed this past year were impossible with and we tried two different receivers that have performed amazingly well in the last 12 months. I tried turning off each GNSS constellation to see if that made a difference and I tried turning off one SV at a time to see if that made a difference. Nothing seemed to work. I also contacted the equipment rep and we went over all settings and he suggested I check firmware which we did. This problem exists on two separate systems working in two different areas about 30 miles apart. We even traded equipment one day, and the problems still existed. I have checked the Nanu reports and one sat was unusable till the 27th but we had the same problems after that. I am hoping this clears up but I am concerned.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. No response to our request for additional information. 		Insufficient Information 02/09/2022
465 12/16/2021 Odessa/Midland, Texas Automobile USER: GPS system indicated no GPS signal.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. No response to our request for additional information. 		Insufficient Information 02/09/2022
464 12/10/2021 Sao Sebastiao, Brazil Marine USER: Position shifts to bearing 039 T , 0.47 Nautical miles off actual position..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. 		Unknown Interference 02/09/2022
463 12/06/2021 Palm Beach Gardens, Florida 33410 Other GPS just went down 2310 Local or 0410 UTC. Still down. Cause of GPS data loss could be cloud cover or atmospheric weather related or local interference. Moved GPS ground plane around but no further improvement. Usually I receive at least 8 GPS satellites. Backup USB GPS also is down for my PC as well.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. User indicated operation returned to normal after weather in the area cleared up. 		Unknown Interference 02/09/2022
451 11/30/2021 Highway 70 Hot Springs, Ar Other USER: Sorry I can not provide details on what satellites were being tracked but as soon as I hit the coordinates above until I got to 34.49593400553349, -93.07499426473889 traveling through downtown I kept getting GPS signal "failed" messages and my location would shift in large jumps from half a mile to out of the city. I just wanted to give a heads up because KHOT Memorial Field Airport is parallel on that route. The route I took parallels RY 05/23.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. 		Insufficient Information 12/14/2021
450 11/22/2021 Ras Tanura Freighter anchorage Marine USER: We are having problem GPS signal losing “EPFS”. on our vessel. She is running up and down north of RTE-7 anchorage/east of tanker anchorage Ras Tunara Freighter Anchorage KSA . Please check and advise.In same area we have checked many vessels with the same problem..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 12/14/2021
447 11/14/2021 Limassol Marine USER: Full GNSS failure..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
446 11/07/2021 Moni Anchorage close to Limassol, Cyprus Marine USER: Ship is anchored on Mony anchorage, Area around Limassol is known for occasional short GPS interference.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
445 11/06/2021 Moni Anchorage close to Limassol, Cyprus  User indicated an intermittent problem that was otherwise unspecified. .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
444 11/05/2021 Limassol Marine USER: Complete position and speed failure of all gnss systems..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
469 11/05/2021 Brooklyn Other USER: The maps wont go to any locations or give me directions.

NAVCEN sent data mapping inforamtion. 		Mapping Issue 02/09/2022
442 11/04/2021 Marsaxlokk. Malta Marine User indicated an intermittent problem that was otherwise unspecified. .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
443 11/04/2021 Limassol Marine USER: Intermediate complete loss of position and increase of speed on all 3 GNSS - Issue is still on going..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
441 11/01/2021 Driving West into South Bend on I80 Automobile USER: Mercedes Sprinter van says no GPS satellite. My iPhone position keeps wandering off the route and then instructs me to “proceed to the route” then occasionally comes back on track before wandering off again.

NAVCEN: Requested additional information, but there was no response. 		Insufficient Information 12/14/2021
462 10/28/2021 San Diego CA, Providence RI, Baton Rouge LA Timing USER: We have GPS clocks deployed across the US. Across many of our GPS clocks, I am seeing a marked decrease in satellites being tracked. I have graphs that will show this, from San Diego, Baton Rouge, and Providence, but I am unable to upload images via this form. Throughout the 2021 year, the tracking has decreased from an average of 8 satellites to 5, and then occasionally drop lower, and we get alarms when we drop below 3. There was an instance that started on 10/29 to 11/09 that shows a more pronounced drop during that time period. Is this a known issue or are there changes being implemented that can account for this change?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. The fluctuations in the satellites tracked appear to correlate with several released NANUs. The user will continue to monitor the status as NANUs are released. 		Other 02/09/2022
436 10/25/2021 Istanbul Strait / Marmara Marine USER: After dropping anchor at Istanbul anchorage, vessel reported both GPS outage. Same failure notification from many ships.Istanbul anchorage area there are some frequency interceptions for temporary..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
437 10/22/2021 Mapleton, ND Surveying USER: No satellites tracked on LED panel, and in the receiver utility. Static files from same time will process fine on OPUS. We have video of the behavior, and screen shots of the software screens. Manufacturer cannot explain the behavior, they should not act like that, especially all the receivers on the same job at the same time. This location is well south of the Northern Plains UAS test site. We have no idea what was in the air at the time of the incident.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. RS is working with manufacturer.		 Insufficient Information 12/14/2021
440 10/20/2021 I65, Alabama, mile marker 312-317 Communications USER: I travel this section of interstate regularly. I would say 50% of the time I loose GPS in this stretch. It started about a month ago. A couple of weeks ago I saw workers working on the microwave towers in the area but those were installed a couple years ago with no issues so not sure what has changed in this short five mile section.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. 		Insufficient Information 12/14/2021
434 10/18/2021 North of Dubuque, Iowa in a 3nm radius of John Deere Plant Aviation USER: ADS-B locating problems.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. No response to our request for additional information. 		Insufficient Information 12/14/2021
433 10/13/2021 Istanbul Marine User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
432 10/12/2021 Phoenix Surveying USER: The surveyor worked in the same area with GPS a week prior. This morning and afternoon the equipment could not receive NavStar satellites. A few GLONASS and Beidou satellites were seen.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. No response to request for additional information.		 Insufficient Information 12/14/2021
431 10/11/2021 Limassol Marine USER:Speed and position draticaly changimng on all GNSS systems for an aprox duration of 5 mins. The interference in currently on going.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/19/2021
430 10/08/2021 Limassol Marine USER: 2 of our 3 gnss systems have been intermitently using 0 satellites while tracking upto 22 GPS and glonass. the issue is still on going at this time.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/19/2021
438 10/07/2021 Istanbul Aviation USER: I suddenly had an incorrect GPS signal, the home point was moved by several hundred kilometers. My drone then started moving in the opposite direction by itself. I am very confident that this was GPS spoofing by somebody trying to hack and take control of my device..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. There has been an increase in reports from users in this region.		 Unknown Interference 12/14/2021
429 10/04/2021 East of Cyprus Marine USER: During Disruption of GPS signal, as per GPS manual (Alarm 001 - 'NO FIX') appeared on GPS display and remain the whole time until GPS signal restored. GPS SIGNAL was restored satisfactory (after one hour)..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/19/2021
428 10/01/2021 Central Poland Other USEr: About halfway through the flight the number of satellites seen by the sonde started dropping. When it got to 6, it started giving timestamp errors. It then started sending out invalid GPS coordinates ie. coordinates in Belarus and altitude below sea level. This same thing happened with another meteosonde a few 100km south in Slovakia a couple of minutes later. After a few minutes of showing coordinates over Belarus and impossible altitude, the satellite count went up and normal coordinates resumed. I believe this is not a sonde malfunction since it happened with two different, independent sondes at the same time, hundreds of km apart. Other telemetry from the sondes were normal. More info here: https://github.com/dl9rdz/rdz_ttgo_sonde/discussions/204 https://www.ebski.co/2021/10/01/r5020799/.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. Reporting source provided data plots that appear to be similar to other documented interference events occurring at or near airports in the region. 		Unknown Interference 10/19/2021
427 09/25/2021 Approaches to Tripoli, Lebanon Marine User: One of our company managed vessels, at the time of her approach to the port of Tripoli, Lebanon, experienced erratic behaviour on her various navigation equipment. Both the GPS installed onboard lost satellite signals. The gyro compass started showing an error of around 14 degrees. The vessel route on the ECDIS disappeared, the ECDIS started giving numerous alarms, and the tracked positions on ECDIS, as received from GPS feed, started jumping in all directions. All the equipment stabilized as soon as the vessel entered port limits, but similar erratic behaviour of the navigation equipment was observed during the vessel departure.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/19/2021
425 09/24/2021 Fortaleza Anchorage,Brazil Marine USER: Vessel at Fortaleza Anchorage. Vessel noticed position fluctuating on the ECDIS. Position verified using GPS2 on ship and found vessel position shifting by 6-9 cables automatically. Presently vessel is using GPS 2 for navigation and out to all devices on the bridge.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. 		Unknown Interference 10/19/2021
426 09/22/2021 Fayetteville Other User: For the past several days randomly anytime in downtown Fayetteville for some reason GPS just loses all signal I noticed it whenever my navigation both Google Maps and Waze and Uber and Lyft would seem to be confused as to where I was located exactly I also check the GPS location shown in my vehicle and for some reason it sometimes shows the correct coordinates but sometimes it just shows 1016.66667 , 1016.66667. I am not sure if the issue is corrected by distance or time but it seems more like it corrected by distance.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. 		Insufficient Information 10/19/2021
424 09/20/2021 Limassol bay Marine User: Both GPS position lost 11 satelites tracked non used. A common occurance here in Limassol bay.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-010-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 12/14/2021
422 09/19/2021 Cyprus Marine User: Since September 3rd we have had an increasing number of our ships reporting GPS position issues (unable to get a fix for several minutes or hours) in the area South of the Island of Cyprus in the Sea area. Are you aware of these issues ?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 09/29/2021
420 09/09/2021 Limassol Marine User: Sateliets were tracked but not used,Deferential corr. was blocked.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 09/29/2021
416 08/18/2021 Bedford, UK Other User: Vertical data lost accuracy. Reported altitude changed from 20m ASL to -217m ASL and returned to 20m ASL over a period of 15 minutes. Horizontal location was unaffected.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. 		Unknown Interference 09/29/2021
415 08/15/2021 At Sea sout Sicilia Italy Marine USER: Both of GPS receiver lost signal , its seem like external signal alteration, all Sat signal lost and come back for few second and lost again for 2 hours.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 09/29/2021
414 08/12/2021 NE of TUNISIA Marine USER: Alarm Code - 212 Loss of position.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 09/29/2021
413 08/11/2021 Port Said,Egypt Marine USER: At 0300LT while getting underway from anchorage C-3, North Anchorage, Port Said, Egypt the vessel lost DGPS signal due to heavy Interference. We have two units on board. DGPS#2 regained signal after a couple of minutes while DGPS unit #1 had to be factory reset and rebooted several times before it was able to acquire satellites later in the day. Is this a common occurrence in the Suez Canal or was just an anomaly? The Suez canal Pilots said it is a common occurrence in the canal.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 09/07/2021
406 07/28/2021 At sea Marine USER: The vessel was sailing towards port said when we first encountered interference, we are now at am anchorage position out of Suez canal and the interference keeps occuring at intervals of about 10 minutes.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 09/29/2021
409 07/28/2021 Port Said Egypt Marine USER: Vessel transiting Suez Canal Northbound. Bound for Algeciras Spain.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 09/07/2021
412 07/21/2021 Харьков Research USER: Good afternoon, we have been observing anomalies for a long time, large scatter in the time scales of the satellites on receiver 1 according to the P code, receiver 2 also cannot correctly receive the p code. At the L5 frequency, the number of sessions was reduced to a few per day at the time of writing, at the L5 frequency during the week only 4 PRN 1,18,25,31 satellites were emitting. PRN 11 did not determine the azimuth and showed a large discrepancy between the satellite time and GPS time. please tell me what could be the problem.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The L2 signal in this region can be unreliable due to proximity to conflict zones. Both L5 and PRN 11 are currently set UNHEALTHY to users. Update: RS reported that the anomalies have stopped. They stated that the use of the signals is primarily for timing. The anomalies were observed on L1 and L2, however, L5 timing was unaffected. 		Unknown Interference 09/29/2021
401 07/09/2021 Egypt User: Vessel was making way and lost GPS function.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 09/07/2021
400 07/07/2021 Port Said East Container Terminal Marine User: The vessel was just finishing up transiting the suez canal when GPS interruption began. We would lose signal for about 5 minutes then it would come back for about 5 minutes. This lasted at least 1 to 2 hours as we exited the canal. We received reports from other vessels that they were having issues as well. The units on board are old models and scheduled to be upgraded during next docking period..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 07/19/2021
397 07/02/2021 NW corner of Tunisia Marine User: Beginning with one unit only, GPS began to alarm "NO FIX" at 1100 at sporadic intervals. By 1300 both units indicated "NO FIX". Position has been briefly fixed, only to alarm again within 6 minutes or so..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 07/19/2021
398 07/02/2021 OFF PORT SAID, Egypt Marine User: Both GPS reciever losing position fix intermittently..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 07/19/2021
396 06/30/2021 Suez Canal Marine User: On receiver display: "Signal lost". Ships in vincinity confirmed similar signal loss..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 07/19/2021
395 06/26/2021 East of Malta Marine User: Vessel bound from Algeciras, Spain to Port Said, Egypt..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 07/19/2021
393 06/22/2021 At sea, 70NM East of Malta Marine User: Please be informed that early morning today at 0040LT/22 June GPS Pos. Lat 35-53.0N, Long. 016-01.2E, 70NM East of Malta, we experienced GPS interference. This resulted in Loss of Position on equipment. GPS interference was experienced from time to time after the first occurrence. .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 07/19/2021
392 06/14/2021 Galina, Alaska Surveying  User: Checking grade for road construction.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. NAVCEN requested additional information, but reporting source did not respond. 		Insufficient Information 07/19/2021
390 06/07/2021 Emporia, VA Communications User: Traveling to and from Emporia Virginia and Norfolk Virginia said GPS SIGNAL was lost. Since Friday June 4th.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. NAVCEN requested additional information, but reporting source did not respond. 		Insufficient Information 07/19/2021
389 06/05/2021 Italy Marine USER: All GPS RECEIVERS WENT INTO ALARM MODE WITH LOSS OF SIGNAL. OTHER VESSELS IN AREA ALSO REPORTED ISSUES.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 06/08/2021
386 06/04/2021 South of Sicily Marine USER: Various other vessels in the area encountered the same condition.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 06/08/2021
388 06/04/2021 Off Sicilia, Italy Marine USER: The vessel has been experiencing an intermittent loss of GPS signal on both GPS units aboard. The Max time so far has been around 10 minutes of signal loss, and then it has come back. We have restarted the units and made a few course changes to see if things improve. Over the last hour, the GPS signal has been in and out. We have heard other vessels report similar issues with loss of position. I would estimate that we have lost signal for about 15 minutes during the last hour.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 06/08/2021
399 06/01/2021 Jonesboro, AR; Craighead Forest Park Other USER: I’m wondering if someone has a GPS jammer or something else that interferes running in or around here; GPS locks go in and out on all equipment I’ve used in the area.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 09/07/2021
385 05/25/2021 Malta Channel, Med Marine USER: All ships in the vicinity (60 nm reach of Malta Channel) lost all satellite signals at the same time. No signal received since around 23:20 LT on May 25th, ongoing. From 22:00 LT to 23:20 LT intermittent loss was experienced, and vessel also lost radar signal for around 2 minutes once.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 06/08/2021
380 05/24/2021 Riace, Italy Marine USER: No pos. gps.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/27/2021
383 05/24/2021 Tacoma, WA Automobile USER: Moving car icon on screen often displayed location several hundred yards to the West of where we were actually causing Google maps to continually attempt reroute off of surface streets when we were on main highways between Tacoma and north up Kitsap peninsula to Narrow stone Island. Two devices displayed same anomaly over several hours.

NAVCEN: Sent reporting source mapping updating information. 		Mapping Issue 06/08/2021
382 05/22/2021 East Mediterranean Sea Marine  User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/27/2021
379 05/17/2021 Dallas Automobile Google maps down. Possible widespread gps problems.

NAVCEN: Provided reporting source the website information to GPS.gov for mapping issues.		 Mapping Issue 05/27/2021
378 05/14/2021 Lompoc, CA USER: Was going to the beach, could not acquire GPS signal. My phone is brand new, so problem lies within the satellite.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 05/27/2021
377 05/13/2021 Marthas Vinyard Surveying USER: Lost GPS on 4 vessels at the same time. 3 were located near Marthas Vinyard One was located around 38N2645 74W4647.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 05/27/2021
376 05/12/2021 Guam Surveying USER: Launches occur everyday 9pm 1030 pm Our ground based receiver stays on 8-12 GPS, our radiosonde frequently drops to 0. It started October 10 2020 through November 26 2020 almost all of our night launches had half for more GPS dropouts. Now our issues are with daytime launches. Todays launch the radiosonde went from 6 GPS while on the ground to 0 when it was launched.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but reporting source did not respond. 		Insufficient Information 05/27/2021
375 05/09/2021 CYPRUS, LIMASSOL Marine  User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/27/2021
374 05/08/2021 CYPRUS, LIMASSOL Marine User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.  		 Unknown Interference 05/27/2021
372 05/04/2021 PELLOPONISOS GREECE Marine User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/27/2021
370 05/02/2021 North end Boca Ciega bay, Florida Marine USER: All satellites stopped receiving at noon and lasted for exactly 10 minutes when reception restarted.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 05/27/2021
371 05/02/2021 PANTELERIA ISLAND Marine User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/27/2021
369 04/28/2021 Eastern Mediterranean Transportation USER: roughly 12 hours of gps spoofing upon departure from port Said Egypt. GPS signal rapidly shifted numerous times, position 6-8 miles off. Position dropped for 90 percent of the 12 hours. GPS aboard connected to ECDIS, RADAR,AIS, GYRO repeater panel, GMDSS suite.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/27/2021
368 04/23/2021 Jeddah - 3nm before the port limit Marine USER: For the length of our stay 23/0000 till 23/1900, we experienced intermittent reception or not at all (port approaches and alongside).

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/27/2021
367 04/21/2021 Malta Channel Marine USER: GPS signal lost for 2 minutes.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/03/2021
366 04/18/2021 East Mediterranean Sea Marine Lost GPS signal for six-minutes from 1620 GMT to 1626 GMT.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/03/2021
365 04/13/2021 Eastern Mediterranean Marine GPS jamming begins, affecting both GPS units. Our position was @ 36-06N, 016-58E, and we were on a course of 100 T, with a speed of 17.8 kts. The GPS receivers had @ 8 satellites in view, but the Signal to Noise Ratio (SNR) of all satellites changed continuously from 0 to less than 30 for all satellites. Both GPS receivers were alarming, indicating a “loss of signal.” I switched GPS #2 to primary, because it also receives position data from GLONASS. This allowed our ECDIS to continue to function. The jamming was solid for 8 minutes. .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/03/2021
359 03/17/2021 California Other My GPS keeps going in and out saying satellite connection lost. I need this problem resolved as I am an over the road trucker.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond. 		Insufficient Information 05/03/2021
357 03/02/2021 GeekHo, Pine Cay. Turks & Caicos Islands Timing USER: It is an NTP server, but I keep track of how far my house wanders, and it went 40ish meters away from average.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond. 		Insufficient Information 05/03/2021
358 02/24/2021 Campeche, Mexico Transportation  User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond. 		Insufficient Information 05/03/2021
354 02/10/2021 Between Malta and Sicily Marine User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 03/01/2021
355 02/10/2021 25-50 miles NW from Port Said, Egypt Marine USER: Signal lost on both units for about 2 hours. After that constant disturbance, but receiving position on one or another unit with some 5-7 minutes intervals. Back to normal signal on both units 10Feb2021 Other vessels in vicinity did confirm same issue with GPS signal.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2021-004-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/03/2021
353 02/07/2021 East Central Med Marine USER: The ship encountered total loss, last position: Encounter Feb 6-7.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 03/01/2021
352 02/04/2021 North of Pantelleria Island Med Sea Marine USER: Vessel bound from Algeciras, Spain to Port Said, Egypt. Disruption began North of Pantelleria Island and has continued intermittently till east of Malta.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 03/01/2021
423 02/01/2021 Mt. Potosi (South of Las Vegas Nevada) Surveying USER: The interference at this station has been ongoing and intermittent throughout the day for close to a year at least. We recently installed a different antenna and the interference seems to be more identifiable as intermittent bursts throughout the day. It seems like there is communication that is on the L2 GPS and GLONASS frequency. When the burst occurs the L2 signal on both systems is eliminated. I do have screen displays of the satellite signal and the interruption as it occurs and I would be happy to send you a recording real-time. The number and name of satellites reported are not necessarily accurate as the disruption occurs throughout the day every day with varied satellite availability and location. .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. Local interagency investigation for interference is ongoing.		 Unknown Interference 10/19/2021
356 01/28/2021 Houston Other Interference seems to be in the 1580-1600 MHz band.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. Update: Erroneous signal no longer present.		 Unknown Interference 05/03/2021
347 01/22/2021 EAST OF TAIWAN Marine User: THIER WAS LOSS OF SIGNAL FOR GPS.VESSELS IN VICINTIY ALSO REPORTED LOSS OF SIGNAL ON VHF. .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 03/01/2021
348 01/22/2021 Enroute from Qatar to Bahrain Marine USER: departed Mesaieed, QATAR bound for Bahrain. Approximately 1 hour after departing Mesaieed we began intermittently losing our GPS feeds from both GPS Units. This issue has continue occurring for over 12 hours and we experienced GPS loss from 1-5 minutes at each occurrance. We made contact with two other vessels in the area to find out if they too were having these same issues (allowing us to rule out a wiring or other issue). These vessels reported that they too were experiencing the same issues. The vessel is presently at Anchor off Bahrain about 40nm Offshore and has experienced the issue again since anchoring. Of interest may be an AIS contact displaying as a 20 Meter long Pleasure Craft named SEA HOPE, Call Sign A9D275C. I am noting this because presently wind speed are approximately 40Knots and Seas are at about 3.0M, Not the normal conditions you would expect to see a pleasure craft holding station. This craft is about 6nm from our present location..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 03/01/2021
351 01/19/2021 Ellison Bay Marine USER: GPS NAIS disruption at tower at Ellison Bay, Wisconsin. .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. The Federal Communications Commission conducted a local investigation. They identified the cause to be spurious emission from equipment collocated on the tower. GPS functionality returned with the elimination of the spurious emission.		 Unintentional Interference 03/31/2021
349 01/16/2021 Florida Marine USER: SV and DOP plot available on receiver shows a loss of satellites for about 45 minutes. The plot is a mess showing sats are most likely in and out causeing the position to be erratic and unusable. The same problem occurred again at exactly the same time on 23 January.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 03/01/2021
373 01/16/2021 Global Surveying CNES has detected a repetition of IODE for PRN09/SVN68 on January 16th, 2021.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment on the reported matter and validated the observed IODC repetition. The discrepancy has been resolved. 		IODC_10-Bit 07/19/2021
345 12/21/2020 Luvkushnagar(Laundi), India Transportation USER: Tried many phones but GPS location is not found. One govt app is not working at the location but after 7-8 kilometre it is found working. This is happening since last one month.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 01/21/2021
344 12/19/2020 zwolle, The Netherlands Automobile USER: sudden change in date/time, position seemed ok.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 01/21/2021
341 11/28/2020 Bull Lake Dam Surveying USER: Performed a 24-hour observation on a control point with a 3-second collection interval. Error/noise was too great for OPUS to analyze the data file of collection points. 1D error was roughly 6 meters and 2D error was roughly 4 meters at the beginning of the observation.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Unknown Interference 01/21/2021
340 11/17/2020 I5 north going through Seattle Automobile User: Getting message “unable to connect” on vehicle showing no gps on phone and location way off.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, including any information from equipment manufacturer, but the reporting source did not respond.		 Insufficient Information 12/15/2020
338 11/15/2020 Powell, TN 37849 Transportation USER: In Powell,TN, zip code 37849. For years, GPS has routed truckers onto E.Raccoon Valley Road from Old Raccoon Valley Road as a shortcut to Norris Freeway, state road 441. First, it is not a significant shortcut; only a few seconds difference if they had maintained their original heading. Second, and most importantly, when they try to turn south onto Norris Freeway from E.Raccoon Valley the result is always the same. The truck ends up blocking both lanes of traffic because it cannot make the turn and the trailer is sitting on its parking legs due to the elevation. The truck always has to be towed out of this position, blocking traffic for a couple of hours and because it is the midpoint of a fairly sharp curve, this is an accident waiting to happen. I’m requesting your help in getting this routing error changed. Thank you.

NAVCEN: NAVCEN provided the website information to GPS.gov for mapping issues. Also contacted the Knox County Public Works for further investigation to determine alternate safety precautions.		 Mapping Issue 12/15/2020
339 11/15/2020 Pacifica, CA Marine User: While conducting a search near Pacifica CA , Unit lost GPS position on both receivers. Went into settings and one unit was receiving more than the other with one being near zero reception. Moved further offshore and south and was able to reacquire GPS position.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. Federal agencies will continue to monitor and investigate the situation. NAVCEN will provide updates as new information becomes available.		 Insufficient Information 12/15/2020
336 11/06/2020 Peachtree Corners Automobile User: Most GPS units direct users to a parallel road instead of my address.

NAVCEN: NAVCEN provided the website information to GPS.gov to correct mapping issues.		 Mapping Issue 12/15/2020
335 10/26/2020 Laurelhurst, WA User: No additional info known.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 12/15/2020
334 10/20/2020 Stockbridge and McDonough GA Transportation User: Kept reporting "GPS Network Unavailable" I reset phone twice but did not correct the problem. Wifi location worked when there was signal around.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 10/27/2020
332 10/08/2020 Horace Williams Airport, Chapel Hill NC Surveying User: I was performing a drone aerial mapping project in the area of Chapel Hill, NC, specifically at the abandoned Horace Williams Airport. Launched the drone, and it did not go to where I designated it to go and was appearing to want to fly away. Landed the drone and retried the mission with the same results. Drone acted like it did not know where it was. Drone equipped with onboard GPS capable of tracking both GPS and GLONASS SV. I also wanted to survey some points on the ground for reference for the mapping I was doing. I was using Survey Grade GPS receiver. I could see on the data collector that controls the receiver that I had at least 10 - 12 satellites visible, however, it was only locking on to 5. Of the 10-12 satellites visible, 2-3 of those were GLONASS SVs and the rest were GPS SVs. Finally, I was at this same site on the prior Monday and had no GPS problems or interference using the same equipment.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN recommended contact manufacturer for assistance. Requested additional information, including any information from the manufacturer, but the reporting source did not respond.		 Insufficient Information 10/27/2020
333 10/06/2020 Boston, MA Marine User: Intermittent loss of position causing blank screen 10-15 times/day over three days.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners or users. NAVCEN requested additional information, including any information from equipment manufacturer, but the reporting source did not respond. 		Insufficient Information 10/27/2020
330 10/05/2020 Houston, TX Marine User: Could not receive any SVs to my 212 while departing Cargil 2. Later during my outbound transit my 212 had no problem receiving SVs. Spoke with a pilot who experienced the same phenomena @ Cargil 2 while driving into the slip, lost all SVs. Possible GPS jamming from trucks nearby?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. NAVCEN requested additional information, but reporting source did not respond. Investigation is ongoing.		 Insufficient Information 10/27/2020
331 09/29/2020 transiting inside Suez Canal N-bound Marine User: DGPS available on both. We switched also to gps only but get same errors. Restarted them one by one interlinking the other with the systems, but get the same result.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/27/2020
325 09/25/2020 Mediterranean Sea Marine User: Additional vessel in area were experiencing similar GPS failures.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/20/2020
326 09/25/2020 Italy Marine User: Both of our GPS where having satellites blocked causing signal loss. It happened off and on for about 3 hours. Called other ships in the area and they were having the same issue.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/20/2020
327 09/25/2020 Mediterranean Sea Marine User: Intermittent GPS signal beginning at 0130Z which lasted for approx. 1-hour. Occurred again at 1030Z posn 35-20N 18-43E, and 1325Z posn 35-35N 17-40E for 15 minutes respectively.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/20/2020
323 09/23/2020 South East of Italy Marine User: During navigation in the Mediterranean Sea in the above mentioned position at 06:34 AM Local Time due to inference we lost signal from 3 GPS. Position Data Lost At 07:03 AM Local Time the signal for all 3 GPS returned and all equipment recovered.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/20/2020
324 09/22/2020 East of Malta Marine User: Ships in immediate vicinity are understood to be experiencing the same signal-loss issues.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-016-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/20/2020
328 09/21/2020 Port Hedland, Western Australia Marine User: Intermittent but frequent loss of PPU Operations that appear to be GPS related as they lose position. PPUs receive Differential Corrections from a beacon some 200km away but that Beacon operates only on GPS Satellites, not any other constellations satellites.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. Update: Further investigation by reporting source revealed connectivity issue.		 User Equipment 10/20/2020
322 09/16/2020 Southern Gulf of Suez Marine User: My guess is that we experienced GPS jamming. In March 2020, while in the ASRY shipyard, the Fairfax had two new GPS receivers installed; one Furuno, and one SAAB. The SAAB model receives both GPS and Glonass position signals, and sends both to the ECDIS. These positions are usually within 3 to 10 meters of each other - very accurate. Because we have experienced GPS jamming on this vessel, several times before, in Port Said and in the Suez Canal, we proactively made the SAAB GPS/Glonass receiver the Primary ECDIS position sensor, to help defeat any GPS jamming. It worked -- we never received alarms, or lost our ECDIS picture. Since the AIS has its own stand-alone GPS receiver, it makes sense that we would lose all AIS data during a GPS jamming event. The momentary loss of radar video could be explained as the ECDIS lost the GPS data, and switched to the Glonass position. Again, this is my own guess. If the problem had continued, I could have made the Furuno GPS the primary sensor, to see if we would experience the full experience of GPS jamming problems. I did not think of doing this until later, well after the problems disappeared.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 10/20/2020
321 09/10/2020 Beirut, Lebanon Marine User: Vessel is equipped with two identical GPS receivers. Both GPS units encountered intermittent disruption simultaneously. The disruption was first encountered briefly in Eastern-Mediterranean Beirut Lebanon coast. Complete loss of signals for a period of 1 to 2 hours.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 10/06/2020
319 09/03/2020 Las Cruces, NM Agriculture User: Intermittent problem Have switched from RTK to Autonomous to SBAS and confirmed 0 satellites Have swapped out components but will cut out. It appears to be in this area We have also noticed interference on vehicle SAT radio interruptions Clear view no obstructions

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. There was no response to our request for additional information. 		Insufficient Information 10/06/2020
317 08/31/2020 Port Said, Egypt Marine User: Vessel is equipped with two identical GPS receivers. Both GPS units encountered intermittent disruption simultaneously. The disruption was first encountered briefly in Eastern-Mediterranean Sea off Greece. Disruptions were again encountered with increased frequency and effect when our vessel approached the port of Port Said, Egypt. Each disruption caused partial to complete loss of signals for a period of 1 to 2 minutes. HDOP levels were observed to be in the range of 6. Restoration of signals were as abrupt as the disruption. The disruptions continued with lesser frequency as vessel progressed through the Suez Canal. About 45 nautical miles inside the Suez Canal from the Northern Entrance, disruptions ceased completely and since then both the GPS units have been functioning normally. A Navtex message (message number OA89. NTM 038/20) from Malta Radio dated 29th Aug 2020 warned mariners regarding "Harmful Interference to the GPS and GNSS".

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 09/10/2020
320 08/28/2020 Buenos Aires Communications User: I work as a engineer for Canal 9 of Bs. As. Argentina GMT -3, our transmission system uses the GPS signal. But every other week, more precisely every other Friday (every 14 days) it happens that between 01:25 pm and 01:35 pm some shift in the GPS signal happens since our 4 modulators with four different antennas present a type of failure. The 4 antennas are located in the same place. A few minutes ago the failure occurred and is systematic. Do you make any automatic adjustments during those hours? Thank you!

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. There was no response to our request for additional information. 		Insufficient Information 10/06/2020
316 08/24/2020 Gonzales, Texas USA Automobile User: Not the first time outages have occurred.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 09/10/2020
318 08/22/2020 Sterling, Virginia Research User: Expected to track M-code on PRN 18 (SVN-75) but was only able to track Y-Code on L1 and L2 frequencies. Other M-Code capable satellites (PRN 15, 30, etc.) in view were able to track M-Code on both L1 and L2. Was there a disruption on PRN-18 regarding M-Code?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. There were no authorized GPS tests in the area. No correlating reports from interagency partners. L1 M-Code was tracked by at least one other R&D partner during the time frame. NAVCEEN requested additional information, but reporting source did not respond.		 Insufficient Information 10/27/2020
315 08/21/2020 Darjeeling, India Timing  User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. NAVCEN requested additional information, but the reporting source did not respond. 		Unknown Interference 09/10/2020
314 08/19/2020 Hal-Far Other User: The Malta Communications Authority has investigated reports of GPS interference during July-August 2020. A source located outside Malta is causing this interference which is affecting land, maritime and aviation users.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. 		Unknown Interference 09/10/2020
312 08/15/2020 Far Rockaway Transportation User: Today as well as Friday, we kept receiving messages on our cell phones that they could not connect to GPS.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. NAVCEN requested additional information, but the reporting source did not respond.		 Insufficient Information 09/10/2020
310 08/14/2020 North of Pantelleria Island Marine  

User indicated an intermittent problem that was otherwise unspecified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 09/10/2020
329 08/04/2020 Global Surveying User: CNES (Centre National d Etudes Spatiales, French Space Agency) has detected a repetition of IODC for PRN19, SVN59 on August 4th, 2020. The detection is based on a consolidated navigation message file, built from RINEX navigation files issued by numerous IGS stations. Could you please confirm the IODC repetition?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment on the reported matter and validated the observed IODC repetition. The discrepancy has been resolved. 		ICD_Violation 10/27/2020
309 07/30/2020 Suez Canal Marine User: Intermittent alarm on all equipment connected to GPS

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 08/19/2020
313 07/30/2020 Malta Other User: Local authorities were contacted and it had been confirmed that there are interfering signals from south direction.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. 		Unknown Interference 09/10/2020
308 07/29/2020 Port Said, Egypt Marine User: Vessel experienced intermittent outages from 1730 local departing Suez Canal to 2142 local at Lat 31-48.0N Long 031-51.6E. Position became erratic before failing entirely. Vessel resorted to manual fixing in DR mode when system erratic or failed.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 08/19/2020
307 07/26/2020 inside of Persian Gulf Marine User: We observed GPS interruption when vessel transiting in between K.A.S. and Iran. Date & time: 0907UTC 26-JUL-2020 Position: 27-10.1N 051-09.4E / <069>11’ from Ra’s Tannurah by Duration: 10min Comment- Outage report received from Master of vessel Tanzawa. .

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 08/19/2020
306 07/22/2020 Chambersburg PA Timing User: 20.3.3.5.1.8 Special Messages. Sub Frames errors. Octal 252 Character Hex AA, not an allowed character in a special message. At a point earlier we were seeing parity errors on Word 4 for every SV in view. Seeing this on hardware in PA, NJ, MA, CO, CA, Munich, and Bangalore India

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment and determined, due to operational tasking, an unexpected condition was broadcast from subframe 4, page 17 of the GPS navigation message which may have affected certain user equipment. Subframe 4, page 17 data is allocated for special messages per IS-GPS-200.		 ICD_Violation 09/03/2020
305 07/18/2020 Edmonton User: This has been ongoing in the city of Edmonton for quite some time.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. There was no response to our request for additional information. 		Insufficient Information 08/19/2020
304 06/17/2020 Sao Marcos Bay area Marine User: ON 17TH JUNE 20 AT 0415LT"NO FIX ERROR" WAS DISPLAYED ON BOTH GPS RECEIVERS.GPS LOST SIGNALS EVERY 10 TO 15 SECONDS.ALL EQUIPMENT ASSOCIATED WITH GPS IN INS STARTED MALFUNCTIONING.THIS STABILIZED AFTER 2 HRS. THIS OCCURRED ON 18TH JUNE MIDNIGHT WATCH HOURS ALSO.THE SHIPS IN VICINITY ABOUT 4 MILES FROM OWN POSITION DID FACE SAME PROBLEMS.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment. There were no authorized GPS tests in the area. No correlating reports from other agencies. Space Weather Prediction Center indicated its possible this report of interference is due to equatorial anomalies.		 Unknown Interference 07/30/2020
303 06/16/2020 Downtown San Francisco Automobile User: While driving a familiar route under same conditions as many times before, GPS signal became unstable, and position was several hundred feet wrong, condition persisted for about 40 minutes. While crossing golden gate bridge, location was shown as 1,000 feet west of bridge and error continued while on 101 northbound past Marin.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. There was no response to our request for additional information. 		Insufficient Information 07/30/2020
302 06/07/2020 Cyprus, Limassol Marine User: No Fix, Unsafe, Caution, DOP ERROR from Cyprus to Beruit, Port of Beirut to about 100 NM South of the Port before it all cleared 6/7/2020-6/9/2020 0230 (-2)

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 07/30/2020
301 06/05/2020 Gilbert Surveying User: Setup the base receiver and was not able to obtain a solution due to 0 GPS satellites. I did see 1 or 2 GPS satellites over the course of 10 minutes however these were intermittent. I took the receiver approx. 1/2 block away and then received up to 10 GPS satellites. Driving back to the previous location the GPS satellites drop to 0 again with the intermittent 1 or 2 over a 10 minute period. The GPS issue wasnt seen when working this site back in February of this year.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. 		Insufficient Information 07/30/2020
297 06/03/2020 Mississippi River at Muscatine, IA Timing User: Recurring issue in Spring, Summer, and Fall since at least 2018 occurring usually multiple times per week. Issue not present or severely diminished in the winter. Issue present at all hours of the day. Can not correlate to time of day, weather conditions, or temperature. Occasionally happens to multiple devices at the same time, but one device sees this issue the most / first, suggesting directionality from the northeast. Duration of event is between several seconds and 24+ hours. Often lasts several hours.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. Investigation ongoing. Update: Reporting source has replaced equipment with positive results.		 User Equipment 07/30/2020
294 05/14/2020 Spotsylvania User: This is based off of my GPS enabled running watch being unable to pick up GPS signal at my house, but it picks up the signal around a quarter mile away from my house.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. NAVCEN requested additional information, including any information from their equipment manufacturer, but the reporting source has not responded. 		User Equipment 06/16/2020
292 04/18/2020 Black Sea Surveying User: Multiple vessels in the Black Sea lost GPS and Glonass positioning, simultaneously. We are a seismic survey vessel with multiple DGPS receivers. Other vessels in our immediate vicinity also reporting loss of positions. Situation started at 06:17UTC and is ongoing at 07:45UTC. Occasional GPS satellite information being received but dropping out more than in.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. The report of interference is similar to that outlined by U.S. Maritime Administration in Maritime Advisory 2020-007-Various GPS Interference. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/08/2020
293 04/14/2020 Las Vegas area User: General question of GPS satellite system usability in Las Vegas area. Some observations after 04/14/2020 that satellites could not be used continuously.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. Issue subsided; reporting source will continue to monitor and update NAVCEN. 		Insufficient Information 06/16/2020
291 04/09/2020 ST. JOHN RIVER. ATLANTIC BEACH FL Marine User: While transiting in the St. Johns river, in vicinity of Atlantic Beach, Fl a Coast Guard Vessel experienced a GPS outage. Losing both of the ships GPS receivers during their mooring evolution. Unit verified with another USCG vessel, at the pier, who was experiencing the same issue. Unit restarted both GPS displays with no resolve. After waiting approximately 20 minutes GPS signal regained and seems to be working properly.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies. Ships crew will continue to monitor GPS and provide updates. 		Unknown Interference 04/22/2020
288 03/29/2020 South of Hormuz TSS Marine User: 2 GPS units aboard the newer is a Furuno GP-170 is only losing signal momentarily. SAAB unit has not received a position for 6 hrs.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. This report correlates with the U.S. Maritime Advisory 2020-001-Persian Gulf, Strait of Hormuz, Gulf of Oman, Arabian Sea, Red Sea, Gulf of Aden, and Indian Ocean-Threats to Commercial Vessels by Iran and its Proxies on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 04/22/2020
287 03/24/2020 Warrenville, IL USA Automobile User: I used GPS for a trip immediately prior to this anomaly, without issue. When I attempted to enter my next trip leg, I noted an anomaly. My GPS apps could not locate my vehicle correctly and could not plot a course to my destination. The map display spun around multiple times, and at times placed my vehicle at the end of nearby dead end roads and even in the middle of a nearby field. I restarted the apps, to no avail. I restarted my phone and the bizarre behavior continued. About fifteen minutes after first noting the problem, I restarted my phone again and my GPS apps began working correctly. I do not know if it was a device issue or a GPS system issue. As of this date, I have used GPS twice on this device, without issue.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. There was no response to our request for additional information. 		Insufficient Information 04/22/2020
285 03/16/2020 Medford, Oregon Timing  User: We use GPS timing servers across our network within the CONUS. Across our network at approximately the same time, the timing servers went into holdover. As this issue was seen in multiple places, we do not think there were any issues with the hardware or software. We are trying to understand if something impacted the GPS satellite systems ability to provide timing on March 16th, 2020.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

NAVCEN requested additional information about the equipment, if issue is on going, or actions taken to correct the problem. There was no response to our requests for additional information. 		Insufficient Information 06/16/2020
284 03/13/2020 Central Mediterranean Sea Marine User: NO GPS SIGNAL on 2 independent units. Other ships in vicinity reported the disruption over VHF Ch 16.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. This report correlates with the U.S. Maritime Advisory 2019-013 Eastern Central Mediterranean Sea and Suez Canal GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 04/03/2020
290 03/10/2020 Colorado Springs, CO Other User: Since the morning of 3/10 we have seen low accuracy GPS readings for our fleet of tablets which is still ongoing. This results in GPS locations being off from a couple of blocks to a mile with the inaccuracy being more pronounced when stopped. This has occurred throughout the Colorado Springs area at all times of the day.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users.

Update: The mobile provider has identified the issue and is working on an update to correct it.		 User Equipment 04/22/2020
283 03/09/2020 Boulder User: Noticed irregular signal multiple times near the same block during weekdays.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. Federal agencies will continue to monitor and investigate the situation. NAVCEN will provide updates as new information becomes available. 		Insufficient Information 06/16/2020
282 03/04/2020 Everett Turnpike Route 3 & E Dunstable Rd Automobile User: I have had a number of intermittent GPS issues within 1 mile of this location over the past year. GPS drops almost exactly 10 mph and the location plots diverge for approximately 1km parallel to the actual track. I took a picture of the GPS track showing the deviation. Contact me if you would like a copy of the track picture. I had previous similar incidents in the same vicinity.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. Federal agencies will continue to monitor and investigate the situation. NAVCEN will provide updates as new information becomes available.		 Unknown Interference 04/13/2020
311 03/01/2020 Bothell, WA Automobile User: Greetings, pretty much the whole year I need to recalibrate maps every ten minutes to get a good gps signal. My job requires it as I will not receive offers with a weak signal. I have purchased 2 different phones within the last year to fix the issue but it is still present. I work mostly in Woodinville, Bothell, Kirkland and Redmond Washington. Multiple people said they are experiencing the same issue and it is strange because I heard space x recently placed another satellite into orbit for Washington state. Thanks for all that you do.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. Recommend contacting manufacturer for assistance.		 User Equipment 10/06/2020
280 02/20/2020 Dulles Airport Automobile USER: This occurred in Chantilly, VA around 4pm EST. I was on Rt. 50 heading East near Avion Pkwy close to Dulles Airport. The GPS navigation in my vehicle stopped working. When I looked for more information in the GPS it displayed no bars for a GPS satellite signal. This outage continued until the end of my trip in Reston, VA. I made two attempts to turn off my vehicle and restart the navigation during the trip, but this did not work to restart my GPS navigation. It was when I stopped the vehicle, stopped the engine, and got out of my car for 10-15 minutes that the GPS system resumed activity. I hope this is just an anomaly, however being so close to airport, I have to wonder if something else was occurring at the time.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

NAVCEN requested additional information about the equipment, if issue is on going, or actions taken to correct the problem. There was no response to our request for additional information. 		Insufficient Information 03/09/2020
279 02/17/2020 Rehoboth MA Automobile USER: Position shown on maps was off by approximately .5 mile to the west. Also had same occurrence last night while in the same general area. When I noticed the issue on my Nav radio, I checked location on my iPhone and it was consistent with the radio in showing the wrong location.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

NAVCEN requested additional information about the equipment, if issue is on going, or actions taken to correct the problem. There was no response to our requests for additional information. 		Unknown Interference 03/09/2020
286 02/12/2020 Worldwide Other User: In February 2020 (Feb 12th, 13th, 15th and 16th), PRN19 has broadcast several ephemeris and clock data set with the same IODC, although the data was different. This does not respect the IODC repetition rule in §20.3.4.4 of IS-GPS-200.

NAVCEN: The GPS Operations Center reported that the cause of the IODC repetition error was the result of an issue experienced with the ground control system. The problem has been corrected. 		ICD_Violation 06/16/2020
277 01/20/2020 Gibsonton, FL Automobile User: I was driving following my GPS when all of sudden it lost GPS signal on the highway. I checked my vehicles GPS also and it could not lock on to me. It finally returned after about 20 mins but something must have knocked it out.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

NAVCEN recommends continuing to notify us if symptoms in the area continue. 		Unknown Interference 02/25/2020
276 01/14/2020 Paso Palma User: My GPS position is changing. Beginning on 1-14-2020 almost every day, why is that? I measure from the same point at my home.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

We recommend user ensure equipment software is up-to-date, refer to your equipment manual, or contact your equipment manufacturer for further assistance. NAVCEN requested additional information about the equipment, if issue is on going, or actions taken to correct the problem. There was no response to our requests for additional information.		 Insufficient Information 02/25/2020
275 01/13/2020 BARCELONA, SPAIN Marine User: We were alongside in Barcelona same day from 12:18 till 16:23 UTC. We just restarted both units without any success - NOT SAFE -indication persists. During our stay alongside it was brief moments when NO FIX was displayed. DOP at not very high levels (1.7 / 3.0) In GPS manual it says that if DOP is close to level 6 the GPS will show 2D position, only. My portable GPS receiver (Garmin / hand-held) set on GPS satellites shows correct positon (checked alongside) and has No. 5 /13 /15 / 17 /20 / 21/ 24 /28 /30 /38 satellites locked - no.7 and 19 on sight I hope our answers will help you !.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information, including any information from their equipment manufacturer.

Update: User worked with the equipment manufacturer conducted a reset procedure and checked settings, operations back to normal.		 User Equipment 01/28/2020
273 01/02/2020 Dubai, UAE Communications User: At around 2AM(GMT+4) 2nd Jan 2020, around 100 outdoor wireless broadband CPEs started reporting loss of GPS satellites. GPS synchronization is necessary for our radio devices which kept dropping link as a result for 8-10 hours due to GPS receiver switching between GPS lock and satellites lost(very low SNR). The units were rebooted and everything got back to normal immediately. Everything seems to be running fine for past 36 hours since the reboot.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. This report correlates with U.S. Maritime Advisory 2019-012 Persian Gulf, Strait of Hormuz, Gulf of Oman, Arabian Sea, Red Sea-Threats to Commercial Vessels by Iran. You can find the full text on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 01/28/2020
274 01/01/2020 CABA Other User: When the equipment tries to establish a GPS link, when it reaches 80%, the controller indicates "Calibration Error In The Compass, See Another Place or Calibrate It Again", if you try to recalibrate the compass the screen indicates " Do Not Know You Can Calibrate The Compass Without GPS" and this is a vicious circle regardless of where you try to perform the operation. From the little I found on the web, the problem occurs "Worldwide", which rules out an inconvenience in my teams or even more in my country. By way of verification, I share a link with manifests from hundreds of users from all over the world with the same inconvenience. Could you please give me some information about it? Thank you in advance and have a nice day. https://community.gopro.com/t5/Karma/Karma-won-t-start-amp-compass-calibration-failed-no-gps-signal/td-p/488828 "

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other interagency partners.

There is a known issue with how the equipment handled the updated GPS week number value.

NAVCEN recommended user to contact the manufacturer for additional assistance. 		User Equipment 01/28/2020
296 01/01/2020 Lancaster CA, Hwy CA-14 crossing Ave J Transportation User: This location, on CA-14 northbound crossing over Ave J in Lancaster CA has a permanent disruption of GPS reception noticed over 6 months, driving daily in early evening and late evening, and is detected by 2 separate models of Garmin automotive GPS units. There is no overhead signage that could cause a drop out. The drop out and loss of reception covers a span of approximately 200-300 yards centered on the Ave J overpass.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other agencies or users. Investigation ongoing, NAVCEN will provide updates as new information becomes available.		 Insufficient Information 07/30/2020
272 12/28/2019 Tripoli Libya Other User: Our vessel is underway from Greece to Tripoli Libya. When our vessel is at 50nm from Libyan Port. Disruption or interference of GPS Signal started and both GPS receiver is affected. We reboot our GPS but still the disruption still exist, despite of how many times we reboot our equipment. Until we arrived at Tripoli Port interference still exist with an interval of 20-30secs GPS Lost signal again. We stayed at anchor for 2days already and yet no improvement of the disruption and it continues everyday. It is not the 1st time it happened but every time we are inside of 50nm from Tripoli Libya.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 01/28/2020
270 12/06/2019 Naples, FL Orange Blossom Rd User: This entry to the Autumn Woods Association is closed. GPS directs vehicles through this entry and they damage property. The correct entry is Goodlette Frank Road.

NAVCEN: User was provided information on how to contact mapping software providers to update their location details.		 Mapping Issue 12/20/2019
269 12/03/2019 MELLITAH,LIBYA Marine USER: While approaching Mellitah Port,Libya both GPS lost signal and was showing No fix. GPS was receving Signal Intermeditely and again losing at a interval of 5 Minutes. Restarted both GPS,dignosis carried out Still GPS sensor was unable to hold on to Satellies. After anchoring at Melllitah port and after 6 hrs the GPS lost Signal ,On restarting the GPS,No error was showing and Both GPS working Satisfactorly

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 12/20/2019
267 11/29/2019 Baltimore Key Bridge Transportation USER: Use of any application, Waze, Maps, Google Maps could not connect to GPS from the Key bridge to East of the Key bridge.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. 		User Equipment 12/20/2019
266 11/25/2019 Misurata libya Marine USER: Before arrival to Misurata Port, Libya about 15nm from shore DGPS signal becomes intermmitent. Until arrival to anchorage to port. We stayed 72hours on port and DGPS Signal still lost.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners. This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 12/20/2019
263 11/08/2019 Santa Ana - downtown Communications USER: For the day, the compass apps on the iphones, and the Garmin were all at about 93 ft accuracy. Usually all are at +/- 20. Navigation app kept losing us, sending us in circles, etc. The geocaching app on the phones also sent us in circles, with only +/- 93 ft accuracy.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

Many times in a downtown area when GPS does not have a clear sky view multipath errors are possible and likely. These errors can often cause both position and speed errors. We always recommend you ensure your equipment software is up to date, refer to your equipment manual or contact your manufacturer for further assistance.		 Other 01/28/2020
262 11/07/2019 Litchfield, CT Automobile USER: Was trying to get directions to North Haven, CT. Was told by apple maps and google maps that the address is not routable from this location tried many different other addresses, all with the same result. Powered off phone, powered back on, same result. Around 9:10 it started working again. Above times are times I am certain it was not working. This is the first time GPS has not worked for me. There is nothing wrong with the phone that I can tell, it is fully updated, had a full battery charge, was plugged into the charger in the car regardless.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other interagency partners.

NAVCEN can not verify function of applications or network service provider. We recommend letting your provider know about the issues you are experiencing. 		User Equipment 11/27/2019
265 11/04/2019 Mesa Transportation USER: I have had a disruption to all of my mail service. I do not know if there was a recent update to the GPS system. I have ordered packages from 4 different sources 2 of which I previously ordered from and had no issues. For some reason the Unit number sometimes shown in forms as Apartment is not coming up correctly and all of my packages are being returned. One of the companies I ordered from told me that the Unit number is showing as part of the street address. Was there a recent update that is causing this. I have had no problems with delivery up until the first of November.

NAVCEN: User provided information on how to contact mapping software providers to update their location details 		Mapping Issue 11/27/2019
261 11/03/2019 saudi arabia Automobile USER: Thousands of vehicle tracking GPS devices stopped detecting the GPS signal at the same time.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other interagency partners.

NAVCEN spoke with the equipment manufacturer and they stated that it is associated with the week number rollover and are working with customers.

NAVCEN recommended user to contact the manufacturer for additional assistance. 		User Equipment 11/27/2019
260 10/25/2019 Delray Beach Automobile USER: Vehicle Nav was unable to connect intermittently.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other interagency partners.

Reporting source stated he had GPS on another mobile device. Recommend user to contact the manufacturer for additional assistance. 		User Equipment 11/27/2019
259 10/22/2019 Port Suez Marine USER: While approaching Suez anchorage area at 0940 LT ( 1140 UTC/22-Oct-19 ) about 29 37.4N 032 33.7E POSN , GPS interference detected in both GPS . V/l GPS malfunctioned and BOTH GPS showed error no. 212 in alarm window , Loss of position , NO FIX. As per Makers manual GPS error Reason : Interfering object between satellite and GPS receiver . Vsl called nearby vsls in vicinity to confirm if they also received the same error , Vsl STI ELYSSES replied even they got the same error for GPS . Vessel GPS operationalizes when vessel entered Suez Canal at 1105 LT (0905 UTC) / 23-Oct-19 at 29-56.5 N /032-34.3 E

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source has not responded		 Unknown Interference 11/27/2019
264 10/22/2019 many US locations Transportation USER: Provides telematics devices to the Transportation industry. We use GPS to provide location data for commercial vehicles and leverage this to enable Electronic Logging Devices for them to work correctly and record drivers hours of service information to ensure they are compliant. We had many devices working correctly, then suddenly on October 22 2019 we started losing GPS position data and this has been sporadic ever since. Logs showed that there were 13 SAT in view. But the data said zero satellites tracked. This has not been seen before. What event occurred that might have made this happen?

NAVCEN: User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information, including any information from their equipment manufacturer but the reporting source has not responded.

Reporting source responded and stated that it was a software issue. 		User Equipment 11/27/2019
258 10/21/2019 Off Misurata, Libya Marine USER: Initial signal loss was at 04:30 LT which lasted for about 4 hrs. Now signal is intermittent.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source has not responded		 Unknown Interference 11/27/2019
254 10/15/2019 Poland/Europe Other USER: We are company who sells GPS devices. From morning most our customers reports(from polnad and europe) a problem with GPS operation. GPS does not fix position.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other interagency partners.

NAVCEN recommends further evaluation of software and check availability of GPS with other receivers.

Update: Reporting source responded and stated it was a sopftware issue.		 User Equipment 10/24/2019
255 10/15/2019 Piraquara, Brazil Aviation User: We lose the signal over a prison. Nearest mountains and dangerous area.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

NAVCEN recommends the reporting source contact the country communications agency for further information in that area.		 Unknown Interference 10/24/2019
256 10/14/2019 North Side of West Bay bridge Other User: Below is the customer service response regarding the failure of the unit to properly display my location or lock onto the collar. I am so sorry you are having problems with the GPS lock, I have some good news and I have some bad news. The good news is it is not the equipment. The bad news is we are currently experiencing issues with the satellites that we use for our systems. This is not just affecting us but other GPS devices as well. Our engineers are diligently testing and working to find a resolution. As soon as one is found, I will gladly let you know. I am so sorry for all the issues you have had." I am searching to confirm this "satellite problem" therefore my reason for this report. I am eager for a response as soon as possible Please.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other interagency partners.

Update: NAVCEN spoke with the reporting source and he acknowledge that he had GPS on other devices. Equipment manufacturer has stated that they are currently working on the issue. 		User Equipment 10/24/2019
257 10/14/2019 Cedar Park Automobile User: Happened on several mobile devices. All navigation apps do the same thing, it says "No GPS, Showing Approximate Location" I have reset location, privacy and network settings, power cycled device, updated software and still the issue remains.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

We recommend the user to contact their service provider for assistance. We requested additional information, including any information from their provider but the reporting source has not respond. 		Insufficient Information 10/24/2019
252 10/05/2019 Mt. Vernon, Baltimore, MD, continuing northbound on rt 83 User: On two separate cellphones, the GPS keeps having difficulty pinpointing the exact location. It will start to give the right directions, then think we are on another road and start giving directions for places nowhere near us.

NAVCEN: Issue was specific to one application on the phone while other applications still worked. User was provided information on how to contact mapping software providers to update their location details. 		Mapping Issue 10/11/2019
250 10/01/2019 Xanthi Surveying User: Initially, the device observes many satellites. Then, accidentally the GPS device does not have none of them (and it seems that there is no satellite above).

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other inter agency partners.

Update: After further investigation reporting source determined the equipment required a software upgrade.		 User Equipment 10/11/2019
248 09/08/2019 Shanghai, China Marine User: After docking in Shanghai, China the GPS receiver was displaying incorrect position, speed and an audible beeping alarm. We believe it was due to interference.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area.

NAVCEN recommends to report the issue to the nearest communication authority. We also recommends all users share their reports with their equipment manufacturer. This real world feedback can help manufacturers improve products by enabling them to operate in an environment where GPS interference is present.		 Unknown Interference 10/11/2019
242 09/02/2019 Shanghai, PRC Marine User: Vessel is at berth working cargo in Shanghai experienced GPS issue.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other interagency partners.

User encouraged to report the issue to the nearest communication authority.

We recommend all users share their reports with their equipment manufacturer. This real world feedback can help manufacturers improve products by enabling them to operate in an environment where GPS interference is present. 		Unknown Interference 10/11/2019
243 09/02/2019 Shanghai, PRC Marine User: Vessel fast at container terminal working cargo. Speed and sometimes position jumping on all three units plus cell phone applications.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area.

NAVCEN recommends to report the issue to the nearest communication authority. We also recommends all users share their reports with their equipment manufacturer. This real world feedback can help manufacturers improve products by enabling them to operate in an environment where GPS interference is present. 		Unknown Interference 10/24/2019
240 08/30/2019 Aarhus, Denmark Timing We observe pps (pulse per second)outages on several installations in Denmark, Iceland and Finland. The issue started around the 30 of July. Probably earlier but not that frequent. The number of outages have increased now and become severe. We observe 4 time windows during the day at which outages occur at all installations at most days since 30 of July: 03:04 - 04:06 07:37 - 07:49 18:23 - 18:53 21:08 - 21:30 (all times in UTC) The start time of the outages drifts by about 4 minutes at each day compared to the previous day.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User is working with manufacturer.

Manufacturer has provided an update to NAVCN stating that they have issued and tested a firmware update to correct the outage. 		User Equipment 09/11/2019
247 08/21/2019 South of Mobile, Alabama Marine USER: For a period of about five minutes, three independent GPS systems lost position fix. Restarting the units did not correct the issue. Near the end of the event, each device acquired and lost position fix for a few seconds. Afterward all regained stable position fix. Outages like these have been occurring regularly, typically between 18:00-19:30 UTC.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. The GPS disruption report appears to correlate with a nominal rise in DOP over the disruption location, however, there are no indications that this would result in the loss of GPS signal that was experienced by the user. The GPS Operations Center can only verify constellation performance in the disruption location at the specified time, and cannot investigate receiver issues experienced. The GPS operations center recommends contacting the receiver manufacturer for further troubleshooting. 		User Equipment 11/27/2019
239 08/19/2019 Manassas Communications User: Manufacturer of portable Iridium devices with built-in GPS receivers. Over the last week we have experienced intermittent but regular interruptions of our GPS reception.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or inter-agency partners.

NAVCEN requested additional dates and times of possible outages.

User no longer experiencing outage.

UPDATE Interference came back but reporting source was able to determine the cause. 		Unintentional Interference 10/11/2019
236 08/18/2019 Spring, TX Automobile The time and date in the vehicle have gone blank, in addition, the GPS signal the vehicle is receiving shows that it is receiving the date of 12/31/1969 at 13:59:59. This has been going on for a few days, but the date and time remain the same and are not changing.

NAVCEN: As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance. Requested additional information, including any information from their equipment manufacturer but the reporting source did not respond.

NAVCEN spoke with manufacturer and they are developing a fix. 		User Equipment 08/27/2019
237 08/18/2019 Albany, New York Automobile User: It appears that many, possibly vehicles lost date and time functionality due to a GPS satellite issue. Other manufacturers may be impacted, but this is unknown.Sample of impacted customers: https://www.cargurus.com/Cars/Discussion-t73000_ds1053034

NAVCEN: User encouraged to contact their equipment manufacturer for assistance. This is an ongoing issue with the vehicle clocks no correlating reports on other GPS systems. Many users have indicated that a factory reset may resolve the problem.

NAVCEN spoke with manufacturer who stated it is because of week number rollover and they are sending out updates.		 User Equipment 08/27/2019
238 08/18/2019 Austin, Tx Automobile User: Vehicle clock gets time from GPS. Clock went blank and has yet to recover. Called dealer, and they said there is a known issue with satellite.

NAVCEN: User encouraged to contact their equipment manufacturer for assistance. This is an ongoing issue with the vehicle equipment. There has been no correlating reports on other GPS systems. Many users have indicated that a factory reset may resolve the problem.

NAVCEN: Manufacturer acknowledged the issue is likely related to the GPS Week Number Rollover. They are working on a firmware update to correct the issue. 		User Equipment 09/11/2019
235 08/14/2019 Alexandria, Egypt Marine -Disruption was steady and consistent for the first period (60min.) followed by a series of brief, intermittent losses of DGPS -DGPS was observed tracking between 0 (ZERO) and 4 (FOUR) satellites during the disruptions. -VHF voice polling of other (foreign flag) ships in close vicinity confirmed that they too were experiencing similar outages -Only 1 (ONE) DGPS unit was affected, confirmed same for other vessels in vicinity.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond. 		Unknown Interference 08/27/2019
233 08/12/2019 EL SHAIKH NOBARAK, EGYPT Marine GPS CONNECTED DEVICES (GYROCOMPASS, CLOCK) EXHIBITED FAILURE FIRST, FOLLOWED BY POSITION FAILURE ON GPS UNITS THEMSELVES. APPROXIMATE EXTENT OF INTERFERENCE/FAILURE - 60 MINUTES INTERMITTENT.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond. 		Unknown Interference 08/27/2019
234 08/12/2019 Mobile, Alabama Marine Over a period of about ten minutes, three independent GPS systems (two MX612, and one 7000 118-530) lost position fix. Restarting the units did not correct the issue. At the end of the event all three systems regained a stable position fix.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

We recommend all users share their reports with their equipment manufacturer. This real world feedback can help manufacturers improve products by enabling them to operate in an environment where GPS interference may be present. NAVCEN requested additional information, including any information from their equipment manufacturer but the reporting source did not respond. 		Unknown Interference 08/27/2019
232 08/06/2019 South of Sicily in the Mediterranean Sea Marine When No fix alarm was showing, the HDOP values were fluctuating between 1.2 – 1.5

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 08/19/2019
229 08/03/2019 Karachi Communications Blue dot is blue dot jump around and blue is 100 meter away.

NAVCEN: User provided information on mapping software.		 Mapping Issue 08/07/2019
230 08/01/2019 East of Malta Marine User: 01 Aug 2 GPS receivers have lost sat signal completely. 2 to 4 satellites started to be visible within next 3 hrs. All GPS receivers become fully operational only after 6 hrs from the beginning of interference. All ships in VHF range reported similar case at that time.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 08/19/2019
226 07/24/2019 Sabratha Oilfield - Offshore Libya Marine Loss of all sat positioning reference systems. Problem started when sailing from Malta. Total loss of GPS and DGPS signals (provided by Veripos). Other vessels experience same problem. Time period w/o receiving signals seems to be erratic. From 10 minutes to several hours. No pattern. Seems to be jamming. Satcom systems also affected. Service providers suspect military interference or equivalent.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source responded with manufacturer stated issue may be from local interference. 		Unknown Interference 08/09/2019
222 07/23/2019 AT SEA Marine USER: VESSEL NAME NEREUS ISLAND

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment and determined it to be healthy, stable and robust during that time. It continues to provide precise positioning navigation and timing information to military and civilian users around the world.

This report is similar to that in the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean located on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. We also recommend all users share their reports with their equipment manufacturer. This real world feedback can help manufacturers improve products by enabling them to operate in an environment where GPS interference is present. NAVCEN requested any additional information, including communication authority or equipment manufacturers response details. Reporting source did not respond. 		Unknown Interference 08/07/2019
221 07/18/2019 New Zealand Aviation User: Airways New Zealand is experiencing dropouts of ADS-B ground stations for 2-3 hours yesterday and has started again today, commencing around 0300 UTC.Sites report.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

We recommend user work with eqipment manufacturer and verify software application. NAVCEN requested additional information, including any information from their equipment manufacturer. Reporting source is working with manufacturer.		 User Equipment 08/09/2019
220 07/16/2019 Port of Shanghai Marine User: Upon arriving to dock in Shanghai, a U.S. flagged MV master checked ECDIS at the AIS to see if their berth was clear. Another ship on the berth appeared to be in the channel making 7 knots (kts) speed over ground (SOG), but then disappeared from AIS. A few minutes later she was back and at the dock, then underway again, 5 kts, 2 kts, 0 kts, in the channel, then back at the dock, then gone. This pattern repeated multiple times. It turned out the other ship was actually all fast the entire time. Later, while the MV was turning in the river off the same berth, both GPS units lost their signals, no position, no SOG, multiple alarms on various integrated equipment. The GPS signal would come back for a minute and then be lost again. This continued to the dock and has continued. The GMDSS GPS is experiencing the same thing. Master suspects GPS signal jamming is occurring at this berth. Vessel checked all antennae connections – all connections are secured and dry. There have been no other issues with these units.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to report the issue to the nearest communication authority.

We recommend all users share their reports with their equipment manufacturer. This real world feedback can help manufacturers improve products by enabling them to operate in an environment where GPS interference is present. User acknowleded local interference likely the cause of the issue.		 Unknown Interference 08/09/2019
216 07/11/2019 Jodhpur User: Gps receiver in my mobile showing my position 80 km away from true location ..

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. NAVCEN requested additional information, including any information from their equipment manufacturer but the reporting source did not respond.		 Unknown Interference 08/07/2019
217 07/10/2019 PORT SAID, EGYPT Marine User: Complete loss of GPS signals this afternoon when exiting the Suez Canal, 10 July 16:03 LT from km 4.5 Lat 31-12.5N Long032-20.4, just as Suez pilot was disembarking. Outage lasting for approximately 90 minutes. The signal came back intermittently at 17:28 LT Lat 31-26N Long 032-24E, and was stable by 18:00.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment and found space weather may have impacted GPS performance at the location. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

This report also correlates with the U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 07/22/2019
215 07/08/2019 La Paz, Bolivia Other User: Problem about 1024 weeks start to appear on July 8, 2019 instead of April 6, 2019.On July 8, 2019 the GPS reports date November 22, 1999. Hours, minutes and seconds are correct.

NAVCEN: User acknowledged the issue is likely related to the GPS Week Number Rollover. They are working with their equipment manufacturer and expect a firmware update to correct the issue. 		User Equipment 07/22/2019
214 07/03/2019 Libya Marine USER: No fix

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or inter-agency partners.

User encouraged to report the issue to the nearest communication authority.

NAVCEN requested additional information, including any information from their equipment manufacturer but the reporting source did not respond.		 Unknown Interference 07/22/2019
231 07/01/2019 Santo Domingo Communications Mobile devices struggiling to fix position.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. Requested additional information, including any information from their equipment manufacturer but the reporting source did not respond.		 Unknown Interference 08/19/2019
212 06/26/2019 PORT SAID, EGYPT Marine User: SIGNAL INTERRUPTION HAPPENED AS WE WERE DEPARTING PORT SAID NORTHBOUND INTO THE MED. INTERRUPTION CONTINUED INTERMITTENTLY FOR APPROX. 2 HOURS.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond. 		Unknown Interference 07/11/2019
211 06/25/2019 Madrid User: I have detected that GPS SVN49 (IIRM7) has been broadcasting an BPSK signal modulated with alternating 0 and 1 at the L1 frequency. The signal is clearly visible on a spectrum analyzer as two peaks at 511.5kHz from the L1 centre frequency, whenever SVN49 is in view. This has been ongoing over the last few days and continues. I have read that this satellite was decommissioned in 2011, so I wanted to ask if this is normal (I just noticed its signal by chance during some unrelated tests), if it is due to some tests with the satellite or if its an anomaly.

NAVCEN: To confirm this is not a problem with the GPS broadcast signals, NAVCEN contacted the GPS Operations Center who stated the signal you detected represents the current nominal status for SVN49.

SVN49 exhibits a known distortion due to internal multipath resulting in degraded performance. It is currently set in an "unhealthy" state and removed from the constellation to prevent any adverse effects on users. The description of the signal resembles the non-standard code the satellite will display when not in use for other testing purposes. 		None 07/12/2019
210 06/20/2019 Sabratha Field - Offshore Libya Marine User: Total loss of all GPS and GLONAAS satellites linked to both our DP PRS and navigational DGPS. All vessels in report same issues.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to report the issue to the nearest communication authority.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information, including any information from their equipment manufacturer but the reporting source did not respond.		 Unknown Interference 07/01/2019
227 06/20/2019 TRIPOLI, LIBYA. VALLETTA MALTA Marine User: CENTRAL MEDITERANNEAN CONTINUOUS DISRUPTION BETWEEN LIBYA AND MALTA.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from interagency partners.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference in the Mediterranean on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source did not respond.		 Unknown Interference 08/19/2019
206 06/12/2019 South of Odessa / Ukraine Marine User: GPS signal found to be disrupted, with all due consequences for vessel navigation equipment.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information, including any information from their equipment manufacturer but the reporting source did not respond. 		Unknown Interference 07/01/2019
209 06/12/2019 Carson City, NV Transportation User: I detected a few transient RFI events at CORS DOT1 across JDAYs 163 - 164 (Jun 12 - 13). I compared the events at other CORS sites in and around the Public Testing notice for Nellis RFI; these do not correlate to RFI detected at Las Vegas CORS sites on same days. The events occur around 0743 - 0830 for roughly 20 minutes. The SNR / C/N0 measurements appear indicative of a low-powered emitter without line-of-sight to other CORS near Carson City, NV. Trailing spike indicates possible noisy / cheap RF device. Happy to share my data, screen shots, plots. I am located in Colorado Springs, CO and use the site in NV remotely. Have contacted site owners and will continue observations.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

Report Closed. 		Unknown Interference 08/07/2019
207 06/11/2019 Cumberland, MD Transportation User: Over the past week, we have been experiencing issues with our GPS system reporting a high HDOP value. We have a system installed on our locomotives called Positive Train Control (PTC) that uses GPS to validate a train location and requires a certain level of accuracy from GPS. We have seen the HDOP value rise from an average of 0.9 to 2.2 in the past week. We are inquiring if there have been any changes made that could account for the sudden increase in HDOP values?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. HDOP average at the point of interest was reviewed between 3 and 11 June and found to be 1.5. There were times when the maximum HDOP value for the day reached 2.5, but only for a few minutes. These values are typical historically for the area. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information, including any information from their equipment manufacturer but the reporting source did not respond.

Update: User worked with the equipment manufacturer and resolved the issue.		 User Equipment 08/19/2019
205 06/03/2019 Goodyear, AZ Other User: Off Road travel, outage cleared

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information but the reporting source did not respond.		 User Equipment 06/12/2019
208 06/02/2019 Oklahoma Transportation User: Equipment on railroad locomotives is showing diminished position accuracy. Since June 2 across a fleet of several thousand locomotives in the US the positional accuracy is decreasing. This decrease is documented by lower average # of satellites received and higher HDOP values reported by the receiver. An alarm is generated by our system when the HDOP reported by the receiver in the GPGGA message stays above 2 for 10 minutes or more. While admittedly not completely accurate, this makes a convenient marker for diminished accuracy. This alarm was generated by 6 trains in Oklahoma June 2nd but has been seen from the east coast to the west coast in the days since. A similar by possibly not related issue occurred in the Midwest December 7 of 2018 with roughly 500 trains generating this error over the day. The alarms did not repeat until June 2nd. Previously this alarm was not seen in 2016-2018. In addition, the system can mark when the train passes certain surveyed locations along the track like a wayside signal. If the GPS location of the train is not within a certain distance from the surveyed location when passed, then another alarm is generated. This alarm was raised less than 5 times in the first 4 months of 2019 but has been raised 15-20 times in June so far. This appears to be another indication that the accuracy of the position fix has diminished. There have been no changes to the GPS receiver firmware in the last 2 – 3 years. We have been unable to correlate this diminished accuracy to reported satellite outages. Further information in graphical or spreadsheet format is available.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information, including any information from their equipment manufacturer.

User is working with equipment manufacturer.

Update: User worked with the equipment manufacturer and resolved the issue.		 User Equipment 08/19/2019
204 06/01/2019 Cornwall, CT Other User: Prior to this main outage, earlier in this trip there were a few brief blips of erroneous positions, starting in Peekskill NY, showing erroneous position. I have used this GPS for over a decade and never saw it have problems like this in wide open spaces. I had tried turning the GPS off and forcing it to "re-learn" the satellites. That did not help. It came up with the (presumably) same three and reporting weak signal. As I continued my travel it started tracking again at 14:37 positionin N41 59.508 W73 19.817

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information but the reporting source did not respond.		 User Equipment 06/10/2019
228 05/30/2019 Tokyo, Japan. Santa Rosa, CA Timing The receiver logged anomalous time of week being received from PRN 25 that was over 1000 seconds in the future beginning at WN 2555, TOW 429012 when PRN 25 reported WN 2555, TOW 430068. This persisted for over 4 minutes with the TOW from PRN 25 frozen at 430068. It was observed at multiple locations in Japan and also in California. PRN 25 was being tracked both in Japan and California at the time of the anomaly.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

NAVCEN requested additional information, including any information from their equipment manufacturer but the reporting source did not respond. 		User Equipment 09/11/2019
203 05/23/2019 San Mateo, CA to Palo Alto, CA Automobile User: Both built-in and mobile phone GPS indicated that I was in a different area than I was in while traveling between Foster City, CA and Redwood City, CA. Additional info: My satellite radio was offline at this time. By the time I reached San Jose, CA, systems were functioning normally again.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information but the reporting source did not respond.		 User Equipment 06/10/2019
201 05/20/2019 Port Said, Egypt Marine User: Problem commenced when vessel arrived to the above mentioned position (this is Sea Terminal, vessel is moored alongside of Sea Buoys)off Port Said. First day 20/May/2019 it was continuously, every 5 mins GPS position lost. Second day, 21/May/2019 frequency of position lost reduced to very 20 mins position lost. Vessel is equipped with 2 DGPS units and fault caused on both of them. Following alarms / warnings observed on the screen during subject DGPS fault: 1. Alarm, No fix; 2. Alarm, HDOP over. End of report.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. Reporting source responded the issue has resolved. 		Unknown Interference 06/03/2019
202 05/17/2019 Lancaster, CA Other Synopsis: 4 [equipment] were powered on between approximately 2030Z and 2100Z on 17 May 2019 in Bakersfield, CA. They were then flown aboard private aircraft enroute to Laughlin, NV. Despite being in what should have been a "hot start" mode, none achieved a GPS fix until 2200Z. Of particular note, three of the units achieved lock within 30 seconds of each other, despite being separated geographically by almost 100 miles. This seemed to suggest an external factor may have been involved. Detail: Five [equipment] units (SiRF Star III chipset) were used to log positions of aircraft participating in an air rally event. Note the [equipment] is a retail data logging "puck" being used in the aircraft for supplemental logging, not an air navigation application. The units log NMEA GPGGA sentences at 1 second intervals when a fix is available, but do not include the satellite count. Participating aircraft flew from Hayward, CA (HWD) to Bakersfield, CA (BFL) to Laughlin, NV (IFP). Units were powered on prior to takeoff and turned off after landing. During the first leg from HWD to BFL, all units operated properly on board the participating aircraft. During the second leg, from BFL to IFP, four units were powered on between approximately 2030Z and 2100Z in Bakersfield, CA. Despite being in what should have been a "hot start" mode, none achieved a GPS fix until 2200Z. The powerup time and time and position of first fix for the units were as follows: Powered at 2100Z ; fix at 220019Z N34-48 W116-58 near Barstow, CA Powered at 2045Z ; fix at 220025Z N35-16 W116-07 near Baker, CA Powered at 2104Z ; fix at 220048Z N34-41 W117-24 near Victorville, CA Powered at 2026Z ; fix at 221536Z N34-53 W115-11 near Goffs, CA The fact that three units achieved a fix within 30 seconds of each other, while being separated geographically, and with varying (and excessive) times since startup, seemed unusual. The aircraft were all at an altitude of approximately 7000feet MSL. A fifth [equipment] was mistakenly left powered up throughout the ground stop at BFL, and logged a complete track. No other GPS anomalies were reported by participants. A [different model GPS unit] that was powered up at Bakersfield in the same timeframe acquired a fix immediately. I am aware that GPS interference testing was being conducted at Twentynine Palms that day (Flight Advisory 29PALMS 19-01), with the affected area encompassing the entire route of flight from Bakersfield to Laughlin. However, the testing was scheduled to be completed at 1300Z. While this issue is likely to be a manufacturer specific glitch, I am reporting it to see if any external factors may have been involved.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

Since the user acknowledged other equipment in the same aircraft operated normally, and we have no correlating information, NAVCEN encouraged the user to contact their equipment manufacturer for assistance. NAVCEN requested additional information and the user acknowledged the issue was their user equipment. 		User Equipment 06/03/2019
199 05/15/2019 Statesville, NC Transportation User: Traveling East on I-40 about 7:30pm EST. GPS location [on mobile phone navigation application] started instantly changing directions 30 or 45 degrees, running off road for 1/4 to 1/2 mile, then rerouting. The area was being prepped for repaving and crews were setting up. The issue continued until we were about 10 miles east of Statesville (about 15 miles from start). It happened again at another construction area between Mocksville and Winston-Salem, also at a construction site. and a third time entering Winston Salem (again a construction- repaving site.) It happened one more time during the drive - about 9pm EST east of Burlington, NC near Mebane, also in a repaving zone. I am concerned that new equipment to help the repaving contractors is interfering with the GPS receivers.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer or application developer for assistance. NAVCEN requested additional information, including any information from their equipment manufacturer or application developer. The user did not respond to our request.		 User Equipment 05/24/2019
200 05/15/2019 Larnaca, Cyprus Marine User: This is now a daily occurrence in this area. Apart from losing a reliable position, I also lose the ability to lock the yacht to a predetermined route, and more importantly, collision alerting through my AIS B transponder and [software]. If I cannot broadcast my position, then the system ceases to function. This is a major concern as I sail single handed to Israel, the Lebanon, and to Turkey. AIS is my primary watch method when I inevitably have to rest. The outage is always confirmed through 3 receivers plus my GPS [mobile phone] app which is very useful in proving that this is not an equipment malfunction, but genuine interference or jamming. Other yachts at Larnaca also confirm the problem. I took a video of the satellite status page on my [manufacturer] GPS which I can send you once I have the correct email address to send it to. This summer I have not made any long trips so far, so I am unable to establish the area affected. Thank you for your concern. This has to be stopped before someone has an accident.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area.

This report correlates with the U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN requested any additional information, including communication authority response details. User responded that the problem has cleared. They will contact their equipment manufacturer and report the outage to the nearest communication authority. 		Unknown Interference 05/24/2019
198 05/14/2019 Hawthorne, CA Law Enforcement User: For the past two days, our GPS receivers have been unable to obtain a GPS FIX in the area.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. NAVCEN requested additional information, including any information from their equipment manufacturer. The user did not respond to our request.		 User Equipment 05/24/2019
197 05/12/2019 Port Said, Egypt Marine User: While at anchorage near the entrance to the Suez Canal. The vessel [vessel name] ships staff started receiving a GPS failure alarm from their equipment.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

NAVCEN: This report correlates with the U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN asked if the user had contacted their equipment manufacturer. Reporting source did not respond to the request for additional information. 		Unknown Interference 05/20/2019
195 05/06/2019 Mitchellville, MD User: I drive a semi. GPS is out as well as my ELD.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User provided GPS screenshots that indicate no GPS received but no other information such as other devices with the same issue, or if the device has a clear view of the sky. User encouraged to contact their equipment manufacturer for assistance and asked to share manufacturer response with NAVCEN. User did not respond to request for additional information. 		User Equipment 05/15/2019
196 05/06/2019 Port Said, Egypt Marine User: DGPS Error was the message displayed.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

NAVCEN: This report correlates with the U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. NAVCEN asked if the user had contacted their equipment manufacturer or DGPS service provider. The reporting source did not respond to the request for additional information.		 Unknown Interference 05/16/2019
225 04/30/2019 Magnolia Texas Automobile Clock display blank. All clock settings blank

NAVCEN: As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance. Requested additional information, including any information from their equipment manufacturer but the reporting source did not respond.		 User Equipment 08/19/2019
192 04/27/2019 Damietta, Egypt Marine User: Unable to acquire more than 2 sats, weak signal on sats acquired. 1 Additional GPS of same make and model with antenna located on other side of vessel is receiving normally.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area.

See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. User did not respond to request for additional information. 		Unknown Interference 05/06/2019
191 04/25/2019 Port Said, Egypt User: [Vessel] was effected by the repetitive loss of GPS signal, affecting radar, ais, and gyro input. [Vessel] location was the Port Said EGYPT anchorage. This occurred from 1800 24 April, thru 0330 25 April, while my ship and numerous other ships were attempting to transit the Suez Canal.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area.

See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. User did not respond to request for additional information. 		Unknown Interference 05/06/2019
190 04/24/2019 Departure Limassol, Cyprus Marine User: During navigation from Limassol, Cyprus to Haifa, Israel, both GPS (1&2) signals were lost. During early morning signal went back but both GPS are showing wrong date (09 September 1999).

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance. User worked with their equipment manufacturer, replaced equipment, and the issue has resolved. 		User Equipment 04/30/2019
188 04/22/2019 Liege - Grace-Hollogne Transportation I have been heading from Grace-Hollogne (Belgium) to Frankfurt am Main (Germany) in my truck and issue of GPS fix occur. These errors have I been noticed on my smartphone and on my car-mounted navigation. After 2hours and 34 minutes I havent noticed any GPS fix only assisted GPS "jumps" on my smartphone between signal points from my operator. On [navigation] device screen sometimes blink a "searching" icon but it gets any better. Now I am standing on parking place on highway and still havent my GPS signal uplink.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

User encouraged to report the issue to the Belgian Institute for Postal services and Telecommunications and the Federal Network Agency (Bundesnetzagentur) in Germany. User did not respond to request for additional information. 		Unknown Interference 05/06/2019
186 04/15/2019 Abilene, TX Surveying User: On 4/15/19 - We were calibrating our GPS equipment used to perform highway construction when we began having issues with the accuracy of the GPS. We considered this to be a calibration/file issue and ran multiple troubleshooting protocols to fix the issue, however, after many attempts to correct the problem we were unsuccessful and headed home for the night.

4/16/19 - We began working again the morning of the 16th to resolve the lingering issue. After setting up our GPS equipment the number of satellites began to drop until eventually our equipment was not tracking any satellites. We are in the vicinity of an aiport and an Air Force base. Prior to this incident we were using a different frequency equipment which we found was supposed to have issues with the frequencies being used at the AFB/Aiport. We changed our equipment to run on 900 mhz frequency to avoid any interference and the equipment was running as it should. Then we began having issues as listed above. We have had a certified troubleshooter of equipment on site and they are in agreement that there is some type of interference or jamming occurring.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

Interference appears to be at 900MHz. User encouraged to contact the FCC Jammer Tip Line to report the suspected interference. User did not respond to request for additional information. 		Unknown Interference 04/30/2019
187 04/15/2019 Abeokuta, Nigeria Surveying User: The GPS Receiver tracked fine. On downloading there are evidence of recording by the size of data acquired. On processing, the error is failed in single positioning. The coordinate is 0 for both Latitude and Longitude. This occur for different receivers and on many days.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance.

User did not respond to request for additional information. 		User Equipment 05/14/2019
185 04/14/2019 Warsaw, Poland Transportation User: Since Sunday 16.04.2019 our devices have a problem with number of satellites in Poland. At the moment, more than a thousand devices can see only 2-3 satellites. Can you tell us where the problem is?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. Suspect GPS Week Number Rollover issue.

User acknowledged the issue is likely related to the GPS Week Number Rollover. They are working with their equipment manufacturer and expect a firmware update to correct the issue. 		User Equipment 04/24/2019
183 04/09/2019 Apuarema, Brazil Surveying User: "precisamos trabalhar e temos apenas esses aparelho,grato"

NAVCEN made several requests for additional information and received no response. As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance. 		User Equipment 05/14/2019
184 04/07/2019 Tehran, Iran Transportation User: It is something like a big noise. Since one week before all off car GPS modules involved. The problem is the date, location and clock is correct but date is 2099. today it is 29-8-2099. This strange mistake was reported from lots of cities in Iran.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance.

User did not respond to request for additional information. 		User Equipment 05/14/2019
181 04/06/2019 Fahud, Oman Surveying User: Our geophysical recording instruments was unable to get sufficient number of elevated GPS satellites intermittently on 6th April 2019 for time correction.Though we have communicated to our clients but it is necessary to get some information from GPS about disruption in this area. Kindly confirm.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance. User did not respond to request for additional information. 		User Equipment 05/14/2019
180 04/05/2019 Oulu, Finland Communications User: GPS Week Number Rollover expected on April 6th, 23:59 (GPS time). It appears GPS almanac changes were applied the day before affecting some GNSS equipment before the GPS WNRO. We were not prepared for the GPS WNRO prior to April 6th. Now we must hope that actual GPS week number rollover event will fix the situation. What changed and when did the changes happen?

NAVCEN: The U.S. Air Force points to Interface Specification IS-GPS-200, paragraph 20.3.3.5.2.2, Almanac Reference Time, which states: "The almanac reference time, t(oa), is some some multiple of 2(12) seconds occurring approximately 70 hours after the first valid transmission time for this almanac data set (reference 20.3.4.5). The almanac is updated often enough to ensure that GPS time, t, shall differ from t(oa) by less than 3.5 days during the transmission period." They go on to point out "For this reason, beginning late on JDay 094 [April 4th], the GPS constellation began, one satellite at a time, broadcasting almanacs with almanac reference times which, when un-truncated as necessary, translate(d) to a calendar date of 7 April 2019 (after the associated 1024-week rollover), correctly, and IAW IS-GPS-200."

User acknowledged the problem is related to the how their equipment is handling the GPS Week Number Rollover.

Additional user questions forwarded to interagency partners. Response to user questions provided to the user. The user has not requested additional information. 		User Equipment 06/03/2019
179 04/04/2019 United States Communications At roughly 8:45 PM CST lost GPS Sync to various cell sites around the US. The common GPS is trend is dual cones feeding sync to UMTS and LTE technologies. To mitigate the issue Field Technicians have removed one of the GPS cones and have a master sync from LTE feeding UMTS. There was no back office or architectural changes to our network during this time that would have caused this failure. We are curious if there were any changes made in preparation of the GPS System rollover slated for tomorrow April 6th that may have affected the base stations to lose sync.

NAVCEN: The U.S. Air Force points to Interface Specification IS-GPS-200, paragraph 20.3.3.5.2.2, Almanac Reference Time, which states: "The almanac reference time, t(oa), is some some multiple of 2(12) seconds occurring approximately 70 hours after the first valid transmission time for this almanac data set (reference 20.3.4.5). The almanac is updated often enough to ensure that GPS time, t, shall differ from t(oa) by less than 3.5 days during the transmission period." They go on to point out "For this reason, beginning late on JDay 094 [April 4th], the GPS constellation began, one satellite at a time, broadcasting almanacs with almanac reference times which, when un-truncated as necessary, translate(d) to a calendar date of 7 April 2019 (after the associated 1024-week rollover), correctly, and IAW IS-GPS-200."

As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance. User did not respond to requests for additional information. 		User Equipment 05/14/2019
178 03/28/2019 None provided User: WE are a business that has been in the same location for over 20 years yet, GPS/MAP QUEST cannot seem to locate. It sends our clients to other locations across town.

NAVCEN: User provided information on how to contact mapping software providers to update their location details.		 Mapping Issue 04/24/2019
176 03/19/2019 Pireaus, Greece Other User: GPS signal lost has been report by other vessels in the vicinity.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

User encouraged to report the issue to the Hellenic Telecommunications and Post Commission.		 Unknown Interference 04/16/2019
175 03/18/2019 Madrid, Spain Other User: At 10:29PM UTC+1 03/18/2019 we have detected alarms in a lot of GPS of our network. We saw GPS with more than 10 satellites when in most cases have 6 or 7 satellites. Could you check if you detected any incidence at this time?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

User encouraged to report the issue to the Comisión Nacional de los Mercados y la Competencia.		 Unknown Interference 04/16/2019
174 03/14/2019 Redmond, WA Other User: multiple days observed a disruption in the morning hours in this vicinity. .GPX file is available. I run this area often and only see it in the morning.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

NAVCEN forwarded user data to the Federal Communications Commission Operations Center. FCC pointed out "it was likely that the [user device] was influenced from natural effects such as tall buildings and dense tree in that area. These factors (heavy foliage and tall buildings) reduce or completely block GPS satellite signals. In addition, many tall buildings in that described area also created a multi-path so that GPS signals bounce off buildings before it reaches the [user device]."		 User Equipment 05/14/2019
172 03/07/2019 Dongguan, China Marine User: All GPS above lost position at the same time. Captain confirmed that his AIS showing China flags vessels only – probably they are using Chinese positioning system BeiDou

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

User encouraged to report the interference to the nearest communication authority. 		Unknown Interference 04/16/2019
193 03/01/2019 Tripoli, Lebanon Surveying User: we tried to relocate receiver and Antenna to another town but same performance (no GPS and having 7 to 10 GLONASS) we had another stations covering whole Lebanon and working fine

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User equipment suspected. User encouraged to contact their equipment manufacturer for assistance. User did not respond to request for additional information.		 User Equipment 05/08/2019
169 02/13/2019 Beirut, Lebanon Marine User: The problem started at 13.02.19 / 0326 UTC , but at 0512 UTC the connection was restored till 0858 UTC. From this time the interference is continuously till present with a few times for only a few minutes no interference.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

See U.S. Maritime Advisory 2018-014-Eastern Mediterranean Sea-GPS Interference on the MSCI Portal

User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
168 02/09/2019 Hodeidah, Yemen Marine User: VESSEL LOST SIGNAL FOR A PERIOD OF 10 MINUTES. AT 0200 LT FULL DGPS SIGNAL RESUMED WITH NORMAL FUNCTIONALITY. I DID NOT NOTE WHICH SATELLITES WERE BEING TRACKED.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

See U.S. Maritime Advisory 2018-014-Eastern Mediterranean Sea-GPS Interference on the MSCI Portal

User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
218 02/01/2019 Global Surveying User: Thanks to Navigation and Timing Monitoring Facility. Since the begining of February we received several NANU reporting unscheduled outages of a few minutes for some GPS satellites. NANU 2019020, 2019026, 2019085, 2019086, 2019091, 2019093, and 2019095. For each NANU we analyzed rinex navigation and measurement files from stations in visibility of the satellites. In every case the satellites were healthy according to their broadcast ephemeris data. We never saw any measurement gap bias or drift that could be linked to a clock problem and we could not see any power drop. When the satellites were monitored by a SBAS we did not see any problem with the satellites. Could you confirm the nature of the outage and the impact on the receivers? We would like to know our receivers behaved. As for the SBAS it is important to know if they have sent correct information. SBAS users could have used the satellites despite the outages and it could have led to a potentially hazardous situation. If you need additional information concerning our analysis please feel free to contact us.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment and determined it to be healthy, stable and robust during that time. It continues to provide precise positioning navigation and timing information to military and civilian users around the world.

NANU in question were sent as a precautionary measure. Information that was received from these satellites was still accurate. 		None 07/22/2019
170 01/11/2019 United States Surveying User: Observation of GPS NANU times in relation to the time satellites are set to unhealthy do not match past NANUs and satellite status. What time should be used? The time listed in the NANU, or the time the satellite was set unhealthy?

NAVCEN: The GPS Operations Center provided the following response: In reference to your question, no maintenance activities were initiated prior to the SVs being set UNHEALTHY. Moving forward, the GPS Master Control Station will work to ensure the NANU more closely tracks the exact time the SVs are set UNHEALTHY to avoid misconceptions. Again, thank you for bringing this matter to our attention.		 Other 05/07/2019
163 12/04/2018 Denver, CO Research User: For the past several days I have been picking up PRN 4 (which does not exist AFAIK) intermittently, always with no elevation or azimuth in the NMEA (because not in atlas I would guess). Duration from a 1s to 1.5h, starting around 0600MST and stopping around 2000MST.

NAVCEN: PRN4 is being used to test SVN36. This testing was published in NANU 2018042. "ON APPROXIMATELY 10 OCT 2018 SVN36 WILL RESUME TRANSMITTING L-BAND UTILIZING PRN04. AT L-BAND ACTIVATION, SVN36/PRN04 WILL BE UNUSABLE UNTIL FURTHER NOTICE. ADDITIONALLY, NO BROADCAST ALMANACS WILL INCLUDE SVN36/PRN04 UNTIL FURTHER NOTICE."

User encouraged to contact their equipment manufacturer for further assistance. 		User Equipment 05/07/2019
161 11/18/2018 Hadera, Israel Marine User provided no description of their problem.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

See U.S. Maritime Advisory 2018-014A-GPS Interference-Eastern Mediterranean and Red Seas for further information on this interference. MSCI Portal

User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
160 11/17/2018 Straits of Tiran Marine User: While on route toward Aqaba, Jordan, the vessel experience 03 incidents of loss GPS signal in the straits of Tiran. These 03 incidents lasted approx. 10 mins each. Event occurred between 0245-0440UTC.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/07/2019
167 11/15/2018 Washington State Timing User: Ongoing GPS failures since December 2017 at several sites. Was curious if other entities have reported outages in this area. Running redundant receivers and antennas at equipment sites. Technicians report different manufacturer equipment would fail at different times of the day. One timing receiver is experiencing more failures. Equipment alarms and requires manual reset to lock back on to GPS signal. Just really hard for me to think it is an equipment problem while three of them at different locations are doing this same thing.

NAVCEN: Equipment alarm records provided by the reporting source indicate similar errors across several timing units used by the reporting source and appear to be typical for this equipment. Errors were momentary (less than one second) with an average of approximately 90 momentary errors per site over the course of a year. Some equipment initiated more alarms, but there seemed to be no correlation between times, locations, or types of alarms. Redundant antenna and receiver systems did not alarm at the same time. The reporting source contacted their equipment manufacturer who identified a firmware issue. Reporting source now believes the problems are equipment issues and will provide more information if it becomes available.

The GPS Operations Center reviewed the GPS Constellation and Control Segment; there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. Coast Guard-operated Differential GPS did NOT observe GPS problems during 2018.		 User Equipment 05/07/2019
158 11/11/2018 Usuda (Japan), Maui (Hawai - USA) ... Other User: On the 11th and 12th of November 2018, the IODCs of the ephemeris/clock information transmitted by PRN32 from 11:33:30 (11 Nov) to 02:00:00 (12 Nov) were the same as the ones used on the 10th of November from 11:27:30 to 22:00:00 while the navigation data were different, in violation of the GPS ICD 200 IODC repetition rule (unicity over 7 days).

NAVCEN: Response from GPS Operations Center: The cause of the IODC repetition error was the result of an issue experienced with the ground control system. The problem has been corrected.		 ICD_Violation 05/08/2019
157 11/10/2018 Evansville, IN First Responder User: On 22 October the units began reporting a date of 11 March 1999. Time is correct, date is off.

NAVCEN: The GPS week number for both dates are the same (1000). User encouraged to contact their equipment manufacturer for assistance.

The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.		 User Equipment 05/08/2019
159 11/10/2018 North Sea Marine User: 17 Seconds before midnight on 10.11.2018 vessel experienced date jump. After midnight date changed again. Information collected with ZDA NMEA Sentence and wrong date were observed for approximately 24 hours until date changed back to actual date.

NAVCEN: Appears the GPS equipment incorrectly handling the GPS Week Number. Recommend user contact the equipment manufacturer for further assistance.

The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.		 User Equipment 05/08/2019
155 11/04/2018 35 - 04.4N, 034 - 48.1E Marine User: We have encountered more severe than normal GPS interference tonight. Shortly after 1800 local we lost all 3 GPS units, 2 for navigation, and the third within the AIS unit. Wanted to keep you appraised as again this is the most severe case yet. Certainly seems like a beam has hit this area. Thanks and will let you know once it clears some, or if it doesnt by the time we get to our destination. Thank goodness for paper charts.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/08/2019
154 11/01/2018 Haifa Port, Israel Marine User: Erratic GPS signal reception.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/08/2019
162 11/01/2018 Raleigh-Durham, NC Surveying User: The unit has ceased to display valid date and time information and reverted to the year 1999 without a reliable calendar day or clock time. This affects time/date of lunar and solar positions that were used for estimating positioning and also other conveniences such as sunset/sunrise. The date and time can be obtained from other sources that the handheld GPS easily. I contacted the manufacturer who denied any manufacturing defects and could not offer a solution except to obtain another device at my expense (out of warranty for several years). This is only reported for general information or recall, no response or solution is necessary unless there is a widespread recall or other issue that I am not aware of. Thru the last weeks even though the time/date was off the two dimensional lat/long have proven precise and the elevation above sea level continues to experience fluctuations as previously reported.(date/time of problem onset is estimated)

NAVCEN: There are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

The GPS Week Number advanced to 1000 on 22 October 2018. GPS Week Number in March 1999 was also 1000. User encouraged to contact their equipment manufacturer for assistance as it appears the GPS equipment is incorrectly handling the GPS Week Number. 		User Equipment 05/07/2019
153 10/29/2018 Strait of Hormuz Marine User: This vessel possesses two GPS units of the same make and model. Both units intermittently lost signal during the listed time period. The units regained signal by themselves in under 30 seconds after disruption. The incident occurred during a westbound transit of the Strait of Hormuz into the Persian Gulf. The last observed disruption occurred in the vicinity of 25-30N; 054-03E. The number of satellites (And the satellites in use) was not recorded during the period of disruption. Currently, both GPS units register 31 satellites and are obtaining a position via the following eight: 20, 21, 29, 10, 15, 26, 16, and 25. The vessel is still in the Persian Gulf as of writing this report. A contracted service company believes a military base in the area was jamming the GPS signal. The Iranian military scheduled gunnery exercises in the Strait of Hormuz on the 29th and 30th.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners.

User encouraged to report the issue to the Communications Regulatory Authority of Iran.		 Unknown Interference 05/08/2019
151 10/22/2018 Fort Collins, CO Timing User: Our devices experiencing fluctuation in GPS PPS nationwide. It is not restricted to one area or GPS model. Our tools rely on GPS PPS synchronization with 60 Hz power grid. Working devices all suddently failing starting 10/22/2018. Please advise!

NAVCEN: It appears the equipment is incorrectly handling the GPS Week Number. The GPS week number for both dates are the same (1000). User encouraged to contact their equipment manufacturer for assistance.

The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.		 User Equipment 05/08/2019
152 10/21/2018 Santorini, Greece Marine User: Ii is 7days that probably all [equipment] fishfinders do not synchronize date and time. All users experience the same malfunction. Please advise

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to report the issue to their equipment manufacturer and the Hellenic Telecommunications and Post Commission.		 User Equipment 05/08/2019
148 10/16/2018 Leesburg, VA Transportation User: At approximately this time +/- 10 minutes the unit (a high end bike computer w/ normal GPS accuracy of 9 feet) reported a -64% grade rather than the real of -1 to -3%. It also reported loss of GPS lock. It was actively searching for a lock which it had lost. Its estimated accuracy at the time was approximately 274 feet. The problem continued across a power boot of the unit. The problem resolved within about 5-10 minutes, achieving a lock with 9 foot accuracy.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance.		 User Equipment 05/08/2019
147 10/15/2018 Jeddah Port, Saudi Arabia Marine User: We lost the GPS Signal on all nodes while we are approaching the Jeddah Port today 15/10/2018, 0530z. Checked with the out bound vessels and they too does not have GPS Signals. Believed it has been jammed. Had confirmed with the departure ship [vessel] that they too have the same problem, but they received the GPS Signal once they are about 8 miles from the Port. Had checked with incoming ship [vessel] that they too lost the signals once reached the approaching area. Based on these two facts, conclusion is that it is localised to this port area only. When our Vessel is cleared of Jeddah Port and 7 miles away, GPS signal is back on all GPS receivers, GMDSS, SSAS,FBB etc,. Same as other ships have shared the information earlier. Best regards, Captain. Thank you.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space weather was reviewed and found likely to have impacted GPS performance. No correlating reports from other users or interagency partners.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal.

User encouraged to report the issue to the Communications and Information Technology Commission of the Kingdom of Saudi Arabia.		 Unknown Interference 05/08/2019
149 10/13/2018 Jeddah Port, Saudi Arabia Marine User: Before Departure from port of Jeddah Saudi Arabia in Red Sea both GPS were found out of order. There seemed to be GPS signal interference resulting in loss of signal, missing COG / SOG and absence of GPS signals affecting bridge navigation and other communication equipment. GPS screen showing no available satellites in the vicinity, no Lat/Long could be obtained. GPSs restarted - no effect. Pilot advised that tugs reported absence of GPS signal as well. After vessel was cast off situation remained unchanged so own position was obtained by visual and radar observations and frequently plotted in ECDIS as manual fix position. ECDIS was turned to Dead Reckoning mode. Approximately 10 nm away from port area both GPS recovered the signal. After calling few nearby vessels by VHF found out that GPS signal loss problem was common in this area. Also experienced that on private smartphones (verified by Master and 2/Off) it was impossible to obtain GPS position, the signal was not available.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space weather was reviewed and found likely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to report the issue to the Communications and Information Technology Commission of the Kingdom of Saudi Arabia.		 Unknown Interference 05/08/2019
145 10/08/2018 Rochester, NY Timing User: Two large phase events occurred between 0430 and 0445 UTC on October 8th.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.		 User Equipment 05/07/2019
146 10/08/2018 Huddersfield, UK Communications User: Loss of GPS lock for approx. 4 minutes during visibility of PRN27. Issue ongoing. Receivers manually forced to holdover mode until advised otherwise. Request further details of actual issue affecting PRN27 for fault reporting purposes please.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. 		User Equipment 05/08/2019
143 10/01/2018 Port Said, Egypt Marine User: Report received by email from the [vessel]. "While making the approach to Port Said, at 0030 thru 0215 and 0220 thru 0400 on 30 October we lost all GPS signal, with no fix during this time line. While at Port Said anchorage 31-22.8N, 032-20.1E), we lost GPS due to interference from 1930 thru 2040 on 30 October 2018. We had no impact to navigation while at anchor. Departure from anchorage and Suez Canal transit had no issues with GPS.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage.

See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
142 09/27/2018 Plymouth, UK Marine User: The intermittent fault happened several times while going East across Bigbury Bay -where I have had block problems before - the system started again near Thurlestone and continued to work back to Plymouth except that the interval report along the route were not applied for about an hour. Past route can be seen on Marine Traffic - boat name [removed]

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners.

Recommend user contact the UK Office of Communications. Report forwarded to the UK Centre for the Protection of National Infrastructure. 		Unknown Interference 05/07/2019
141 09/11/2018 Kabul Communications User: On 11th Sept Approx, Kabul Meteorological Department reported they were unable to track weather balloons. KABUL ATC GPS clock and navigation systems and other users were unable to gain GPS lock. Incoming aircraft report losing GPS at approx 6 miles from the airport on approach, but regain on departure. Used a spectrum analyzer and detected no apparent interference, jamming, or particular transmission from any direction from middle of the airport between runway and taxiway.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners.

Recommend user contact the Afghanistan Telecom Regulatory Authority for Assistance. 		Unknown Interference 05/07/2019
139 09/07/2018 Bratislava, Slovakia Automobile User: Two different GPS tracking modules placed outside window cannot find GPS signal.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners.		 Unknown Interference 05/07/2019
138 09/06/2018 Gulf of Mexico Marine User: Multiple vessels in our area experienced degradation of GPS signal resulting in elevated PDOP. GLONASS systems were unaffected.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, they informed us that due to the current GPS constellation there is abnormally high DOP in the Gulf of Mexico. It is only for a short time.

Additionally, there was an authorized GPS test in the vicinity at the date of the report. NOAA reported impacts to their equipment in the area. No other correlating reports from other users or interagency partner. 		GPS Testing 05/07/2019
140 08/29/2018 Tehran, Iran Communications User: Hi I find out that in all of the tehran we have td-lte GPS clock synchronization problem That most of the this type of internet service can not access to internet And also cant use [mapping application] and other GPS based application So please tell us Is this another sanction or not?!? Regards

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners.		 User Equipment 05/07/2019
137 08/20/2018 San Bernardino, CA Transportation User: GPS diagnostic screen on [equipment] showing two Satellites with no lock. With an accuracy of greater than 1200 ft. [equipment] showing 0 of 10 satellites tracked with no lock. [equipment] showing zero us satellites but showing 8 GLONASS satellites with lock. Strength average about 28 per GPS data app. Has been occurring across 2 days started in Barstow California satellite loss on GPS navigation unit has been occurring off and on across the 21st and across an area from City of Industry to San Bernardino California. GPS randomly receive signal from satellites number 10, 15, 16, 20, 21, 26, 27, and 29. Lock varies from Full to non-existent. Same as occurring on mobile phone and [equipment] Eld. Power cycle of all devices and downloading a GPS data for cell phone did not correct.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. 		Unknown Interference 05/07/2019
194 08/15/2018 Plovdiv, Bulgaria Transportation User: From August last year the clock in almost all [vehicle type] with original navigation are showing wrong date, the year is 1999 the daylight saving time is incorrect due to months mismatch, but the time is correct just 1 hour backward, it now shows November 1999 or something. This problem is massive a lot of people are complaining. Please tell me what happened from August last year so old receivers decode date and year wrong, but newer are alright.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. Suspect GPS Week Number Rollover issue.

As the GPS Week Number Rollover may have been a factor, user encouraged to contact their equipment manufacturer for assistance. User acknowledged the issue is likely related to the GPS Week Number Rollover and their older navigation system.		 User Equipment 05/08/2019
135 08/11/2018 50 miles from Qingdao, China Marine User: Military/navy exercises being conducted south of our position. Disruption at intervals for the last 50 mins. Receiver use: Input to nav equipment, communications. Vessel at anchor.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners.		 Unknown Interference 05/07/2019
136 08/10/2018 Scottsdale, AZ Other User: Testing mixed mode tracking Y-code and M-code, up to the time specified, tracking L1 and L2 M-code for PRN 26. Receiver lost lock on the L1 channel, L2 continued to track. Could track C/A, but not L1 for PRN 26 for the duration the SV remained in view. Observed other SVs with similar behavior at different times over a 3 day test period. Trying to understand why we lose lock on L1 but not L2.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. 		User Equipment 05/07/2019
134 08/03/2018 Avon, IN Other User: My son wears a GPS watch due to the possibility of him wandering from school. Around 11:30 today, I received a “check in” notification that he was in Upland, IN. I called the school in Avon, IN (hours from Upland) and they confirmed he was in class.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.		 User Equipment 05/07/2019
144 08/01/2018 Lakewood, WA Transportation User: For many months now, GPS goes off track when directly north of McChord Field on I-5.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.		 User Equipment 05/07/2019
133 07/23/2018 Port Said, Egypt Marine User: The [vessel] was moored in Port Said Egypt when the captain informed me that he lost the primary and secondary GPS. Disruption was intermittent. GPS also showed the ships location of west of Alexandria on at least one occasion. Ships contact information: [removed]. Please feel free to contact me or the ship directly if you have any questions.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
131 07/04/2018 Port Said, Egypt Marine Vessel was at anchor in Port Said, Egypt awaiting a canal transit on the GPS units started alarming with NO GPS FIX alarms. We verified our position using our anchor range and bearings & manually fixing position on ECDIS. Other vessels in area are reporting GPS problems as well.

See U.S. Maritime Alerts 2018-004A and 2018-004B for further information on this interference. 		Unknown Interference 11/14/2018
132 07/04/2018 Port Said, Egypt Marine User: Vessel at anchor in Port Said, Egypt. GPS units started alarming with NO GPS FIX alarms. Position verified using anchor range and bearings & manually fixing position on ECDIS. Other vessels in area are reporting GPS problems as well. GPS interference continued intermittently throughout the entire day.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
127 06/28/2018 Ankara, Turkey Other User: I am developing a product based on [equipment], which uses [chipset]. I was not getting a valid fix since the morning (now is 16:00 local time). I have tried to get a fix with my cell and couldnt get a valid fix for a long time. The phone has seen just one satellite and it had a very weak SNR.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. 		User Equipment 05/07/2019
128 06/28/2018 Rockport, Texas User: The problem are the directions given to truckers, etc, when attempting to visit our facility. Directions send the vehicles to the south side of the ship channel. Our facility is on the north side of the ship channel.

NAVCEN: User provided information on how to contact mapping software providers to update their location details. 		Mapping Issue 05/08/2019
125 06/16/2018 Vila do Conde, Brazil Marine User: Every day in the morning time up to lunch time the GPS gives warnings about unsafe position.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. 		Unknown Interference 05/07/2019
124 06/15/2018 Nashville, TN Other User: Mapping applications on three devices gave the wrong directions three times. None of the maps were anywhere correct. Was there a disruption or outage? Might not be anything but it was very odd. Also, the application seemed to be speaking jabberwocky at times during the ordeal of us being lost.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partner. 		User Equipment 05/07/2019
126 06/15/2018 Powell, OH Transportation User: I pulled up GPS on my [mobile phone] to get a route. I used [mapping application] first and it said that no GPS was available at that time. I then tried [mapping application] and it was down too. I closed down both apps and tried shutting down my phone and still, nothing worked. I ended up finding turn by turn directions that did not use GPS. I used those but got into a car accident because as a new driver, I rely on GPS. When law enforcement (EMS and police) arrived on the scene, I told them that GPS was down. They said that their systems were down too. Were there any planned outages in our area around that time? If so, I wish that I had been warned somehow and saved from that dangerous situation. Many people rely on GPS in order to safely navigate, and an outage can cause accidents and even deaths.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. 		User Equipment 05/07/2019
120 05/29/2018 Le Port Reunion Island Surveying User: GPS elevation inaccuracy greater than 10 cm between 1400 and 1430 and then from 1800 local time (UT+4). It is affecting about 10 or more receivers on site (all machines, survey boat, land GPS backpack, excavators) we are working with RTK mobile receiver link to a base station by radio ling. There are three RTK base station on site with dedicated radio link. We saw on the sky GPS predictions. That GPS N29, is in view between about 1700 and 1430 then coming back again from about 1800 (5 degree elevation mask). We will try to disable GPS N29 from our equipment. No further information provided.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. 		User Equipment 05/07/2019
119 05/27/2018 Bend, Oregon Automobile User: Getting a NO GPS symbol on our unit, tried resetting and powering on and off, no swings have changed since last use.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. 		User Equipment 05/08/2019
123 05/26/2018 Yellowknife, Canada  Other User: PRN18 failed to be measured near the period of an unusable (UNUNOREF) NANU covering part of the reported period. NANU 2018028-GPS SATELLITE SVN34(PRN18)WAS UNUSABLE ON JDAY 146 (26 MAY 2018) BEGINNING 0948 ZULU UNTIL JDAY 146 (26 MAY 2018) ENDING 0950 ZULU. IGS observations covered 0940-0948.

NAVCEN: Report forwarded to GPSOC. Issue was covered by the release of NANU 2018028. 		None 05/07/2019
117 05/18/2018 35 NM North of Egyptian coast Marine User: GPS total signal loss on 3 occasions: 17MAY18 2354Z - 18MAY18 0031Z 18MAY18 0240Z - 0248Z 0340Z - 0341Z -[equipment] models track Cypress standard GPS with Differential beacon 320 - [equipment] models track a Differential spot beam service by paid subscription. Last noted GPS interruption was on 30 APR

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
118 05/18/2018 100NM off Port Said Marine User: For the past hour GPS signal is either lost or incorrect in approximately 5 minute increments. Vessels in the area are reporting the same.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority. 		Unknown Interference 05/07/2019
115 05/10/2018 Port Said, Egypt Marine User: [Vessel] Tracking 85 East. Vessel is located in port, position keeps changing even though vessel is not moving. position is wrong in about 2-2.5hr increments; incorrect positions are not consistent.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
121 05/10/2018 Fairbanks, Alaska Other User: Since 10 May, several balloon flights have been terminated due to possible GPS interference issues. Analysis points to a possible disturbance source of narrow beam transmission from the airport or in its vicinity.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There was an authorized GPS tests in the vicinity at the date and time of the report. No correlating reports from other users or interagency partner. 		GPS Testing 05/08/2019
114 05/09/2018 Armenia, Quindio, Columbia Other User: All my phones, my friends phones, and tablets are currently experiencing this outage in Armenis, Quindio, Colombia.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. 		Unknown Interference 05/07/2019
122 05/01/2018 Doylestown, Pennsylvania  Communications User: Indicated location was erratic and device was unable to obtain accurate GPS location even after device was reset after traveling 5 miles. Device works normally in other locations throughout the U.S.

NAVCEN: User provided information on how to contact mapping software providers to update their location details. 		Mapping Issue 05/07/2019
113 04/30/2018 Orlando, Florida Aviation User: [Our company] is a producer of high accuracy, aviation time, space, and position information (TSPI) equipment, primarily for defense. We develop, produce, and maintain TSPI equipment at the coordinates above. We have been experiencing nearly continuous interference over the past two days. The interfering transmitter is operating in the range approximately 1566-1576 MHz. The signal is a modulated signal and appears to be an out of band transmitter as opposed to a jammer. We have captured the spectra at several times. The interfering system is blanking our (and presumably other) receivers. We are well versed in GNSS systems and technology. The equipment being blanked is used in military flight test operations. The ongoing interference is impacting our ability to conduct operations. Please do not hesitate to contact me should you have any questions or need any additional information.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partner. Report forwarded to FCC for action. 		Unknown Interference 05/07/2019
112 04/23/2018 Colorado Springs, CO User: Going north on I-25 around Colorado Springs, CO., GPS insisted that I get off of I-25 at each exit instead of waiting for correct exit. It occurred entering and departing Colorado Springs, CO. area.

NAVCEN: User provided information on how to contact mapping software providers to update their location details.		 Mapping Issue 05/07/2019
109 04/18/2018 EASTERN MEDITERRANEAN SEA Marine User: DISRUPTIONS EVERY FEW MINUTES, CONTINUING AT TIME OF NOTIFICATION. ALL VESSELS IN THE AREA ARE COMPLAINING ABOUT THIS ISSUE. NO GPS POSITION FROM MORE THAN 3HRS. SATELLITES ARE TRACKED AND DECLARED HEALTHY IN GPS RECEIVER BUT NO POSITION AVAILABLE. PLEASE ASSIST ACCORDINGLY.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
110 04/17/2018 Romania and Vietnam Marine User: We have received reports from a shipyard in Romania and Vietnam having lost of GPS at a specific time of the day. In Romania, happens every day at 11:00 AM during about 5 minutes and in Vietnam happens at 3:00 AM or 1:30 PM depending of the position of the vessel. We would like to confirm that there are no known test/trials happening in this area at that specific time.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. Recommended contacting the National Authority for Management and Regulation in Communications. 		Unknown Interference 05/07/2019
108 04/16/2018 Port Said, Egypt, N entrance of Suez Canal Marine User: Intermittent and very frequent loss of GPS signal (time and position) while vessel was approaching Port Said). Same was reported by many vessels in vicinity by VHF radio.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
156 03/29/2018 York, PA Other User: My cell phone GPS does not function properly. I have gotten a new phone from the manufacturer which did not solve the problem. I have been speaking with my service provider and they are informing me that it is not a service issue but rather "my signal is being sent to the wrong satellite" and that they were unable to help me. They provided me with this link to file a report. I have used several different GPS apps, none of which work properly. Even when I am stationary these applications have difficulty finding my exact location and instead cast a large circle around my relative location. This has been going on for several months. It seems to be worse in more densely populated areas though it does not function well anywhere. Any assistance would be greatly appreciated.

NAVCEN: There are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact equipment manufacturer or application developer for further assistance. Most likely caused by incorrect equipment or application settings. 		User Equipment 05/08/2019
104 03/22/2018 DAMIETTA PORT, Egypt User: GPS EXPERIENCES LOSS OF SIGNAL PROBLEM FROM LAST 5 DAYS. MOST OF THE TIME IT HAPPENS NEAR EGYPT, LEBANON AND IN EASTERN MEDITERRANEAN REGION.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
102 03/21/2018 Suez Marine User: Vessel is West bound from Port Said to Gibraltar. Position stated is current one, problem with GPS position started in Port Suez on 21 March. This is ocean going ship with 3 GPS units (all same model) with no prior problems. Overheard on VHF other vessels experiencing GPS position issues. Can you confirm if the area is affected by malfunction, testing or other disruptions of GPS system? I suspected hardware problem, but it happens on ALL units and position is on and off. Thank you.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
103 03/21/2018 AT SEA, POST DEP PORT SAID, Egypt Marine User: Master deemed it necessary to send it as non-routine under "any other potential, including potential problems" as the matter concerns vessels primary navigational system. Note that vessel had experienced problems with both GPS units of "no signal, alarm 001" since the night of 21st mar 2018. The problem of "no signal, alarm 001" was experienced on both GPSs just after departing from Suez Canal, Port Said side, on 21st Mar 2018. The problem was very frequently experienced in 3/O & 2/O watches. Then intermittently in C/Os watch going into the morning 22nd Mar 2018. Pls note that we had called at least 4 ships in our vicinity and they all confirmed the same problem with their GPSs, though with varying frequencies. This of-course has had an effect on the ECDIS. When the signals were lost, the courses went haywire. ARPAs was also effected, positions were not showing up.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
100 03/19/2018 Cyprus Marine User: Sir/Madam, [we] have received information from multiple sources indicating a problem in receiving GPS signals on their equipment or having an accuracy problem., while sailing in the eastern Mediterranean. Could you please provide any information regarding this problem so the [we] can promulgate relative messages in case necessary? Best regards,

See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
98 03/18/2018 Port Said, Egypt Marine User: We have 4 DGPS and 3 GPS receivers on board. All of them affected. GPS were lost and DGPSs are being affected with not stable position or lost. Disturbance still continuous.

NAVCEN: See U.S. Maritime Advisory concerning GPS Interference on the MSCI Portal. User encouraged to report the issue to the nearest communication authority.		 Unknown Interference 05/07/2019
96 03/07/2018 San Francisco, California Automobile User: Since 5am 7th March we noticed that the L1 frequency has been marked unhealthy in the CNAV ephemeris message. This is still continuing at 5pm on the same day. All L2 CNAV ephemeris message indicate that the L1 is unhealthy. Additionally L5 is marked unhealthy however this was the case before 5am today as well.

NAVCEN: The L2C and L5 signals are considered pre-operational. A pre-operational signal means the availability and other characteristics of the broadcast signal may not comply with all requirements of the relevant interface specifications and should be employed at the users own risk. Refer to Notice Advisory to NAVSTAR Users (NANU) 2014038 and 2014039.		 User Equipment 05/07/2019
94 02/19/2018 Washington (USA), Yellowknife (Canada), Brest (France) Other User: On the 19th of February 2018, some IODE/IODC of the ephemeris/clock information transmitted by PRN#06 from 04:42:30 to 06:44:30 were the same (14,15) as the data used on the same day for that PRN from 03:53:00 to 04:42:30 while the navigation data were different in violation of the GPS ICD 200 IODE repetition rule (unicity over 6 hours) and of the GPS ICD 200 IODC repetition rule (unicity over 7 days).

NAVCEN: Forwarded the report to the GPS Operations Center: The cause of the IODC repetition error was the result of an issue experienced with the ground control system. The problem has been corrected.		 ICD_Violation 05/07/2019
93 02/16/2018 West Palm, Florida Marine User provided no details related to their issue of their issue.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. 		User Equipment 05/07/2019
92 01/31/2018 Bad Pyrmont, Germany Timing User: This morning I was contacted by my [colleagues] who both have observed an anomaly in the timing characteristics of the GPS signal. [Colleague]s GPS receiver did an internal measurement against a Rubidium unit coupled with a very long time constant showed a time drift of -45ns an then back to zero whereas [colleague] is measuring the GPS offsets agains its internal HQ OCXO showed a time drift of +150ns and then back to zero. Both have used different types of receivers, [colleague] was using a [equipment] design with our proprietary receiver technology where [colleague] used the [equipment]. Is there a known anomaly in the GPS signal on Jan 31th between 7.00 and 8.00 UTC ? We have checked the number of received satellites and have found no outage. Best regards,

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. 		Unknown Interference 05/07/2019
165 01/15/2018 Austin, TX Automobile User: In post-processing of the L2C CNAV message, it was observed that ephemeris records for several SVs were in error. Specifically, Longitude of the Ascending Node and/or Mean Anomaly differed by 1 semi-circle (PI radians) as compared to LNAV ephemeris, on some SVs. We understand L2C is pre-operational; informing in the unlikely case this error had yet to be diagnosed.

Follow-up from user: Please disregard a problem report submitted earlier suggesting an issue w/ GPS L2C ephemeris at the period specified. Suspected issue was found to be with the receiver.

Closed as user equipment issue. 		User Equipment 05/07/2019
91 01/08/2018 Hinkley,California Automobile User: Heading East on highway 58, near Hinkley, CA, the GPS in the navigation suddenly announced "off route and recalculating", when the map restored, it showed the vehicle to the north of highway 58. Over 5 miles it slowly moved back until it showed us back on the highway. we checked both our cell phones and they showed the same error. On our return trip on Jan. 16, the same error occurred going west on highway 58 also just west of Hinkley.

NAVCEN: No correlating reports from other users or interagency partners. User provided information on how to contact mapping software providers to update their location details.		 Mapping Issue 05/07/2019
99 01/01/2018 Southern Tasmania Marine User: Numerous high HDOP errors frequently occurring over previous 3 months. Our unit is set to alarm at HDOP>2.0, and the alarm has been sounding numerous times each day. Vessel operating in southern Tasmania region, within a 200 mile radius of the position given above. Occasional very high spike into HDOP>30, and 2 occurrences >100, with subsequent position shift of around 200 metres noticed on ECDIS. Backup GPS receiver also shows occasional high DOP error (not split into HDOP and VDOP), but not as high as main unit. Is this likely to be a receiver fault?

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. 		User Equipment 05/07/2019
268 01/01/2018 Breckenridge, CO Automobile USER: I was hoping to find out what GPS satellite was assigned to my vehicle for GPS. Has it been decommissioned or not updated? I cannot get any satisfaction from dealer. Confusing because I still have compass function and time, but date will always correspond to day and date in 2015. Seems it has not been updated since then and I am frustrated by that.

NAVCEN: There is no activity in the GPS constellation of satellites that could be causing the problem indicated. GPS equipment is not assigned a specific satellite. Rather the equipment will track all satellites in view, usually 8-12 of them depending on location. However, given this type of date time problem and the subsequent failure of your equipment, there is a high probability that your equipment was affected by the 2019 GPS rollover event. If your equipment is showing a date other than todays date, this is a problem with how your equipment is handling the updated GPS week number value. We recommend you ensure your equipment software is up to date, refer to your equipment manual, update your application, or contact your application developer or equipment manufacturer for assistance. We recommend all users share these reports with their application developer or equipment manufacturer. This real world feedback can help developers and manufacturers improve their products.

Update: Manufacturer has stated the user must replace the equipment. 		User Equipment 12/20/2019
87 12/12/2017 West Chester, PA Transportation User: Unable to acquire satellites even after restarting unit.

NAVCEN: User encouraged to contact their equipment manufacturer for further assistance. User later reported a software update corrected the issue. 		User Equipment 05/20/2019
88 12/02/2017 New York City, New York Timing User: We have two receivers using separate antennas located on the west side of the building. The loss of timing happens ~4 minutes earlier every day. Problem started on 2 Dec at 1402 Eastern and last interruption was 30 Dec 1210 Eastern. Only recently started to log sats but it seems to happen when sat 12 is starting to be used by the receiver. This setup has been in use for >5 years with out coverage issue so I dont think that is the problem. We stay locked with 3 sats in view and this problem occurs with more than 3 sats. Confirmed there is no in band RF interference. We would appreciate any information since we are at a loss as what to do to remedy or mitigate this issue.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners. User informed the issue is most likely related to the location of the equipment and equipment settings. 		User Equipment 05/20/2019
85 11/30/2017 Global Other User: GPS PRN22 orbit error started to wander off. Problem seen globally, but worst on USA East Coast and East Australia. We would like to understand the reason for the anomaly.

NAVCEN: The GPS Operations Center reported PRN 22 was healthy and performing nominally. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance. 		User Equipment 05/20/2019
84 11/19/2017 Concord, CA Other User: Mobile phone GPS application unable to locate user. Device reset corrected the problem. User Equipment 05/20/2019
82 11/07/2017 Worth, NY Communications User: Mobile phone has not been able to connect to GPS all day.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
107 11/06/2017 Kume Island, Japan Marine User: At 13:35:07, the GPS time output jumped to 13:37:16. It remained constant with this time offset for 10.5 hours. At 00:03:37, it jumped backwards from the offset time to the correct time. It maintained this time afterwards. This is a mature installation. Clear sky view. Other GPS receivers in operation did not experience problems. Were there any constellation issues at that time? If not, can you postulate a fault mechanism that could cause a constant time offset like this? Note: Question 6 did not allow "2017" as the year the disruption stopped.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. No correlating reports from other users or interagency partners. 		User Equipment 04/15/2019
81 11/04/2017 Anchorage, AK Other User: Regularly use GPS on mobile devices to set and monitor trails in the area. No app could find a signal so used GPSDiagnostic to determine what satellites were accessible. The app indicated that it could identify NO satellites.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 Unknown Interference 05/20/2019
80 10/28/2017 Jordan Lake, NC User: First indication of disruption were intermittent wrong time of day displays (roughly 3 hour advanced). GPS location tracking was also interrupted intermittently while sailing within 2 miles of specified location.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
79 10/26/2017 Alexandria, VA Transportation User: Mobile device GPS applications could not load the GPS, error stated GPS unavailable.

NAVCEN: User encouraged to contact their map provider or mapping application developer. 		Mapping Issue 05/20/2019
78 10/24/2017 Sea of Japan Marine User: Both GPS systems onboard have been inoperable. GMDSS system is working correctly. App on phone using wifi is also working correctly.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 Unknown Interference 05/20/2019
77 10/18/2017 Addison, TX Aviation User: Several pilots have reported a problem with a GPS outage in the vicinity of the airport. The problem is happening while landing and departing both runways, and all pilots have stated that their RNAV instruments malfunction when close to the airport.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

Authorized GPS testing was scheduled near the reported location and may have impacted GPS performance.		 GPS Testing 05/20/2019
76 10/12/2017 Scranton, PA Automobile User: I was traveling from Vermont to Winchester Virginia when, at some point, the gps advised to turn west on an interstate to Scranton PA. I got completely lost. All I would like to know is if there were any ongoing issues in that area yesterday.

NAVCEN: User encouraged to contact their map provider or mapping application developer. 		Mapping Issue 05/20/2019
75 10/10/2017 Macon, GA Other User: GPS unit could not fix any satellites until around 1300 on 10/10/2017. To be able to receive notifications of GPS constellation problems, where do I and or others sign up.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.

Provided information on how to subscribe to GPS information products through NAVCEN website. Directed user to the approved GPS testing page on NAVCEN website. 		User Equipment 05/20/2019
74 10/01/2017 Ringwood, NJ Transportation User: The GPS was anchored at the last site that was used as a detour for traffic Road work. I attempted to restart the unit at different locations with no success.

NAVCEN: User encouraged to contact their map provider or mapping application developer. 		Mapping Issue 05/20/2019
70 09/25/2017 Hsinchu, China User: Dear Sir, Recently the 2 MSBs of IODC has been set to non-zero value, which is different from the zero value that has been in use for more than 10 years before. Although our engineers tried to be very careful in preparation of ROM code release for GPS chipset implementation, checking various test scenarios using GPS simulator, we still missed an issue in applying the 2 MSBs of IODC. This and recent change of those 2 MSBs becoming non-zero value caused about 2 million units of GPS receivers worldwide that worked perfectly for many years now suddenly have potential problem of unable to get position fix, we are beginning to get many customer problem reports coming in this week. May I ask if this IODC parameter will be set to a number < 256 again? And could the two MSBs of IODC be set to zero again as soon as possible please? Thank you very much.

NAVCEN: We have contacted the GPS Operations Center and they have informed us that: “After a recent ground system software update, we received reports of some users experiencing negative issues. As a result, we re-verified that our software update was indeed in complete compliance with IS-GPS-200 standards. Nonetheless, in order to continue to support all of our users to the maximum extent possible, we rolled back the software update to a previous version so that we can take the time to consult with the affected receiver manufacturer and proceed forward in a way to ensure dependable access to GPS for all users. In this case, as always, Air Force officials continue to work with their counterparts in the U.S. Coast Guard to analyze and respond to all user concerns.”

Encouraged user to supply additional information on impacts to user equipment and mitigations employed to deal with this change. Input shared with the U.S. Air Force.

User equipment does not meet IS-GPS-200 requirements. You can find the Interface Specification (IS-GPS-200) in the technical documentation section of GPS.gov under Interface Specifications (GPS.gov). 		User Equipment 05/20/2019
72 09/25/2017 Perugia, Italy Timing User: Civil Defense and Environemental Monitor application We have about 300 units which will stop to work if a cold start will happen. The unit cannot get basic information for first fix. They are installed worldwide in remote stations. Manufacturer of [manufacturer] reported the signal from GPS is no longer compatibile with these units, the units cannot be updated because the firmware is not accessible. We do not know the exact date of signal change, approximately the problem started in a time window between Mid August 2016 and 25 September 2016. Although this problem is generating costs to our company in terms or workaround and replacement of parts, there are many instrument that cannot be accessed easily and this will cause a interruption of services for the public interest. Thank you for your attention and cooperation.

NAVCEN Response: We have contacted the GPS Operations Center and they have informed us that: “After a recent ground system software update, we received reports of some users experiencing negative issues. As a result, we re-verified that our software update was indeed in complete compliance with IS-GPS-200 standards. Nonetheless, in order to continue to support all of our users to the maximum extent possible, we rolled back the software update to a previous version so that we can take the time to consult with the affected receiver manufacturer and proceed forward in a way to ensure dependable access to GPS for all users. In this case, as always, Air Force officials continue to work with their counterparts in the U.S. Coast Guard to analyze and respond to all user concerns.”

User equipment does not meet IS-GPS-200 requirements. You can find the Interface Specification (IS-GPS-200), dated July 2017, in the technical documentation section of GPS.gov under Interface Specifications (http://www.gps.gov/technical/). 		User Equipment 05/20/2019
73 09/23/2017 Djelfa Province, Algeria Transportation User: Hello, On 23.09 we detected a problem with the GPS signal in North Africa and Eastern Europe creating GPS initialization problems and time fix for our GPS tracking devices. Practically they have stopped working on large areas that was covered by over 5000 GPS tracking units. Today the situation in Eastern Europe is going back to normal but persist in North Africa. Please let us know the cause of the signal problems and how long will take for the signal to return to normal. Thank you

NAVCEN response: We have contacted the GPS Operations Center and they have informed us that: “After a recent ground system software update, we received reports of some users experiencing negative issues. As a result, we re-verified that our software update was indeed in complete compliance with IS-GPS-200 standards. Nonetheless, in order to continue to support all of our users to the maximum extent possible, we rolled back the software update to a previous version so that we can take the time to consult with the affected receiver manufacturer and proceed forward in a way to ensure dependable access to GPS for all users. In this case, as always, Air Force officials continue to work with their counterparts in the U.S. Coast Guard to analyze and respond to all user concerns.”

User equipment does not meet IS-GPS-200 requirements. You can find the Interface Specification (IS-GPS-200), dated July 2017, in the technical documentation section of GPS.gov under Interface Specifications (http://www.gps.gov/technical/). 		User Equipment 05/20/2019
71 09/22/2017 Dallas, TX Research User: Starting last Friday, 22nd we noticed that the two high bits of the 10 bit IODC became non-zero. With all space vehicles as far as we can tell being non-zero by this Sunday. This is causing an ephemerides decding issue in our firmware preventing correct download of this data. Is this new behavior going to persist? If not when will it end? Is it possible to ask that the high bits cycle through 0 at least once per 6 hours for each space vehicle? Best Regards

NAVCEN: We have contacted the GPS Operations Center and they have informed us that: After a recent ground system software update, we received reports of some users experiencing negative issues. As a result, we re-verified that our software update was indeed in complete compliance with IS-GPS-200 standards. Nonetheless, in order to continue to support all of our users to the maximum extent possible, we rolled back the software update to a previous version so that we can take the time to consult with the affected receiver manufacturer and proceed forward in a way to ensure dependable access to GPS for all users. In this case, as always, Air Force officials continue to work with their counterparts in the U.S. Coast Guard to analyze and respond to all user concerns.

User equipment does not meet IS-GPS-200 requirements. You can find the Interface Specification (IS-GPS-200) in the technical documentation section of GPS.gov under Interface Specifications (GPS.gov).		 User Equipment 05/20/2019
69 09/20/2017 Worldwide Automobile User: It appears that the Subframe-2 IODC message two MSBs have changed from 0 to a non-zero value for the first time in the last 10 years in some or many GPS Sats. This is causing potentially 100s of thousands of [manufacturer] receivers to stop generating GPS fixes for some reason. When will the two MSBs of the IODC parameter be set back to zero again? Can this please be done as soon as possible so as to make these large numbers of fielded [manufacturer] receivers work again? Thanks much!

NAVCEN: We have contacted the GPS Operations Center and they have informed us that: After a recent ground system software update, we received reports of some users experiencing negative issues. As a result, we re-verified that our software update was indeed in complete compliance with IS-GPS-200 standards. Nonetheless, in order to continue to support all of our users to the maximum extent possible, we rolled back the software update to a previous version so that we can take the time to consult with the affected receiver manufacturer and proceed forward in a way to ensure dependable access to GPS for all users. In this case, as always, Air Force officials continue to work with their counterparts in the U.S. Coast Guard to analyze and respond to all user concerns.

User equipment does not meet IS-GPS-200 requirements. You can find the Interface Specification (IS-GPS-200) in the technical documentation section of GPS.gov under Interface Specifications (GPS.gov).		 User Equipment 05/20/2019
68 09/19/2017 Tacoma, WA Marine User: GPS related equipment was interfered with when a bus was near the Ferry Terminal serviced. [Ferry operator] investigated and trouble shot the incident and found that Bus was indeed the cause of the disturbance and [bus operator] agreed to take the bus out of service until the problem could be identified.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User determined the cause of the interference was a transit bus operating near the location. Coordination between the ferry operator and the bus operator determined the cause was unintentional interference caused by improper equipment installation onboard the transit bus. The installation was corrected and the issue resolved. 		Unintentional Interference 05/20/2019
66 09/03/2017 Rotterdam, Netherlands, to Antwerp, Belguim Automobile User: While dringin, and despite several restarts of the system my build in vehicle GPS was systematically for about 30 min showing wrong location about half a mile to the east from correct position. At the same time a separate mobile phone navigation was showing correct position. This has not hapened previously.

NAVCEN: User encouraged to contact their map provider or mapping application developer. 		Mapping Issue 05/20/2019
65 09/02/2017 Concord, MA User: I am near a highway; perhaps someone is using a GPS disruption box to avoid tolls. It happened again last night at around 10:27 EDT.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer, map provider or mapping application developer. 		User Equipment 05/20/2019
64 08/30/2017 Indiana to Illinois Transportation User: [equipment] as well as [equipment] GPS have not worked for more than 24 hrs. [equipment] GPS is displaying a red circle with line through it indicating no GPS service. [equipment] is continually down and states "all entries must be manual". Please help!

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
62 08/22/2017 Myrtle Beach, SC Automobile User: Mobile phone GPS application was not loading.

NAVCEN: User encouraged to contact their map provider or mapping application developer. 		Mapping Issue 05/20/2019
60 08/11/2017 South Korea Timing User: one of our customers claim that their GPS swap time at UTC 2200 to UTC 2400 and have done so multiple of times. This unit is placed close to the north boarder. Technical engineers are now traveling to the unit so that we can get more details on what is wrong with the installation. The second case is about the Olympic games which will be in Soul next year, summer. I have been asked if I can keep the sync for the broadcast system even if GPS is gone. The new IP based Digital TV system need GPS or IEEE 1588 to work well so we need a stable sync to get the digital information forward. So my question to you is: Do you know if the US has an alarm system in this area for GPS disturbance? Who can we contact and ask for alarms? Please support us! [Submitted by NAVCEN personnel from e-mail correspondence from reporting source.]

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact the Korea Communications Commission to assist with identifying radio frequency interference.		 Unknown Interference 05/20/2019
57 08/08/2017 San Clemente Island, CA Marine User: For the last two weeks in our area of operations, we have been experiencing loss of signal on all 3 of GPS units. Our typical routes seem to be losing our position constantly. The last two days have been worse than usual. At times, we go from 3D to 2D and then to no fix at all. Please let me know if there is anything we can do to, or when we can expect to no longer receive these alarms.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

Authorized GPS testing was scheduled near the reported location and may have impacted GPS performance. 		GPS Testing 05/20/2019
59 08/01/2017 Helsinki, Finland Other User: GPS lack about every 10-20 sec and not give any information after 3 sec, it cycle that. I think that USA do that on purpose beacose Russian and China warships are Baltic sea near the Finland to practiced together! Not nice at all!

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.		 Unknown Interference 05/20/2019
49 07/29/2017 York, PA, and Washington County, MD Other User: Call centers in York, PA and Washington County, MD experiencing GPS timing issues on their [equipment]. This report was taken over the phone by the USCG Navigation Center.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

Equipment is known to have a GPS Week Number Rollover issue that occurred in 2017. A firmware update was issued in 2017. It appears the user did not apply the firmware update. User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
50 07/29/2017 Charleston, SC Timing User provided no description beyond equipment type.

The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
48 07/23/2017 Port Hedland, Australia Transportation User: Each Locomotive has two GPS rims fitted, on odd and one even and the odd GPS stopped working today here in Australia and also we have reports that the units in China also stopped working. These units provide location services for a Railway control system called ITCS and this has caused a total site outage and rendered the system inoperable due to the Kalman filter causing error and the safety system failing.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User reported a firmware update corrected the issue. 		User Equipment 05/20/2019
47 07/22/2017 Walnut, IA Transportation User: Map screen just says no GPS signal from western Iowa all the way across Nebraska.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
46 07/12/2017 Elizabeth, NJ Automobile User: OUR PROBLEM IS MOSTLY ALL OUR CLIENTS, COMPLAINT ABOUT HAVING THE WRONG ADDRESS IN GPS. GPS GIVE THEM [address] ELIZABETH NJ 07208 INSTEAD OF [address] ELIZABETH NJ 07208

NAVCEN: User encouraged to contact their map provider or mapping application developer.		 Mapping Issue 05/20/2019
45 07/10/2017 Tulsa, OK Timing User: Our receivers indicated a spike in phase error shortly after PRN 2 became visible. The phase error seemed to resolve itself when full signal strength was reached.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
44 06/24/2017 Charlotte, NC Aviation User: GPS reception was intermittent all day, when receiving a signal location was off by over 1000 feet, this was experienced while driving and while stationary flying multiple drones and lasted most of the day and was very unusual.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
43 06/23/2017 Ashtabula, OH Communications User: All 3 of my devices have put me about 250 miles south west of where i acually am. I live in Ashtabula Ohio and they all but me at an apartment in Galloway Ohio.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance. It is possible the user was experiencing a network error, or a problem with wireless services.		 None 05/20/2019
39 06/22/2017 Black Sea, Novorossiysk, Russia Marine User: GPS equipment unable to obtain GPS signal intermittently since nearing coast of Novorossiysk, Russian. Now displays HDOP 0.8 accuracy within 100m, but given location is actually 25 nautical miles off actual location.

NAVCEN: See U.S. Maritime Alerts 2017-005A-GPS Interference-Black Sea for further information on this interference. MSCI Portal		 Unknown Interference 05/20/2019
38 06/19/2017 Austin, Houston and Dallas, TX Automobile User: [Mobile] map application - the arrow icon begins to move off the road, spin or otherwise not move at all. Eventually, a "GPS Signal was lost" message appears, second mobile map application - error message "No GPS Signal".

NAVCEN: User encouraged to contact their map provider or mapping application developer.		 Mapping Issue 05/20/2019
37 06/10/2017 Stephens City, VA Other User: Mobile phone and GPS fitness tracker both received intermittent reception while traveling through the park.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
36 06/02/2017 Wenatchee, WA Automobile User: Navigation signal strength is low or non existent.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
32 05/31/2017 Estero, FL Surveying User: We are seeing GPS drop from 5/26,5/30,5/31 at around the 10:40 eastern time for a 15 minute period, for the location. Antenna is roughly 15 feet above the ground with little multi-path.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found to be unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
31 05/28/2017 New Orleans, LA Transportation User: No GPS signal being displayed.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance. 		User Equipment 05/20/2019
33 05/24/2017 Toulouse, France, and Athens, Greece Other User: On the 24th of May 2017, some IODE/IODC of the ephemeris/clock information transmitted by PRN#10 from 18:23:30 to 23:59:59 were the same (40, 41, 42) than the ones used on the same day for that PRN from 14:00 to 18:23:59 while the navigation data were different in violation of the GPS ICD 200 IODE repetition rule (unicity over 6 hours) and of the GPS ICD 200 IODC repetition rule (unicity over 7 days).

NAVCEN: Forwarded report to the U.S. Air Force which manages the GPS constellation. They report the cause of the IODC repetition error was the result of an issue experienced with the ground control system. The problem has been corrected.		 ICD_Violation 05/20/2019
30 05/22/2017 Knoxville, TN Automobile NAVCEN: No information provided by user. No response to requests for additional information. None 05/20/2019
29 05/19/2017 Turin, Italy Research User: Since 17/05/2017 GNSS signal at frequency L1=1575.42 MHz have been affected during the local afternoon hours, by spurious continuos wave signals. The main components of the spurious signal are at an offset of 0.5 MHz on both sides of L1. Further harmonics with lower power are also present. The investigation excluded that such interfering signal could be generated by local terrestrial sources, since it has been measured at several Km from the antenna with the same power level. Having observed a 24h repetition of the phenomena, the interference might be a case of intrasystem interference generated by GPS satellite with PRN 26 which was in view at the monitoring location for the 3 days during which the interference has been observed. The signal has been observed through our software receivers and by means of spectrum analyzers.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

The report was forwarded to the European GNSS Service Center. User encouraged to report the incident to the Italian communications regulatory authority for assistance.		 Unknown Interference 05/20/2019
27 05/10/2017 Porter, TX Transportation User: My wife is a [rideshare] driver and the [navigation] applications would not establish our current position as of 11 pm on the 10 th . As far as I can tell other drivers are having the same issue . My wife and I are computer literate and gone over phone and tablet settings multiple times to ensure it is not our devices. each time we found that the GPS cant locate our position or track our position while moving.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found to be unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
28 05/06/2017 Wenatchee, WA Automobile User: For the last few weeks or so my newley installed [equipment] navigation system has shown only 0-1 bars of GPS signal. The week prior it seemed fine, but cant say exactly when it started only when I noticed. Sat 5/6/17 Went to a local town and GPS showed me over 60miles off of my current location this lasted for about an hour when all of a sudden the signal jumped to 3 bars and everything worked fine. Today 5/18 my signal strnegth again is 0-1 bars, but navigation seems to be farely accurate but jittery.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found to be unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
26 04/11/2017 Gutersloh, Germany Agriculture User: Farmers in Gugersahol, Germany are reporting that there GPS units stop functioning.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found to be unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance. User acknowledged equipment issue.		 User Equipment 05/20/2019
24 04/02/2017 Channel Islands, CA Marine User: Several systems, across all of our assets at sea, all affected

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

Authorized GPS testing was scheduled within 200 miles of the reported location and may have impacted GPS performance.		 GPS Testing 05/20/2019
23 03/29/2017 Denver, CO Automobile User did not provide details of mobile device mapping software application error.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact equipment manufacturer or application developer for further assistance. Most likely caused by incorrect equipment or application settings. 		User Equipment 05/20/2019
18 03/19/2017 El Monte, CA User: I have lived her for over 1 year and no one has been able to use GPS.

NAVCEN: User provided information on how to contact mapping software providers to update their location details. 		Mapping Issue 05/20/2019
16 03/10/2017 Condon, OR Automobile User: Travelled to Condon, Oregon on remote, unpaved roads. When I left Condon the unit directed me first south and then west.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
15 03/04/2017 Lyons, GA Transportation User: Our home is located on the west side of the highway. GPS directs drivers to turn onto the east side of [the highway] rather than to the west.

NAVCEN: User provided information on how to contact mapping software providers to update their location details. 		Mapping Issue 05/20/2019
14 03/01/2017 Clarion, PA User: Unit has 1-2 bars of signal in an area clear of trees buildings or high tension power supply. Unable to aquire location while driving through Pennsylvania.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
13 02/26/2017 Williamstown, NY Automobile User: My GPS has been down and I would like to know when it will be up again.

NAVCEN: Contacted user and determined GPS unit was providing incorrect location. Another device was operating properly at the same location. User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
34 02/14/2017 Barcelona, Spain Automobile User: [No description provided about a mobile phone problem.]

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found to be unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

The report was forwarded to the European GNSS Service Center. User encouraged to report the incident to the Spanish communications regulatory authority. 		Unknown Interference 05/20/2019
12 02/08/2017 Chandler, AZ Aviation User: There is a small corridor at the Chandler airport in Arizona that has a loss of GPS signal.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance.

Report referred to the FAA for aviation support and response.		 Unknown Interference 05/20/2019
61 02/06/2017 Oberpfaffenhofen, Germany User: The reason I am contacting you relates to the test of power increase on part of the GPS constellations as announced by the USAF in January. I am wondering whether you can shed any light on the root cause of these DCB sub-daily switches and provide some recommendations how to best deal with them in code-based single point positioning and phase-based precise point positioning?

NAVCEN: The GPS Operation Center (GPSOC) stated these configuration changes were published in NANU 2017005.		 GPS Testing 05/20/2019
9 01/26/2017 United Kingdom Timing User: This has been happening over the last 4 days we have seen a quantum leep in indications, our recivers are not the best and we are looking at replacing them but something has changed and we would like to know how we can compensate for the change as it is effecting service as we are getting time jumps

NAVCEN: 5 January 2017 the Civil GPS Service Interface Committee Executive Secretariat release the following message: Beginning 25 January 2017, Air Force Space Command (AFSPC) will conduct a limited duration test implementing an increase of the L1 C/A power level on the GPS Block IIR-M and IIF satellites (19 vehicles). The C/A power will remain within IS-GPS-200-H specifications and the power increase is not expected to increase the noise floor by more than 0.3 signal-to-noise ratio in the worst case. AFSPC reports, "We assess that there will be no adverse impacts to civil, commercial or military GPS users, but anyone who experiences issues during this test should address them through established reporting channels." Civil, non-aviation, GPS users should contact the U.S. Coast Guard Navigation Center at 703-313-5900 or online at http://www.navcen.uscg.gov/?pageName=gpsUserInput. Civil aviation GPS users should contact the FAA and file a report at https://www.faa.gov/air_traffic/nas/gps_reports/. All other nonoperational concerns or inquiries regarding this test should be directed to Air Force Space Command at a3sm.wf@us.af.mil.		 GPS Testing 05/20/2019
7 01/18/2017 Binghamton, NY Automobile User: It was reporting incorrect speed. I was going 55MPH and it was reporting 58-63 MPH. It was reporting my position off to the east by about 200-500 feet.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance.		 User Equipment 05/20/2019
6 01/14/2017  Slidell, LA User: While driving Interstate I noticed phone was reporting "seeking GPS" several times.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer or mapping application developer for further assistance.		 User Equipment 05/20/2019
8 01/05/2017 Chile Law Enforcement User: There were large spikes in geozone alarms on 3 consecutive days caused by a country-wide GPS position shift >125 feet, generally to the SouthEast. This affected 5% of the 4000+ units deployed. The times of increases in Inclusion Zone alarms are: Jan 06-2017, between 04:35:00 and 04:40:00 UTC (5 minutes, 404 alarms) Jan 07-2017, between 04:37:00 and 04:45:00 UTC (8 minutes, 337 alarms) Jan 08-2017, between 04:06:00 and 04:09:00 UTC (3 minutes, 165 alarms) All units had >4 satellites in use (actual number unknown). Maps and other data are available for the 3 GPS shift incidents.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported outage. Space Weather was reviewed and found unlikely to have impacted GPS performance. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for further assistance. 		User Equipment 05/20/2019
20 01/03/2017 San Angelo Airport Aviation User: The GPS systems in normal mode not military have been interrupted since the installation of the command and control system at the North End of our airport. During testing of the system the problem has been confirmed to affect both ground and air operations at and within 15 miles South of the airport.

NAVCEN: Report referred to FCC. FCC conducted an investigation and found no further interference events.		 Unintentional Interference 05/20/2019
1 01/02/2017 North Carolina - South Carolina border Transportation User: GPS would say when you plug in that there isnt any satellites to connect to but when you drive for about 5 miles it would pick up connection. Today when being turned on, says no satellite connection and has yet to come on. Been on for approximately 4-5 hours driven about 100 miles, still no connection.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance. 		User Equipment 05/20/2019
2 01/01/2017 Elizabeth, NJ Transportation User: My business is located in Elizabeth, NJ. At the end of the block there is a bridge that has been closed for several years, however it is not updated on any GPS. So we have a lot of 18 wheelers that come down and have to make a u-turn in front of my business. I need to know how I can update this so it will stop happening.

NAVCEN: User provided information on how to contact mapping software providers to update location details. 		Mapping Issue 05/20/2019
4 11/16/2016 Rennes, France Research User: I experimented high range error on PRN 32 (7h54 to 11h45) and on PRN 17 (20h00 12 to 23h48) the sixth of november 2016. Coul you confirm the issu please.

NAVCEN: The GPS Operations Center reviewed the GPS Constellation and Control Segment, there are no known anomalies that might affect GPS signal integrity at the time and vicinity of the reported problem. Space weather was reviewed and found unlikely to have impacted GPS performance. There were no authorized GPS tests in the area. No correlating reports from other users or interagency partners.

User encouraged to contact their equipment manufacturer for assistance.		 User Equipment 05/20/2019
Total Number of Reports: 624