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GPS Constellation Active Nanu Status NOTE: The Global Positioning Systems Directorate will propose a change to the Navstar GPS Control Segment to User Support Community Interfaces (ICD-GPS-870), Interface Control Documents that will remove Section One (1) from the GPS Operational Advisory. If that change is approved, the plane/slot, SVN/PRN, Block Type, and Clock information will no longer be available on this webpage. This would occur in conjunction with the shift from the current ground control system to the Next Generation Operational Control System (OCX). Active NANUs will continue to be available. If you use this webpage, and if you use the Operational Advisory message, or the Section 1 information contained within the message, we request that you submit a comment to us using the "Contact Us" link above to let us know how the loss of this information would impact your operations. The CGSIC will compile responses from the community and provide them to the GPS Directorate in advance of the next GPS Public Interface Control Working Group.


GPS CONSTELLATION STATUS FOR 05/25/2018

Plane Slot SVN PRN Block-Type Down ArrowClock Outage Date Nanu-Type Nanu-Subject
A 2 52 31 IIR-M RB
A 3 64 30 IIF RB
A 4 48 7 IIR-M RB
B 1 56 16 IIR RB
B 2 62 25 IIF RB
B 3 44 28 IIR RB
B 4 58 12 IIR-M RB
B 5 71 26 IIF RB
C 1 57 29 IIR-M RB
C 2 66 27 IIF RB
C 4 53 17 IIR-M RB
C 5 59 19 IIR RB
D 1 61 2 IIR RB
D 2 63 1 IIF RB
D 3 45 21 IIR RB
D 4 67 6 IIF RB
D 5 46 11 IIR RB
D 6 34 18 IIA RB
E 1 69 3 IIF RB
E 2 73 10 IIF RB
E 3 50 5 IIR-M RB
E 4 51 20 IIR RB
E 6 47 22 IIR RB
F 1 70 32 IIF RB
F 2 55 15 IIR-M RB
F 3 68 9 IIF RB
F 4 60 23 IIR RB
F 5 41 14 IIR RB 18 MAY 2018 FCSTSUMM 2018027 - SVN41 (PRN14) FORECAST OUTAGE SUMMARY JDAY 138/0817 - JDAY 138/1322
F 6 43 13 IIR RB
A 1 65 24 IIF CS
C 3 72 8 IIF CS
GENERAL INFORMATION NANUs
2014038

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014038 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***
THE PURPOSE OF THIS NOTIFICATION IS TO INFORM USERS OF AN UPCOMING EVENT RELATED TO THE GPS SATELLITE CONSTELLATION. AIR FORCE SPACE COMMAND WILL BE IMPLEMENTING CNAV MESSAGES ON THE GPS L2C AND L5 SIGNALS BEGINNING J118/1430Z WITH UPDATES FROM THE CONTROL SEGMENT APPROXIMATELY TWICE PER WEEK. THE MESSAGE POPULATED SIGNAL CONTENT WILL INCLUDE BROADCAST MESSAGE TYPES (MT) 10, 11, 12, 30, AND 33. THERE ARE NO PLANNED GPS SATELLITE OUTAGES OR DEGRADATIONS FOR THIS ACTIVITY. L2C AND L5 CNAV MESSAGES SHOULD BE TRANSPARENT TO GPS RECEIVERS THAT DO NOT PROCESS L2C OR L5 CNAV MESSAGES. THESE POPULATED SIGNALS ARE INTENDED TO FACILITATE USER FAMILIARIZATION AND DEVELOPMENT OF COMPATIBLE USER EQUIPMENT.

NOTE: UNTIL FURTHER NOTICE, 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. THEREFORE THESE SIGNALS SHOULD NOT BE USED FOR SAFETY-OF-LIFE OR OTHER CRITICAL PURPOSES. ANY MILITARY OR CIVIL USERS WHO ENCOUNTER USER EQUIPMENT PROBLEMS FOLLOWING MESSAGE POPULATION OF THE L2C AND L5 SIGNALS SHOULD CONTACT THE APPLICABLE POCS IDENTIFIED BELOW AS SOON AS POSSIBLE. AVIATION USERS SHOULD FILE REPORTS CONSISTENT WITH FAA-APPROVED PROCEDURES.
*** GENERAL MESSAGE TO ALL GPS USERS ***

POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER AT HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
COMM 719-567-2541, GPSOPERATIONSCENTER@US.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514,
COMM 805-606-3514, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

2014039

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014039 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***
REFERENCE NANU 2014038. UPDATE:


THE PURPOSE OF THIS NOTIFICATION IS TO INFORM USERS THAT THE CNAV MESSAGES ON THE GPS L2C AND L5 SIGNALS BEGINNING ON APPROXIMATELY J118/1430Z, WILL INCLUDE BROADCAST MESSAGE TYPES (MT) 10, 11, 30, AND 33, BUT WILL EXCLUDE BROADCAST MT 12.


ADDITIONALLY, THE CNAV MESSAGE HEALTH BITS WILL INDICATE THAT THE L1 AND L2 SIGNALS ARE HEALTHY, BUT THAT THE L5 SIGNAL IS UNHEALTHY. THE CNAV MESSAGE HEALTH BITS MAY FUNCTION INDEPENDENTLY FROM THE LEGACY MESSAGE HEALTH BITS AND SHOULD NOT BE CONSIDERED RELIABLE INDICATORS OF SIGNAL QUALITY OR PERFORMANCE DURING PRE-OPERATIONAL USE.


REMINDER: UNTIL FURTHER NOTICE, 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. THEREFORE THESE SIGNALS SHOULD NOT BE USED FOR SAFETY-OF-LIFE OR OTHER CRITICAL PURPOSES. ANY MILITARY OR CIVIL USERS WHO ENCOUNTER USER EQUIPMENT PROBLEMS FOLLOWING MESSAGE POPULATION OF THE L2C AND L5 SIGNALS SHOULD CONTACT THE APPLICABLE POCS IDENTIFIED BELOW AS SOON AS POSSIBLE. AVIATION USERS SHOULD FILE REPORTS CONSISTENT WITH FAA-APPROVED PROCEDURES.
*** GENERAL MESSAGE TO ALL GPS USERS ***

POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER AT HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
COMM 719-567-2541, GPSOPERATIONSCENTER@US.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514,
COMM 805-606-3514, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

2017122

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2017122 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***
ON APPROXIMATELY 01 DEC 2017, SVN49 WILL RESUME TRANSMITTING L-BAND UTILIZING
PRN04. AT L-BAND ACTIVATION, SVN49/PRN04 WILL BE UNUSABLE UNTIL FURTHER NOTICE.
ADDITIONALLY, NO BROADCAST ALMANACS WILL INCLUDE SVN49/PRN04 UNTIL FURTHER NOTICE.
*** GENERAL MESSAGE TO ALL GPS USERS ***

POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTPS://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER AT HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
COMM 719-567-2541, GPSOPERATIONSCENTER@US.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514,
COMM 805-606-3514, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

2018010

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2018010 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***
ON 07 MAR 2018, AFTER 2200Z, GPS WILL TRANSITION SVN34 (PRN18) INTO THE BROADCAST ALMANAC FOR ALL SATELLITES. THE ALMANAC TRANSITION, ONE SATELLITE AT A TIME, WILL REQUIRE APPROXIMATELY 24 HOURS TO COMPLETE. ALSO, ON APPROXIMATELY 08 MAR 2018, SVN34 WILL RESUME TRANSMITTING L-BAND UTILIZING PRN18. SVN34/PRN18 WILL BE UNUSABLE UNTIL FURTHER NOTICE. FUTURE NANUS WILL NOTIFY USERS OF ANY CHANGES TO THE ABOVE STATED STATUS.
*** GENERAL MESSAGE TO ALL GPS USERS ***

POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTPS://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER AT HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
COMM 719-567-2541, GPSOPERATIONSCENTER@US.AF.MIL, HTTPS://GPS.AFSPC.AF.MIL
MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514,
COMM 805-606-3514, JSPOCCOMBATOPS@VANDENBERG.AF.MIL



GPS Expandable Slot Designations
B D F
B5=B1F D5=D2F F5=F2F
B1=B1A D2=D2A F2=F2A