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Nationwide Differential GPS (NDGPS)
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DIFFERENTIAL GPS OPERATIONAL ASSESSMENT REPORTS

Alaska OA CroppedThe Navigation Center periodically collects DGPS data from the field to present a snapshot of the DGPS system's performance. The survey team traverses the DGPS broadcast area logging DGPS data that is then analyzed and presented in a DGPS Operational Assessment (OA) report.

The OA report provides an evaluation of the overall performance of a DGPS site. Within the report you will find signal strength, accuracy, RTCM messages, and GPS satellite constellation data plotted in tables and on a map projection. For questions or concerns regarding the results of an OA, please use the Contact Us page.



DGPS Site

Site ID

Date

Point Loma, CA 881 Dec 2016
English Turn, Louisiana 814 Nov 2016
Millers Ferry, Alabama 865 Nov 2016
Cape Mendocino, California 885 Sept 2016
Pigeon Point, California 883 Sept 2016
Lincoln, California 764 Sept 2016
Cape Canaveral, Florida 809 Aug 2016
Tampa, Florida 827 Aug 2016
Card Sound, Florida 808 Aug 2016
Whidbey Island, Washington 888 Aug 2016
Robinson Pt, Washington 887 Aug 2016
Aransas Pass, Texas 816 July 2016
Angleton, Texas 828 July 2016
Sandy Hook, New Jersey 804 May 2016
Moriches, New York 803 May 2016
Acushnet, Massachusetts 772 May 2016
Austin, Nevada 798 Sep 2015
Myton, Utah 873 Sep 2015
Brunswick, Maine 800 Sep 2015
Penobscot, Maine 799 Sep 2015
Albuquerque, New Mexico 875 Aug 2015
Summerfield, Texas 823 Aug 2015
Appleton, Washington 871 Jul 2015
Cold Bay, Alaska 898 July 2015
Seneca, Oregon 773 Jul 2015
St. Paul, Wisconsin 864 May 2015
Aransas Pass, Texas 816 May 2015
Essex, California 875 Apr 2015
Bakersfield, California 795 Apr 2015
Isabella, Puerto Rico 817 Apr 2015
Reedy Point, Delaware 870 Mar 2015
Annapolis, Maryland 847 Mar 2015
Hawk Run, Pennsylvania 788 Mar 2015
Moriches, New York 803 Sept 2014
Sandy Hook, New Jersey 804 Sept 2014
Hudson Falls, New York 844 Sept 2014
Whitney, Nebraska 859 Aug 2014
Billings, Montana 874 Aug 2014
Polson, Montana 849 Aug 2014
Kokole, Hawaii 880 Aug 2014
Pahoa, Hawaii 877 Aug 2014
Upolu Point, Hawaii 879 Aug 2014
Pine River, Minnesota 841 July 2014
Clark, South Dakota 850 July 2014
Medora, North Dakota 851 July 2014
Potato Point, Alaska 895 July 2014
Level Island, Alaska 891 July 2014
Kodiak, Alaska 897 July 2014
Kenai, Alaska 896 July 2014
Cape Hinchinbrook, Alaska 894 July 2014
Biorka, Alaska 890 July 2014
Gustavus, Alaska 892 July 2014
Annette Island, Alaska 889 July 2014
Hackleburg, Alabama 825 June 2014
Sallisaw, Oklahoma 866 June 2014
Bobo, Mississippi 792 June 2014
Millers Ferry, Alabama 865 June 2014
Fort Stevens, Oregon 886 Sept 2013
Spokane, Washington 848 Sept 2013
Robinson Pt, Washington 887 Sept 2013
Whidbey Island, Washington 888 Sept 2013
Isabela, Puerto Rico 817 Aug 2013
Driver, Virginia 806 July 2013
Point Loma, California 881 July 2013
Lompoc, California 882 July 2013
Card Sound, Florida 808 June 2013
Cape Canaveral, Florida 809 June 2013
Myton, Utah 873 June 2013
Pueblo, Colorado 872 June 2013
Flagstaff, Arizona 876 June 2013
Macon, Georgia 822 Mar 2013
Savannah, Georgia 818 Mar 2013
Vessel Traffic Service area
Lower Mississippi
  Feb 2013
Eglin, Florida 812 Feb 2013
English Turn, Louisiana 814 Feb 2013
Chico, California 878 Jan 2013
Pigeon Point, California 883 Jan 2013
Lincoln, California 764 Jan 2012
Pickford, Michigan 835 July 2012
Cheboygan, Michigan 836 July 2012
Wisconsin Point, Wisconsin 830 Aug 2012
Upper Keweenaw, Michigan 831 Aug 2012
Sturgeon Bay, Wisconsin 832 Aug 2012
Mequon, Wisconsin 777 Aug 2012
Saginaw Bay, Michigan 837 June 2012
Detroit, Michigan 838 June 2012
Topeka, Kansas 765 May 2012
St. Louis, Missouri 862 Apr 2012
Rock Island, Illinois 863 Apr 2011
Klamath Falls, Oregon 791 Dec 2011
Cape Mendocino, California 885 Nov 2011
St. Marys, West Virginia 843 Nov 2011
Hartsville, Tennessee 858 Nov 2011
Louisville, Kentucky 969 Nov 2011
Youngstown, New York 839 Oct 2011
Acushnet, Massachusetts 772 Oct 2011
Hudson Falls, New York 844 Oct 2011
Hagerstown, Maryland 834 Oct 2011
Reedy Point, Delaware 870 Oct 2011
Angleton, Texas 828 Sep 2011
Kensington, South Carolina 778 Sep 2011
Penobscot, Maine 799 Apr 2011
Brunswick, Maine 800 Apr 2011
Key West, Florida 811 Feb 2011