Navigation Center Website Top Header Banner
Home | LNMs | Nav Rules | AIS | NAIS Data Request | MSI Data Downloads | GPS Constellation Status | GPS Testing | Almanacs | USCG Int'l Ice Patrol | Contact Us | Search
Nationwide Differential GPS (NDGPS)
Mission Areas
Subscribe / Report (free)
Maritime Information

Print friendly version  

Differential corrections are based on the NAD83 (2011) position of the reference station (REFSTA) antenna. Positions obtained using DGPS should be referenced to NAD 83 coordinate system only. All sites are broadcasting RTCM Type 9-3 correction messages. Please report DGPS problems or outages at our report-a-problem page. Thank you in advance.

Note: The Louisville, KY DGPS Beacon (290 KHZ, Site ID 869) was terminated as of 1200Z (0800 EDT) May 31, 2017.

The Millers Ferry, AL (320 KHz, Site ID 865), Rock Island, IL (311 KHz, Site ID 863), and St. Paul, MN (317KHz, Site ID 864) DGPS beacon signals were terminated as of 1200Z (0800 EDT) June 30, 2017.

For inquiries, please contact the Navigation Information Service (NIS) via our Contact Us page or via phone at 703-313-5900.


Use the pull-down menu below to select the site in which you are interested. Outages, if any, will be shown below the site parameters after you select the site in which you interested.