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Nationwide Differential GPS (NDGPS)
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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 following DGPS beacon signals were terminated on September 30, 2018.
  • Pigeon Point, CA (287 KHZ, Site ID 883)
  • Robinson Point, WA (323 KHZ, Site ID 887)
  • Annapolis, MD (301 KHZ, Site ID 847)
  • Bobo, MS (297 KHZ, Site ID 792)
  • New Bern, NC (294 KHZ, Site ID 771)
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.