Outage information is shown below each site. It is requested that users notify the
Navigation Information Services Watchstander at (703) 313-5900 or
via email
regarding any observed outages, problems, or requests.
The U.S. Coast Guard DGPS service is available for positioning and navigation;
however, users may experience service interruptions without notice. U.S. Coast Guard
DGPS broadcasts should not be used under any circumstances where a sudden system
failure or inaccuracy might constitute a safety hazard.
Differential corrections are based on the NAD 83 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.