DGPS corrections are broadcast from medium frequency radiobeacon transmitters located to cover selected marine areas and waterways. The broadcasts are continuously monitored for integrity. The performance of the DGPS service has not been validated and it should be used with caution.
Additional stations are in the process of being added to the system.
In addition, some test bed stations remain in operation. These signals are experimental and should not be used under any circumstances where system failure or inaccuracy could constitute a safety hazard. Additional information on the use and operation of DGPS will be announced through Notices to Mariners . Positions obtained using DGPS should be referenced to this datum. Follow the links below to view maps showing station coverage and caracteristics.