As AMSA reported in the past, due to the increased accuracy of GPS and introduction of other global positioning constellations, like GLONASS, GALILEO and Beidou, its Differential Global Positioning System (DGPS) service is no longer needed. As a result, AMSA will discontinue DGPS system from the following summer, specifically on 1st July 2020.
At the moment, GPS is one of the several Global Navigation Satellite Systems (GNSS), offering accurate Position, Navigation and Timing (PNT) data to...
https://safety4sea.com/amsa-discontinues-dgps-from-1st-july-2020/