Deferential GPS is a method to enhance GPS accuracy. Usually DGPS can we found at harbor it function to help ship navigation to dock. DGPS is very useful to located reef or shipwrek
DGPS Correction is broadcast from GPS that have RTCM (Radio Technical Commission Maritime). RTCM is GPS standard format for all GPS to sent and receive data from one GPS to another. RTCM has many version from 1.2 until now 3.1. RTCM version 3.1 has ability to enhance accuracy with Glonass satellite.
Navigation GPS that has accuracy maximal 6 meters can be enhance to 1-2 meters if GPS get Correction signal from DGPS. And for mapping can obtain below one-meter accuracy.
Thx to AS @ id-gps
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