Differential GPS (DGPS) is an enhancement to the Global Positioning System (GPS) that provides improved location accuracy. DGPS uses a network of fixed, ground-based reference stations to broadcast the difference between the positions indicated by the GPS satellite system and the known fixed positions. Receivers can then correct their GPS positions based on this differential signal, significantly improving accuracy. It's commonly used in surveying, agriculture, aviation, maritime navigation, and other applications where precise location is critical.
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