Positioning with GPS
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GPS = Global Positioning System
Utilization of individual satellites. Without the aid of a corrections signal to increase precision
Positioning with DGPS
DGPS = Differential Global Positioning System
EGNOS (European Geostationary Navigation Overlay Service): satellite transmitter of a corrections signal
or GPRS corrections signal sent by the "Office fédéral de topographie" [Federal Office of Topography]: SWIPOS-NAV.
This signal, combined with the others, increases precision to within a few decimetres