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The GDOP (Geometric Dilution Of Precision)is the precision loss factor:
it characterizes the influence of satellite geometry when measuring the position of a GPS receiver. The lower the GDOP value, the better the accuracy of the measured position.
The real-time map
This map informs you of the status of the stations in real time.
You will also find the detailed information of each station: ID (station acronym), RTCM, nSV (number of satellites tracked), the coordinates of the station in GF93 (latitude, longitude and ellipsoidal height) as well as all the constellations tracked.