GPS·C, short for "GPS Correction", is a
Differential GPSdata source for most of Canadamaintained by the Canadian Active Control System, part of Natural Resources Canada. When used with an appropriate receiver, GPS·C improves real-time accuracy to about 1-2 meters, from a nominal 15 m accuracy.
Real-time data is collected at fourteen permanent ground stations spread across Canada, and forwarded to the central station, "NRC1", in
GPS·C information is currently broadcast Canada-wide on
MSATby the CDGPS, short for "Canada-Wide DGPS Correction Service". CDGPS requires a separate MSAT receiver, which outputs correction information in the RTCMformat for input into any suitably equipped GPS receiver. The need for a separate receiver makes it less cost-effective than solutions like WAAS or StarFire, which receive their correction information using the same antenna and receiver.
* [http://cdgps.com/ CDGPS]
* [http://ess.nrcan.gc.ca/2002_2006/gnd/cdgps_e.php CDGPS (Canada-Wide DGPS Correction Service)]
* [http://igs.bkg.bund.de/root_ftp/NTRIP/documentation/12_Macleod.pdf GPS·C Distribution Using NTRIP] —
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