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GPS·C, short for GPS Correction, was a Differential GPS data source for most of Canada maintained by the Canadian Active Control System, part of Natural Resources Canada. When used with an appropriate receiver, GPS·C improved real-time accuracy to about 1–2 meters, from a nominal 15 m accuracy.

Real-time data was collected at fourteen permanent ground stations spread across Canada, and forwarded to the central station, "NRC1", in Ottawa for processing.

Visiting the external webpage for this service on 2011-11-04, there is only a note saying that the service had been discontinued on 2011-04-01. There is a PDF link on that page to possible alternatives.


  • CDGPS 1
  • Shutdown 2
  • See also 3
  • References 4
  • External links 5


GPS·C information was broadcast Canada-wide on MSAT by the CDGPS, short for Canada-Wide DGPS Correction Service. CDGPS required a separate MSAT receiver, which output correction information in the RTCM format for input into any suitably equipped GPS receiver. The need for a separate receiver made it less cost-effective than solutions like WAAS or StarFire, which receive their correction information using the same antenna and receiver.

CDGPS Reference Stations[1]
Station name Location Operational Date Coordinates
ALBH Canadian Forces Base, Esquimalt, British Columbia (near Victoria, British Columbia) May 1992
ALGO Algonquin Space Complex, Algonquin Provincial Park, Ontario January 1991
CHUR Geological Survey of Canada regional seismic station, Churchill, Manitoba April 1993
DRAO Dominion Radio Astrophysical Observatory, Penticton, British Columbia February 1991
EUR2 New Environment Canada Weather Station building, Eureka, Nunavut October 9, 2005
FRDN Hugh John Fleming Forestry Complex, near the University of New Brunswick in Fredericton, New Brunswick February 2003
HLFX Bedford Institute of Oceanography, Dartmouth, Nova Scotia December 19, 2001
NRC1 Institute for National Measurement Standards, National Research Centre, Ottawa, Ontario April 1995
PRDS Dominion Observatory in Priddis, Alberta (near Calgary, Alberta) January 7, 1997
SCH2 Transport Canada radio telecommunication facility, Schefferville, Quebec June 29, 1997
STJO Geological Survey of Canada (NRCan) geomagnetic observing station, St. John's, Newfoundland May 1992
WHIT Whitehorse, Yukon June 1996
WINN NavCanada Winnipeg Area Control Centre building, Winnipeg, Manitoba January 9, 1997
YELL Yellowknife, Northwest Territories January 1991


On April 9, 2010, it was announced that the service would be discontinued by March 31, 2011. The service was decommissioned on March 31, 2011 and finally terminated on April 1, 2011, at 9:00 EDT.[2]

See also


  1. ^ "Active Control Point Stations". Retrieved 2006-11-27.  (login needed)
  2. ^ Gary Sawayama (April 1, 2011). "CDGPS Termination Announcement" (PDF) (Press release). Retrieved August 3, 2012. 

External links

  • CDGPS (Canada-Wide DGPS Correction Service)
  • GPS·C Distribution Using NTRIP — PDF format
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