GPS·C, short for ''GPS Correction'', was a

Differential GPS Differential Global Positioning Systems (DGPSs) supplement and enhance the positional data available from global navigation satellite systems (GNSSs). A DGPS for GPS can increase accuracy by about a thousandfold, from approximately to . DGPSs c ...

data source for most of

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

maintained by the Canadian Active Control System, part of

Natural Resources Canada Natural Resources Canada (NRCan; french: Ressources naturelles Canada; french: RNCan, label=none)Natural Resources Canada is the applied title under the Federal Identity Program; the legal title is Department of Natural Resources (). is the dep ...

. 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

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 The Radio Technical Commission for Maritime Services (RTCM) is a non-profit international standards organization. Although started in 1947 as a U.S. government advisory committee, RTCM is now an independent organization supported by its member org ...

format for input into any suitably equipped GPS receiver. The need for a separate receiver made it less cost-effective than solutions like

WAAS The Wide Area Augmentation System (WAAS) is an air navigation aid developed by the Federal Aviation Administration to augment the Global Positioning System (GPS), with the goal of improving its accuracy, integrity, and availability. Essentia ...

or StarFire, which receive their correction information using the same antenna and receiver.

Shutdown

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.

References

External links

CDGPS (Canada-Wide DGPS Correction Service)GPS·C Distribution Using NTRIP
— PDF format {{DEFAULTSORT:GPS C Global Positioning System Natural Resources Canada Lists of coordinates Satellite-based augmentation systems