They started sending out "production quality" DGPS signals on a limited basis in 1996, and rapidly expanded the network to cover most US ports of call, as well as the Saint Lawrence Seaway in partnership with the Canadian Coast Guard.
•
The United States Department of Transportation, in conjunction with the Federal Highway Administration, the Federal Railroad Administration and the National Geodetic Survey appointed the Coast Guard as the maintaining agency for the U.S. Nationwide DGPS network (NDGPS).
•
The Canadian system is similar to the US system and is primarily for maritime usage covering the Atlantic and Pacific coast as well as the Great Lakes and Saint Lawrence Seaway.
GPS | GPS navigation device | Ordinary differential equation | ordinary differential equation | Prym differential | Precision Lightweight GPS Receiver | power series solution of differential equations | Magnetic Drum Digital Differential Analyzer | Low-voltage differential signaling | Locking differential | List of differential geometry topics | Hyperbolic partial differential equation | Hemisphere GPS | GPS (satellite) | GPS in the Earthmoving Industry | GPS intelligent buoys | GPS eXchange Format | GPs | differential topology | differential interference contrast microscopy | Differential geometry of surfaces | Differential diagnosis |