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DGPS
DGPS or Differential GPS is a system which demands GPS signals be accurate to within 10 metres at all times. It was initially devised by the US coast guard, and has since been adopted internationally as the standard for sea and air-borne traffic location.
DGPS works by adding an additional GPS marker to the standard set-up. A fixed, land-based DGPS reference receiver acts as a zeroing point, to strip errors from triangulated GPS signals. It is triangulated with the exact same collection of satellites and stratellites as the target vehicle, then it works out the difference between it's exact, known position, and that given by triangulation, relaying the correction details to the vehicle's GPS system.
Slightly slower than normal GPS, DGPS is notably more accurate, but DGPS does require an added beacon receiver to communicate with the standard GPS unit.
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