A GPS receiver fixed in one place will know exactly where it is. Any position derived from the received GPS signals can be compared with its known position and any error deduced. If this error was transmitted to the nearby GPS receivers, they could take account of this error in deducing their own position to give a much more accurate result, with a 95% probability error of 3 metres. This is known as differential GPS (DGPS).
To take advantage of this, the GPS receiver needs both a separate DGPS receiver and to be within range of a DGPS station, usually about 200 miles. This is commonly used for survey GPS and was beginning to be common for leisure users until selective availability was switched off, when its need for normal leisure use disappeared because of the inherent 15-metre accuracy.
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