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Selective Availability: the intentional degradation of the timing and position information transmitted by a GPS satellite
PDOP: (the position dilution of precision); describes the amount of error due to the geographic position of the GPS satellites.
Multipath: an error caused by a delay in the signal due to reflections from the surfaces before reaching the receiver.
DGPS: (differential GPS); a method of using a ground based correction in addition to the satellite signals to determine position.
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