GPS Error. Atmospheric effects Multipath Satellite geometry Measurement noise Ephemeris data Satellite clock drift Selective availability (SA). Ionospheric & Tropospheric Refraction. Multipath. Satellite Geometry Geometric Dilution of Precision (GDOP).
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SA on (100 meter spread)
SA off (3 meter spread)
Shaw, Michael, Kanwaljit Sandhoo and David Turner, Modernization of the Global Positioning System, GPS World Magazine, September 2000
* Minimum of 4 satellites, maximum PDOP of 6, minimum SNR of 4, minimum elevation of 15 degrees, baseline <= 250 km (155 miles) low multipath conditions