The GPS datasheet accuracy is CEP at 24 hours stationary, a common test condition for GPS.  CEP is a 50% confidence number.  Like other single (non-differential) GPS units, our accuracy is limited by constellation geometry, atmospheric, and clock error effects (largest contributors when selective availability is not included.)  This pegs best performance at approximately 5 meters RMS dynamic.  This is improved for areas where WAAS is enabled.

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