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Table 1 Uncertainty sources (95% confidence level) for position, determined from GPS, and the total uncertainty, assuming the normal distribution of the uncertainty sources, high degrees of freedom and a coverage factor, k, of 2

From: Overview of legal traceability of GPS positioning in Australia

Uncertainty source Position uncertainty horizontal (mm) Position uncertainty vertical (mm)
Type A—Experimental error 2 6
Type B—Antenna phase centre 3 10
Type B—Monument stability 1–20 1–40
Type B—Other sources including un-modelled crustal loading, satellite orbit variations, atmosphere, tectonics, signal multi-path 6 10
Total 7–21 15–43