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In page Global Positioning System:
"The disadvantage of a tracker is that changes in speed or direction can be computed only with a delay, and that derived direction becomes inaccurate when the distance traveled between two position measurements drops below or near the random error of position measurement. GPS units can use measurements of the Doppler shift of the signals received to compute velocity accurately.[1] More advanced navigation systems use additional sensors like a compass or an inertial navigation system to complement GPS.[citation needed]
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