The Book of Threes

Global Positioning System – GPS

Errors in timing can be corrected by checking the signals against the signal from a fourth satellite. Current systems can pinpoint the location of the receiver with an accuracy of around 5 m (16 ft). The system is used for navigation, surveying, and many other applications. Compare loran.

Global Positioning System

Signals received from four satellites are used to determine the three-dimensional position of the receiver (vehicle). The receiver interprets the arrival times of the signals in terms of latitude, longitude, and altitude.


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Three is the Magic Number

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