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GPS
GPS or Global Positioning System is a location system designed to triangulate any point on the planetary surface, or in the skies above it.
It works via a receiver unit at the position to be checked, which has an internal clock, and a microwave receiver to receive signals from orbiting satellite or stratellite systems. The user does not have to transmit anything to the satellite and the satellite does not know the user is there.
The precise time delay for the clock tick of the microwave signal sent gives the distance to each satellite, with an error based on the accuracy of the receiver's clock.
By determining the position of, and distance to, at least three satellites, the receiver can compute its position using triangulation between them.
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