Diff: GPS

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+GPS is an acronym for '''G'''lobal '''P'''ositioning '''S'''ystem.  GPS is used to track the location of a GPS receiver anywhere on the face of the planet. 

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+There is an excellent section on the (http://www.trimble.com/ Trimble) website titled (http://www.trimble.com/gps/ All About GPS) which explains exactly that.