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The Global Positioning System
GPS is a satellite navigation system that allows users to locate their approximate position on Earth. There are 27 satellites orbiting Earth, as shown in the below picture, for use with GPS units. The satellites are positioned around Earth, and are constantly orbiting so that signals from at least three or four satellites can be picked up at any given moment by a GPS receiver.
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To use GPS to find your location on Earth, you need a GPS receiver. The
The Global Positioning System
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Source: http://javedshaikm.wordpress.com/2012/10/19/the-global-positioning-system/
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