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B C G H I L N O P R U
GM GP

GPS

Global Positioning System
A satellite navigation system used for determining one's precise location and providing a highly accurate time reference almost anywhere on Earth or in Earth orbit. It uses an intermediate circular orbit (ICO) satellite constellation of at least 24 satellites. The precision of the GPS signal itself is about 20 meters (65 ft). Using differential GPS and other error-correcting techniques, the precision can be improved to about 10 cm (4 in). The GPS system was designed by and is controlled by the United States Department of Defense and can be used by anyone, free of charge.

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