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Understanding GPS : Global Positioning System

GPS or Global Positioning System is space-based global navigation satellite system (GNSS). GNSS is used for satellite navigation system with global coverage. GPS provides location and time information in all weather, anywhere on Earh (where there is an obstructed line to four or more GPS satellite). GPS is maintained by United States goverment and available to anyone with GPS receiver.

gps satellite

Other satellite positioning systems available are GLONASS from Rusia, Compass

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