GPS is “Global Positioning System”. it is a satellite-based radio navigation system. GPS itself is made up of three component groups – the satellite constellation, ground control segment, and user equipment. The satellite constellation is often referred to as NAVSTAR (Navigation Satellite Timing and Ranging) and currently consists of 30 satellites. Groups of five satellites loop around the earth in one of six different orbital paths. This allows a system user with a clear view of the sky to have access to a minimum of four satellites at any one time, but more commonly six to eight.

Gps user equipment also called GPS receivers. These range from navigation systems found on planes and in cars to hand held devices now available. A receiver uses signals received from three or more satellites to determine the position of the user.

GPS, or Global Positioning System, is used to fix one’s position on the Earth through the very accurate timing of signals from satellites. It’s applications are many and varied, ranging from aircraft and ship navigation, to geocaching (treasure hunting) for individuals. There are also a multitude of military applications for GPS.

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