GPS - Global Positioning System is a space-based radio positioning, navigation, and time-transfer system.  The system provides highly accurate position and velocity information, and precise time, on a continuous global basis, to an unlimited numbers of properly equipped users.  The system is unaffected by weather, and provides a worldwide common grid reference system.  The GPS concept is predicated upon accurate and continuous knowledge of the spatial position of each satellite in the system with respect to time and distance from a transmitting satellite to the user.  The GPS receiver automatically selects appropriate signals from the satellites in view and translates these into three-dimensional position, velocity, and time.

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