Global satatelite position refernce systems DP
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Global Positioning Reference DP PRS
Global Navigational Satellite Positioning Systems.
The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites

(GPS)The Global Positioning System is a space-based satellite navigation system that provides location and time information anywhere on or near the earth where there is an unobstructed line of sight to four or preferably more GPS satellites. The system provides critical capabilities to military, civil, and commercial users around the world. It was created by the United States Government who maintain it, It freely accessible to anyone with a GPS receiver.

The GPS system concept is based on time. The satellites carry very stable atomic clocks that are synchronized to each other and to ground clocks. Any drift from true time maintained on the ground is corrected daily. Likewise, the satellite locations are monitored precisely. GPS receivers have clocks as well—however, they are not synchronized with true time, and are less stable. GPS satellites continuously transmit their current time and position. A GPS receiver monitors multiple satellites and solves equations to determine the exact position of the receiver and its deviation from true time. At a minimum, four satellites must be in view of the receiver for it to compute four unknown quantities (three position coordinates and clock deviation from satellite time). (source Wikipedia)

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Global Positioning Reference DP PRS