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Global Positioning System (GPS)

How does the navigation system find its way? The Global Positioning System (GPS) enables the electronic navigator to make the correct route recommendations. In this system, which was originally developed for military purposes, 24 satellites orbit the earth on exact paths. These satellites continuously transmit signals which are detected by the GPS receivers. The signals from three satellites have to be received for a device to determine its position within a range of ten metres. Using the road maps stored in its memory, the navigation system converts this information into route recommendations.