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Satellites are working for us in many ways, one of these is for navigation. This technology operates by using an in car receiver which accepts a continuous signal emitted by the satellites. Knowing how long it takes for the signals to reach us from the satellites, the receiver is able to work out the distances. By cross-checking with at least 4 satellites, the receiver can calculate position very accurately..
This principle can be used for all forms of transport ? road, rail, sea and air and the basic system remains the same: The Sat Nav receiver operates as a co-pilot in simultaneous contact with many satellites. The new European Galileo system will have a constellation of thirty satellites revolving in 3 circular orbits approximately 24 000 kilometres above the earth. This will create a network covering the entire globe, relayed at ground level via stations monitoring the satellites and the quality of their signals.
For road transport Galileo has a