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Global Navigation Satellite System. A satellite navigation system is a system that uses satellites to provide autonomous geo-spatial positioning. It allows small electronic receivers to determine their location to high precision (within a few metres) using time signals transmitted along a line of sight by radio from satellites. The system can be used for providing position, navigation or for tracking the position of something fitted with a receiver (satellite tracking). The signals also allow the electronic receiver to calculate the current local time to high precision, which allows time synchronisation. Examples of GNSS are the United States NAVSTAR Global Positioning System (GPS), the Russian GLONASS and the EUs Galileo are global operational GNSSs.

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