Satellite Navigation Systems, including: Global Positioning System, Galileo (satellite Navigation), Glonass, Transit (satellite), Beidou Navigation ... Integrity Monitoring, Geographic Data Files

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More info: Global Navigation Satellite Systems (GNSS) is the standard generic term for satellite navigation systems ("sat nav") that provide autonomous geo-spatial positioning with global coverage. GNSS allows small electronic receivers to determine their location (longitude, latitude, and altitude) to within a few metres using time signals transmitted along a line-of-sight by radio from satellites. Receivers calculate the precise time as well as position, which can be used as a reference for scientific experiments.