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    Global Positioning System
    The Global Positioning System, originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Air Force. Wikipedia
    Satellites in orbit: 31
    Total satellites: 33
    Orbital height: 20,180 km (12,540 mi)
    Accuracy: 5 meters
    First launch: February 1978; 40 years ago
    Operator(s): AFSPC