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Global Navigation Satellite System (GNSS) provides accurate positioning, navigation, and timing information using a constellation of satellites, ground control stations, and user receivers. The primary GNSS include GPS (USA), GLONASS (Russia), Galileo (EU), and BeiDou (China), offering worldwide coverage. The integration of GNSS with Geographic Information Systems (GIS) greatly ___ _____ ________ ___ ________ _______ _____ ________ ____ _____ ________.
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