Which system provides autonomous geo-spatial positioning with global coverage and is widely used in surveying?

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Global Navigation Satellite System is the framework that enables autonomous geo-spatial positioning anywhere on the globe by using satellites to determine a receiver’s location without external references. It covers multiple satellite constellations—GPS, GLONASS, Galileo, BeiDou—so receivers can track signals from several systems for better coverage, reliability, and accuracy, which is essential in surveying. While GPS is a widely used system within GNSS, GNSS itself refers to the entire global framework, making it the best answer when describing global, autonomous positioning used in surveying. GIS is just software for storing and analyzing geospatial data, not a positioning system, and PRS92 is a local geodetic reference frame, not a satellite-based positioning system.