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GPS is the global navigation and positioning network. It refers to the constellation of satellites and the ground infrastructure that lets a receiver determine a precise location anywhere on Earth. This term is more specific than just “a satellite” or a generic “network” because GPS is the established system name that provides worldwide navigation and time data. A receiver uses signals from multiple satellites to triangulate position and time, typically requiring signals from at least four satellites to compute a 3D position. The other options don’t fit because a single satellite can’t provide global coverage, and PIN has no relation to navigation.