Which program provides Worldwide Positioning, Navigation, Timing, and Velocity Information?

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Global Positioning System delivers worldwide positioning, navigation, timing, and velocity information because it is a satellite-based system that broadcasts precise time signals from orbiting satellites. A receiver uses signals from multiple satellites to determine its exact 3D position and its clock error relative to GPS time; from the satellite timestamps and the measured travel time of the signals, the receiver resolves both location and precise time. Velocity comes from the Doppler shift of the received signals, which tells how fast the receiver is moving relative to the satellites, and with successive position updates you get the velocity vector. Because the constellation provides global coverage, this information is available anywhere signals can be received. Other programs focus on space surveillance or weather data rather than global navigation and timing.