When and where was the GPS invented?

The GPS satellite location system (Global Positioning System) was created in the early 1970s by the US Department of Defense to keep track of their military units. It became fully operational in 1994 and was rapidly adopted for commercial use. The system began with a group of 24 orbiting satellites, which send accurate signals to receivers on the Earth's surface. Comparing these signals to the known positions of the satellites allows precise determination of location, altitude, and relative motion.