GPS.md

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 The Global Positioning System (GPS) is a US-owned utility that provides positioning, navigation, and timing services.
 
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 ![NAVSTAR_GPS_logo](uploads/446e0c0b20e7d5046a421a3441262307/NAVSTAR_GPS_logo.png)
 
 **In the context of the Cold War**, in response to the launch of Sputnik by the Russians in 1957, the Americans worked on a program to enable the terrestrial positioning of mobile devices using radio emissions from a satellite. Thus, in **1960**, the US Navy made the first concrete use of satellites for land positioning. The NAV.S.T.A.R-G.P.S (navigation system time and ranging - Global Positioning System) system was then designed, financed and developed in 1973 by the United States Department of Defense for strictly military use. The first satellite was launched in 1978. The system was declared operational in 1995, with 28 satellites in near-circular orbits around the Earth at an angle of 55° to the equator and 60° to each of the other orbits at an altitude of 20200 km. They go around this orbit in 11 hours and 58 minutes. **There are currently 30 active satellites.**