- GPS refers to the U.S. Department of Defense’s GNSS (Global Navigation Satellite System), also known as NAVSTAR. There are other GNSS around the world including the Russian GLONASS, the Chinese Compass and the planned EU Galileo system however NAVSTAR is the only fully-functioning GNSS at this time.
- The first GPS satellite was launched in 1978.
- A full constellation of 24 satellites was achieved in 1994.
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