Global Navigation Satellite Systems

“Global Navigation Satellite Systems (GNSS) include constellations of Earth-orbiting satellites that broadcast their locations in space and time, of networks of ground control stations, and of receivers that calculate ground positions by trilateration. GNSS are used in all forms of transportation: space stations, aviation, maritime, rail, road and mass transit. Positioning, navigation and timing (PNT) play a critical role in telecommunications, land surveying, law enforcement, emergency response, precision agriculture, mining, finance, scientific research and so on. They are used to control computer networks, air traffic, power grids and more.” (UNOOSA, 2019)

Sources

"Global Navigation Satellite Systems (GNSS)". United Nations Office for Outer Space Affairs, UNOOSA. 2019.
http://www.unoosa.org/oosa/en/ourwork/psa/gnss/gnss.html.
Accessed February 13, 2019.