GPS tracking on your phone hooks up to a satellite. In case of
emergency and 911 is called they use a satellite system to be able
to pin point exactly where you are.
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The first tracking system was created in 1957 by Roger Easton
for the specific purpose of tracking the orbit of the Vanguard
satellite. Easton went on to develop the Naval Space
Surveillance.
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A terrestrial system for satellite communication is one that
facilitates. This includes the facilitation of audio, data, and any
other communication.
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Security control and fleet tracking are completely different
systems. If you use a satellite based fleet control system that
tells you where your vehicle is if it's stolen however.