- GPS---- global positioning system is a space age version of triangulation.
- A GPS was originally developed for military use.
- There are satellites roaming around earth for signals of the GPS.
- When a GPS user is on land or sea calls satellites roam around earth for signal.
- In the U.s GPS system the Navstar sratellites orbits the earth for around for about 12 hours.
- GPS signals are broadcast on military and civilian use.
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