Today, not only spacecraft but airlines, shipping companies, trucking firms, courier companies, car rental services and drivers everywhere use GPS to track vehicles, people, follow the best and nearest route to get them from point A to B in the shortest possible time.
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So, to explain the technology in simpler terms, Global Positioning System is a network of circumnavigating satellites that send accurate details of their position in space back to earth.
These signals are received by you through Google maps or receiver which lets you follow and track certain locations.

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