Reference Terms
from Wikipedia, the free encyclopedia

Global Positioning System

The Global Positioning System, usually called GPS, is the Earth's only fully-functional satellite navigation system.

A constellation of more than two dozen GPS satellites broadcasts precise timing signals by radio to electronic GPS receivers which allow them to accurately determine their location (longitude, latitude, and altitude) in real time.

Note:   The above text is excerpted from the Wikipedia article "Global Positioning System", which has been released under the GNU Free Documentation License.
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