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The Global Positioning
System (GPS) is a constellation of 28 satellites, that provide
information to a GPS receiver, so that software in the receiver can determine
a position in three dimensions (altitude, latitude, and longitude).
Originally developed by the U.S. Department of Defense for use in precision
weapon delivery, the initial satellites were launched between 1974 and
1977. During the Clinton administration, use of the system's additional
bandwidth was opened for civilian use. This move, combined with recent
advances in personal technologies were the catalyst for an explosive surge
in GPS market opportunities and intelligent applications.
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How
DirectTrack uses GPS for Vehicle Tracking