Assisted Gps

Assisted GPS (abbreviated generally as A-GPS and less commonly as aGPS) is a system that can in many cases greatly improve the startup performance or time-to-first-fix (TTFF) of a GPS satellite-based positioning system. It is used extensively with GPS-capable cellular phones, as its development was accelerated by the U.S. FCC's 911 requirement to make the location of a cell phone available to emergency call dispatchers.
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