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stands for Global Positioning System, a satellite based navigation system
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Why does smartphone GPS find its position much faster than a GPS module?
The other answers have already explained the "how" and "why", so all that's left for me is the "what": it's called A-GPS (assisted GPS, sometimes also called accelerated or augmented GPS). … In other words: the reason why a phone's GPS works faster than a "GPS's GPS" is that the phone isn't using "GPS", it's using aGPS. …