How the iPhone knows where you are
Apple uses GPS, Wi-Fi, and cell towers to get (and map) location data
by Glenn Fleishman, Macworld.com Apr 28, 2011 10:00 am
iPhone users’ experience with GPS is so quick, so instant-on, that Apple’s Wednesday response about location tracking on iOS might almost seem baffling: “Calculating a phone’s location using just GPS satellite data can take up to several minutes. iPhone can reduce this time to just a few seconds by using Wi-Fi hotspot and cell tower data to quickly find GPS satellites.” Several minutes? Doesn’t my iPhone take just seconds to figure out where I am?
For full article via How the iPhone knows where you are | Phones | Macworld.
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