How does an iPod touch's location finder(iOS4) work? With wifi turned on, it works. With wifi turned off, it doesn't. How then? What
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allows these feature to accurately sense the location, when its biggest brother(iPhone) needs no wifi to sense the location?
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Answer:
iPhones detect their location using GPS and aGPS (meaning they also get location info from the cellular network). The iPod touch doesn't have these capabilities, so it approximates its location from its WiFi connection, based on IP addresses (which are location-based) and on known databases of where various networks are located.
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