QUOTE(DavidL @ Dec 18 2009, 10:37 PM)
Correct me if I am wrong; iPhone 3GS and 3G only comes with Assisted GPS which means it utilises GPRS, Edge or 3G connection to detect the signals from the transmission towers and lock your position based on the signals they received from the tower. It does not directly utilises the satellites. It only gives an estimation on your position based on the positions of the towers. Thus, it is faster to lock and are able to use it indoor. Conclusion, fast locking, can use indoor but not accurate.
i believe iPhone3G and iPhone3GS both got A-GPS chip utilising satellite, alongside cellular and wifi signal. the assisted part is for faster lock when location-aware app is launched, before the satellites can give the exact location. so nope, iPhone 3G and 3GS can also get its location via GPS satellite. the one that doesn't have that feature is the original iPhone (can only determine its location via cellular and wifi signals)btw, some GPS makers such as TomTom also already made their own GPS cradle to be used with iPhone 3G & iPhone 3GS, also can be used with iPod Touch. it features GPS chip built into the cradle that can improve the GPS signal receiving.
This post has been edited by thisisit: Dec 24 2009, 06:15 PM
Dec 24 2009, 06:14 PM

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