GPS
While the current iPhone location services find your position by triangulating among nearby cell phone towers and satellites, the iPhone 3G uses Assisted GPS supplemented by satellites, which better pinpoints your location. It also offers live tracking so that you can monitor your progress as you drive (or walk) along. We'll expand more on the tracking feature as we test it. Even with these additions, however, the iPhone's GPS features can't compete with a standalone GPS device. Google Maps provide point-to-point directions on the iPhone 3G, but the phone doesn't support turn-by-turn directions in real time, and it's unclear whether that capability will come later from third-party applications. Apple's SDK prohibits location-based services "designed or marketed for real-time route guidance," but that doesn't mean we'll never see them.
While the current iPhone location services find your position by triangulating among nearby cell phone towers and satellites, the iPhone 3G uses Assisted GPS supplemented by satellites, which better pinpoints your location. It also offers live tracking so that you can monitor your progress as you drive (or walk) along. We'll expand more on the tracking feature as we test it. Even with these additions, however, the iPhone's GPS features can't compete with a standalone GPS device. Google Maps provide point-to-point directions on the iPhone 3G, but the phone doesn't support turn-by-turn directions in real time, and it's unclear whether that capability will come later from third-party applications. Apple's SDK prohibits location-based services "designed or marketed for real-time route guidance," but that doesn't mean we'll never see them.
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