iPad accelerometer-and-compass-based GPS.

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i'm wondering. ipad has accelerometer , compass. there app can calculate location based on starting point is, direction youre facing , accelerometer readings?

this: tell app i'm @ home. proceed take car out of driveway. turn west. in meantime, car accelerates 25 mph. because app knows way i'm headed, how fast i'm going , started should able calculate without gps receiver or internet connection.
 

which ipad talking about? wifi or 3g
 


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