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Old 03-06-2013
Shinook Shinook is offline
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Re: iPhone4 and iPad2 w/o 3G

The iPhone GPS isn't really accurate enough for "precision" navigation on it's own, it is most effective combined with other sources of input. You'd be better getting a receiver designed for your given purposes. I've had the receiver show me between 10-15 miles off my actual location before and take upwards of 30 minutes to get an initial fix.
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