I know that it’s mostly “approximate”.
But, I must know the EXACT location of the phone, regardless of battery life or whatever.
I need the exact location of the phone! Is it possible?
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It depends on what you mean by exact!
Any location technology will have a level of accuracy and much of this depends on the hardware your using. Mil spec GPS will cost a lot more than the chipset in your iPhone and use a lot more power too.
The best I’ve managed to get using the browser with iPhone 3GS GPS in wide open space is +/-17m
Usually its best to design you application around this for example most turn by turn sat-nav assumes you must be on a road and correct the location for this.