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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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I don't know how precise the gps is, but, the iphone is pretty cool for position locating. It has four modes; GPS, tower triangulation, known tip address location, and inertial. --inertial can takeover for driving thru tunnels, when the GPS craps out.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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