I'm gonna take a stab at this one... my guess is that the accuracy of the GPS is off a little... my dad had a big boat with a GPS plotter system on it and it would regularly show his boat parked out in the street when he was on his lift on the canal... his explained that GPS systems are based on military satelites and they have the ability to LET you have closer accuracy but choose not to. He said that during the Gulf war they had a shortage of military GPS systems so they inlisted more civilian GPS units and then unlocked the satelites to show accuracy within inches as opposed to the usual 20'-30' accuracy that civilian units would have. Now... with that being said, I'm not sure how completely accurate that is, but coming from my ol' man, I expect its pretty dead spot on. Hope that makes some sense.
Coach... I mean Randy (I often forget who I really am)
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