I've noticed, on more than one occasion, that my Navi is not showing my actual location, but is off by sometimes a mile or more. I don't think the weather was a factor, because the two times I noticed the discepancies, the weather was fine. The only constant was this happened after leaving my office parking garage which requires me to navigate a circular ramp for four floors or more. Could the constant turning in circles cause the navi to temporarily lose its accuracy? The problem did self-correct after driving a few miles.