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I've had a 2007 and now a 2010 E90. Takes a good couple of minutes to start up nav, and after that start up you still have to get satellite lock which can be up to 3-5 minutes longer. Perhaps my GPS is not working properly, or it is due to my area surrounded by buildings. I do not know how fast it is supposed to be under certain conditions, but you can always count on forum members' exaggerations to add to the confusion.
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