The nav in the Z4 is the same as the nav in the e46 and the tail end of the e39 so there really isn't anything extra in it. It just a map that's always there and a better way to look at the mpg, average speed and whatnot. Also it has a setting so it will beep if you cross a set speed.
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Straightaways are for fast cars, Corners are for fast drivers.
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