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I had a single din Harmon Kardon Trafficpro in my old boxster. It has navigation but no big screen, just turn by turn directions on a little screen. There are no current (or even recent) map updates available for it either, but at the time in 2006 to 2008 it was adequate. They come up on ebay occasionally but I am sure for the same money you can buy one that is much more advanced now.
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