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If you are really looking into getting a Nav system I would suggest at least looking at the small hand held ones. I have a Garmin GPS V and have found that it has 90% of the functionality of the big dash mounted ones, however it costs way less, can be put in your pocket and requires zero installation. I take it everywhere I go, especially on business trips when I have to get a rental car and don't know anything about the city I am visiting.
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