overall I'm with MNB.. for most driving they're a bit frivilous -- give me a good map book and I'm ready to go. Maybe that's the outdoorsman in me coming out
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Another pilot two cents opinion. If you don't know where you are going get yourself another brain. A map and knowing which way is North, South , East and West gets you there the same way. Where these systems would be nice if they had a real time uplink driving conditions for metropolitan areas and avoiding traffic back ups.