Agree with Pseto, if they where providing that info that would be great, but my experience with nav systems integrated in cars (mostly on bmw loaners) where a pain in the neck. Besides you never get your money back when you re-sell your car and a portable one can be taken to another car, boat, etc. And new ones come every so often it is not worth (at least to me) paying an extra 1,500 or more for something that will be obsolete in 6 months.