I agree with Smoothie --- Regardless of what the "marketeers" say, when my wife and went looking for a new car, we went to Toyota and looked for a new 2008 Camry. The first thing I asked about was the NAV option. The dealer sales lady spent about 30 minutes looking all over the western states for the car we wanted WITH a NAV system, and she couldn't find ONE, AND they would not take an ORDER. So, that was the day we went to lunch and ended up at the Lexus dealer and bought the IS250, WITH a NAV. I doubt the depreciation is going to sway a used car buyer either way. We are in the "gadget" world I think a NAV system is a plus for any buyer, whether or not they want to pay for it.
I believe a built in NAV system in luxury vehicles will be standard feature in the near future.
Were you aware of the free Magellen GPS with the purchase of your Continental tires?
http://ultimate-adventure.contisweeps.com/...mption_form.pdf