I don't see how not having a Nav is a deal breaker in the used car market. When buying a used car, a buyer seeks out a particular, year, model, engine, color, interior, condition, transmission, etc. Having a Nav is probably like #20 down that list. Buying a used car isn't like buying a new car. You often have slim pickings and you take what you can get. If you can find any car in the year, make, model, color, and engine that you desire, it's considered a win. It's hard enough to meet those five criteria points, let alone a specific option like Nav.
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