NAV or being cutting edge high tech has never been necessary for me. But generally speaking,, app head units are the wave of the future. The Z's stock nav is already borderline obsolete and outdated... car audio is progressing way too fast and the design of the Z stock nav won't allow you to upgrade. You would have to trade the whole car to keep up with the jones', if that's your sort of thing??? Non nav, all you have to change is the head unit.
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