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When I first got into the Audi A6 3.0T, I thought that something had gone wrong with the MMI, because when I pressed the nav button, the system told me navigation wasn't installed. I thought this was a software glitch, as I've never seen an MMI-equipped Audi without navigation, but a little research revealed the Q7 and the A6 come with a full MMI system but no navigation. Bummer. I know I'd be upset seeing that nav button and not having the $1800 option.