Can you upgrade to the NAV unit at a later date. My 06 C did not come with the Nav, is it possible to add the OEM Nav unit at a later date. Also how is the nav unit and functionality, is it worth the upgrade.
Well worth the upgrade. You can add it without a problem. You'll need to get the silver trim bezel for the dash as well as the NAV unit. Keep your eye on Ebay - they come up there from time to time.
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