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I'm glad you asked. I just got a 2001 VDP and am wondering the exact same thing. I have a feeling there is a NAV CD that is required in order for it to operate, but I really don't know.
Does your car have the navigation DVD deck in the trunk, mounted above the CD changer? If so you have the nav unit. You also need the nav DVD. Some members here have posted sites where it can be downloaded.