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You do not want the factory NAV. Its a waste of money and will not work.
I have sold alot of my C6 NAV packages to people who have the factory NAV and do not like it. The are changing out to Kenwood and Pioneer. Kenwood NAv is Garmin based and the new Pioneer Z110 BT is a nice match to an Iphone if you have one.
Let me know more questions and i can put something together just for you.