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GM online tech support was able to provide some good information. Both the MyLink and MyLink with NAV radio might show a NAV icon on the screen, but only the MyLink with NAV radio actually includes the functional GPS. There is no subscription service required for this MyLink NAV function and it does not rely on an OnStar subscription either. If you are planning on buying a 2015 C7 and are unsure whether you have the NAV function, [as AUX_man notes above] look for the IO6 option. In my case I had visited the dealer but didn't look close enough at the options on the window sticker, but I was able to give the GM online rep the VIN number and they were able to immediately send me the complete build sheet. They were very helpful. Looks like a 2015 Shark Gray C7 will be in my garage soon!
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