OK I just got my RNS_D installed. The stereo works great and the Ice link works like a charm. The only thing not working is the nav unit. I checked the disc and it is really scratched so this may be one issue but as I was doing some reseach and I found you have to modify a couple things on your nav cd to have it work. After reading instructions I feel I can do it.
So here are my questions, can I use the audi CD I have (all the instructions say use the Blaupunkt CD to modify) I just have the normal audi nav cd.

Second, is this even an issue I have to worry about or should I just by a new cd.

Thanks