zug list is for mmi control unit mapping of hardware and sw versions.Post a full log of your sw versions and ill explain when i get a min.Please bare in mind that updating mmi sw versions can wipesome control units ie telephone and bose amp and ami.The sat nav cd rom differances are upto date map location 3d mapping tmc display graphic improvements,i dont own a audi a i am a audi master tech so maybe ask some of the owners running 2007/08 nav cd rom for the full changes.As for gps aerial the retro fit kit should explain the aerial instalation as all the rear windows have the position for the fitment and you just stick it there for the optimum signal.Again sw updates can be exspensive if they crash a file and where did you get your sw discs from out of intrest
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