Hi all. I want to fit sat nav into my A6 but i am not sure what i need. I have the mmi already in the car but when i press the nav button it just says "nav not installed". Can anyone tell me what i will need to have it working corectly and how easy will it be to install. I have looked in the boot and on the left hand side there is a cage which looks like thats where the dvd drive would go. Will i need to run any cables to the front of the car or will they already be in. Any help would be grateful. Thanks.