I am located in the US and recently purchased a 2015 A3 8V with the non-nav MMI unit. I am looking to upgrade to add navigation. The unit I am considering purchasing the main unit, navigation control unit with touch pad, high resolution display and GPS antenna. 1) First and most important - do I need to physically upgrade the main unit in order to activate nav? Someone has mentioned that I do not need to purchase a new main unit. If I do need to upgrade the main unit: 1) Does anyone have any experience upgrading the A3 8V? Can you please help with the steps and installation process? 2) Do I need to visit the dealer to re-program? 3) Do I need any additional parts? 4) Can Audi Connect be used? Separate question: Since I already have the MMI unit, can I add a backup camera to the system such that it is visible on the LCD? Please help!! It is much appreciated! Please excuse my newness to the forum!