Could somebody please tell me that I am right in thinking that the New A3 comes with Sat Nav hardware already installed regardless of if you take the Sat Nav extra? If this is the case, if you choose to get the Sat Nav at a later date, does this just basically mean you are paying £500 for the SD card with the required maps and software? If so, does anybody know any good websites where you can download the software and maps? Surely you can just copy this to an SD card, pop it into the slot and away you go???