You can update the disc for the sat nav to get road layout changes, but it doesn't add extra functionality like postcodes unfortunately. Once you get used to the sat nav I find it's actually a very good system, I found it really useful when trying to drive over the Swiss alps and the route was taking me on the train underneath, just grab a way point and drag it to the twisty roads, et voila. Postcodes and speed cameras would be a nice addition though.