Nav systems fitted to the new Mk7 VW Golf are named the Discover and Discover Pro, and presumably these take over from the previous RNS 315 and RNS 510 systems. Not used one myself but just found out from VW that the map updates are free for these systems. Not free from VW, but free from Navteq. If you want to go to VW and get them, they will sell you them on an SD card.
They can be downloaded from here.
www.navigation.com
