It's one of the main questions holding me back from getting an RNS510 to be honest. I have been trying to research it and it seems the maps are supplied by Navteq. I seem to recall some people getting the Euro maps from a BMW update disc and managing to upgrade their RNS510's, but it seemed a bit hit and miss (http://www.gpsunderground.com/forums...ead.php?t=7857).
There is also a tool called "POI inspect0r" that you can use to mash up your own update disc with your own point's of interest (POI) which might evolve to being able to update the maps yourself too? (http://vwnavi.com/forums/showthread.php?t=10041)
As nice an all-in-one integrated unit as the RNS510 is, the question marks over it's future-proofness is really a deterrent.
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