Stumbled across this earlier today...not sure if ts common knowledge or not!
On http://www.rns510.de" onclick="window.open(this.href);return false; (open in chrome and set translate to English on), select your language, then find New Features.
You'll see there's an option for "picture navigation" - clicking on it takes you to the vw German site, where you can upload images, associate them with an address, then save then to an SD card with GPS co-ordinates embedded in the images.
You put the images in a folder called GPS-pictures on the sd card.
Pop the card in the rns510, and navigate to a new destination.
Select SD card, and the thumbnails of your pictures will appear - just hit the one you want, and route planning starts!
Have fun!
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