: The system will detect the card and ask if you wish to use the maps from the SD card or install them to the internal memory.
: Standard SD cards cannot be used by simply copying files onto them because the system checks for a specific, non-writable CID found only on genuine VW cards. The "Hacking" Method
Updating your RNS 315 navigation system doesn't require a trip to the dealership. With the v.4 Map update files and an SD card, you can upgrade your system from the comfort of your driveway. Follow this guide to get started.