[reneadam]

Does anyone know how I can tell if I have an RNS-D or RNS-E Nav Plus system?

 

[AudiA4B6US]

If you are using CDs as map and buttons on the left and right side of the screen, then you have the CD Nav Plus RNS-D. If you are using DVDs as map, if your device can read SD cards and has only button on the right side to of the screen, then you have the DVD based RNS-E. if you don't have any screen for your Audi navigation system and just an OEM radio, then you have the BNS system...