r230 sl stereo head unit

Anyone knows where to obtain a sat nav disc for a command system fit in the SL350 of 2003. I would be interested in an original disc, or better so, in a latest compatible updated one. I am both Norwich and London based. Many thanks

Hi - I've only had my MY2005 R230 for two weeks so am still trying to learn all about it! I have a couple of head unit questions, if anyone can help... 1. I have NTG1 Command, I believe (widescreen unit which goes right to edge of centre console). How do I tell if I have BOSE or HK sound...