It has been a problem for many 2002 and up c230 owners to put aftermarket navigation in the vehicle and have it work properly. Anyone in southern California who wants this done should contact us over here at Gold Star Audio in Irvine, CA. We have already done this in 6 05' c230's as well as countless '02 and up. We will beat any prices on the Kenwood or Pioneer double din nav units, we also make custom dash kits for the 05 and up (no dash kits are made for this car). Please let us know if we can help you get up and running. We also do audio/video and are authorized dealers for JL, Saav, Diamond, Boston, Infinity, OZ audio, Kenwood, Sony, Pioneer, JVC, Farenheit along with many others. Please feel free to call us at the number listed below or PM me, thank you.
Thank you,
Jay
General Manager
(800) 9STEREO
Some of those aftermarket units are pricy and don't integrate into the dash display and steering wheel controls like the factory unit which you can get on ebay and some resellers for anywhere from $800-1,200 for the 2002-2004.5 and fits into that non-DIN hole without any adapters and such.
this is very true, and probably is the best bet for most people on here, but there are many other people who are looking for video, and a good unit to power a full sound system that they are putting in their vehicle.