I'd like to retrofit SatNav to a 2002 ML320. I've taken out the radio that I currently have an it appears that there are a lot of additional (currently unused) cables in the wiring loom behind the unit which I assume are for SatNav. One looks like an aerial plug and another looks like an RJ45 socket. There are many others. Are these used for SatNav ? I'm assuming that when the car was built, it had a "standard" wiring loom included which allows for SatNav to be retrofitted without a significant amount of additional wiring.

My other question is what head unit(s) would be suitable for this car ? I've seen several different versions and want to know which would work. I'm assuming the answer is not just "any double-din" unit - it must be more specific. If anyone has any part codes for units which they know work on this model of car, I'd appreciate any posts.

Thanks in advance