Thanks Kev. That was where I started, and still see as the simplest (and least costly) solution, but soon got involved in various other options. After some consideration late last night, top option now is to find a suitable upgrade for the standard RDS 5000 ICE unit that would include inbuilt SAT NAV, and facilitate an additional AV input from a remote camera. I know I might be setting the bar a bit high, and any pointers to a suitable ICE upgrade would be very welcome.