hi -
they occasionally pop up on ebay. there was one when i posted. don't know of any other place, and this is certainly not very frequent (but if you have the time and patience, it should work out).
hope that helps.
Anton

Hi,

Was looking at a thread that you commented on. I'm also looking for a Navman Control box (part G600).

Do you by any chance still know where I can find such a part?

Where are you situated?

Best regards

Robert
Trimax