reset the mmsi on the navman radio on the rib using advice from here, so it can be done easily if you have the correct sequence of buttons to press. Worked fine, thanx guys. Only problem after that was that the backlight died a day later and I cant get that back. New radio methinks.
We also reset the mmsi on a boat we were delivering from Ireland by sea. When we looked at the radio menu on the pre trip checks the prev owner had set the mmsi at 123456789, no doubt to get the digital bits of the unlicensed set working. A fone call to the manufacturers resulted in the stock advice that we had to send it back. When we told him our situation and the journey we had to do he gave us the sequence to use to clear it...along with the request not to tell anyone. Hence no manufacturer name on this bit.