Daydream believer
Well-known member
Unless your radio is very unusual, you're unlikely to be able to add and remove digits from the MMSI number used for DSC. That is fixed more or less permanently. The number they've given you is to be programmed in as your ATIS number, a facility your set doesn't have, so is pointless. I haven't seen one of these exemption certificates, but I believe it's giving you official permission to have a radio with ATIS (otherwise not allowed in UK, stupidly) which, since you don't have a radio with ATIS, is again pointless.
You're also not supposed to switch to ATIS, if you had it, "when abroad". It's only for the inland waterways system, if you're a coastal boat then you use DSC same as here.
Pete
i have not tried to re programme my VHF but you are correct with my ASI transponder & 2 EPIRBS in that they cannot be re programmed by me so I expect radio is the same
The instruction from OFCOM is to add a digit ( 9) to the front of the MMSI No. UK does not issue dedicated ATIS numbers