Three questions:
1. Do you think the USCG will require operational DSC one day on inspected vessels or are they happy with re-broadcasting the message to anyone around?
2. How do you handle guests with the Lifeline onboard? Just tell them the frequency to use, make test calls, try not to get involved?
3. What is the proper protocol for a diver to call a boat using a lifeline? It's not like we have a boat name.
In Australia, all VHF operators must be licenced. If you have a Lifeline it is registered to you, and you must have a name. Mine is "Seal Diver 1". If Australia rescue get notified, then they have all your details. I have both Lifeline and PLB.