Another recommendation for Sena I have two sets on the boat, not used often ,had them years just recharge them up each time we remember to use them and they work very well, also have Sena headsets built into our motorcycles helmets, have tried a few other makes over the years, Sena are by far the best, no connection with company just a happy customer
This thread might be worth a read In boat communications
I started the thread back in 2013
At the time, I couldn't find a good solution so I built my own.
And then ending up finding the Sena ones.
I even did a write up in MBY
I think you will find that thread a good read and might answer some of your questions.