I wonder what the split among clubs that RHIB dive is on wearing additional buoyancy over the drysuit?
It's only since moving to England that I have joined a RHIB owning club. That said all the other times I have been out on a RHIB (privately owned or as a charter) I don't ever recall being asked to put on a life jacket.
Some are pressure activated, which generally don't go off, others rely on a dissolving bobbin thingy which most certainly do - the standard as far as I remember is deployment in 30 seconds of immersion so if you are getting wet it WILL go off after using it for a while on most RHIBs: they are not designed for people who are getting wet regularly.
Not over here and we have a far more lax attitude to H&S compared to the Brits.
No one gets on our RIB without a lifejacket not a PFD. Mind you, we have them available for those without.
When I used to do a lot of sea angling, no one was allowed onto the pier to start loading their boat without a life jacket.
Life jackets are dirt cheap. Lives are not
If my post doesnt have a typo, then I have probably been hacked!