When on motor yachts with enclosed wheel houses it doesn't seem like you need to wear one as there's a wall and doors between you and the open. The trouble is then that you can forget to put a jacket on when you nip outside to get something.
I had a bad experience coming up from victoria dock, caernarfon to Fleetwood.
It was a nice calm day going through the menia straights, as we went past the pier and dickies yard I left everyone on the fly bridge to go and make a bacon butty and a brew. We came around the north side of Puffin island and I was climbing the open backed ladder to the fly bridge when we suddenly hit very deep swells as the sea hit the mouth of the river. I was flung off the side of the boat but managed to hold on with my left hand. Looked abit like I'd just star jumped off the boat
As the boat then came violently back up I was catapulted back onto the boat, ending in a heap just under the davits. First thing I thought was I didn't have a life jacket on and screamed blue murder to everyone up top to make sure they still had there's on.