A 46 Newton is a big boat and I've seen one Miami operator put 38 divers at a time on a 2 tanker trip. Getting alot of divers back on board and seated efficiently/quickly is really important if a slight wave action. The newer divers can more easily keep their fins on and quickly climb the ladder to be then led by a deck hand to their seat. The christmas tree ladder in my opinion, retrieves divers twice as fast as a closed loop since newer divers don't have to 'thread' their fins into the steps. Taking fins off prior while in the water is again, more time consuming than getting them up & seated especially when there is wave action. If wave action is serious, we'll have the divers climb the christmas tree with fins on, then stop on the transom deck and double team them pulling off their fins and 1 person escort them to their seat. If you have enough deck hands, I would put double christmas tree ladders right together in the center which still allows for departing divers to jump off the corners of the transom. It's just about speed and efficiency of getting divers out of the water and into their seat, especially in wave action.