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TSandM:
DivingCRNA:One of the nice things about the bp/w is it's simplicity. You are not overloaded with a bunch of stuff you do not use on your dive.
timle:SMB and Reel - safety equipment for free ascents in open water + surface attention getter
shears - line cutter, etc
whistle - surface attention getter
reflector - surface attention getter
You should have some sort of line cutter, etc on every dive
You should have a some surface attention getting devices on any ocean dives where you could get left behind or swept away from the boat.
I don't see anything on this list that I wouldn't take on an typical boat trip.