Personaly ,I don't drink on my boat when going out wide , mates can and do , they are old enough to do so responsibly, and never have more than 3 or 4.
But when we go squiding , the stereo is on and the beer flows, usually in the gulf, no more than 200 meters off shore in under 3 mtrs deep . Dragging in squid in the shallows after a few beers is easy, getting 10kg plus up from 120 mtrs while drinking isn't fun, especialy when the men in grey suits are lurking hungrily around, don't need to fall in

. Besides if I have too much the handbrake would come down and drive us home, (boat ramp is only 3 mins away)