Ms. Ann Thrope
Contributor
I kind of think of the DM tip as mostly being for their guidance underwater and assistance on the boat--the switching of the tanks, the giving of the weights, the hauling of your heavy gear up over the side of the boat after you surface so that you can climb up the ladder unburdened, the offering of fruit, the passing out of water, the geniality, the fact that they've learned my language so that I don't have to spend my brainpower botching theirs, their help if there's a problem, etc. That's way more of the tipping quotient for me than if they or another shop employee loaded my BC etc. onto a handcart and took care of my gear in my absence. What that all is worth to you is up to you, of course.