Quote from Miketsp: "Now that's one of the things where I have a personal preference and I would get upset. I know the pros and cons of this have been discussed in other threads but I like to set up my gear and then close the air. By the pressure drop during the trip out I know what leaks I've got. If I get back to my kit and find somebody has turned it back on I don't know.
Turning my air back on is a major item in my pre-dive check, as is watching my SPG for a pressure drop while I fill my BC and test my regs, so I'm not going to forget it." End of quote.
That's something where, if a customer told me, I'd be happy to let them do it, of course. Generally, we like the air shut off on the way out...noisy boat, leaking Octopus, can't hear it, whatever. I think most of the people involved in diving enough to frequent these various message boards are fairly competent and are fine left to their own. In a resort location, (like Guam) we get crowded boats full of people who dive once or twice per year, and really can't even set up their gear. The guide has to be sure SOMEHOW, that the air is on, and gear is okay before the divers hit the water....and avoid ruffling anyone's feathers in doing so. If a diver drops in the water, and sinks to the bottom without the air being on, the DM can't really say "I don't verify air is on, because some people are offended that I'm implying they can't do it themselves." In most cases, of course, this can be done without actually touching the person's gear, if need be....watching them turn it on, or watching them breathe & watch the SPG....all the things a good diver like yourself obviously does before entry. I have a bit over 5,000 dives now, but when I'm about to do my entry, if there's a deckhand at the entry point, he'll reach over (as he does with all the customers) and check that my air is on. I KNOW it's on already, but it reassures the deckhand that it is, and only slows me down for a second....unless he hangs onto the valve AS I jump in, ha ha....I've seen that happen. A pressure on DMs is that we're often working with "the lowest common denominator," meaning in a group of divers, we'll have some who really need us just to survive the dive. It shouldn't be that way, but it is. I try not to baby my customers or treat the experienced/good divers like they just got their OW card yesterday, but I DO get people who got their OW card yesterday (or worse, a year ago, and haven't been diving since) and those people need, umm, extra supervision.
Well, I REALLY am off to work now...just dropped a customer off at the airport, and now I'm heading out to dive, so I'm done here for the day.