I did my DM pool work with a primary donate system, but with a 40" hose routed under my arm. It kept my reflexes the same, but avoided the snorkel problem.
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To the best of my knowledge there is no agency that mandates having a snorkel attached to your mask. Such a configuration is ideal for snorkelling but pretty stupid for scuba diving. I have met a few (2 or 3 at most) divers over the years that believe a snorkel has some use whilst surface swimming (I am not part of this group). Most kit configurations would allow the stowage of such a device for deployment at the surface, a BC pocket for example. Since the snorkel has no application whatsoever once submerged wearing it whilst underwater would appear to be a rather odd thing to do. Attaching it to your mask where it could entangle with other equipment is not just odd but idiotic.
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To my knowledge, PADI always requires a snorkel for everything--as a student or dive pro. .
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When doing demos ... such as in a pool for OW students ... I'd leave the long hose home and use the standard recreational primary/octo configuration.
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So would I. I think that is the best practice. No need for a snorkel though.
It definitely could be. Several years ago, one of our CAs - an AI, in fact - was working with a OW class, wearing a mask-mounted snorkel, and using a long hose. One of the OW students had a problem (on a platform, at 20 ft) and spit her second stage out. The CA went to donate her primary to the student and in the process knocked her own mask off, so she was 'blinded'. Now, there was a panicked OW student without a regulator in her mouth (who started to bolt to the surface), and a blinded CA without a regulator in her mouth. In the end all turned out 'OK': the instructor was appropriately working with another student but maintaining good peripheral vision, and intervened with the panicked student, while the CA went to her necklace reg, and a DMC retrieved the mask for her. But, by all accounts it was something of a cluster. So, the issue is very real, and can have serious consequences.When we did our out of air scenario and i removed my 7ft hose to give to the out of air diver it caught on my snorkel and took a few seconds to untangle it before i could get it to the diver (which could be an issue if this happened again and is not a scenerio).
Perhaps, a more germaine issue: as a dive professional, you should be facile, and fairly consistent, in the use of your equipment. Ultimately, you want to find a configuration that allows you to dive safely, and comfortably, and perform whatever tasks you need to perform (e.g. function as a DM). So, simply being able to 'survive tomorrow' is probably not the best solution. As an Instructor, I wear my mask on my snorkel for convenience. But, I don't use a long hose when I do. That doesn't achieve the 'consistency' I might otherwise prefer, but it is a practical solution, for me.Now, its a problem only when I have my snorkel on, which is only for class. So I can survive tomorrow, but I start my DM on Wednesday and am not sure if I must have my snorkel throughout the course.
YES.1. Do I have to have it through my DM?
As others have said, don't re-route the long hose. That will just create alternate problems. Attach the snorkel to your rig, where it is easily accessible for use and demonstrations. And, oh by the way - the instructor for the DM course may have her / his own thoughts on what equipment s/he wants you to use (or not).2. . . is their another way to route the long hose so this isnt a problem if i have to use a snorkel in the future?