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Guest
As far as the drysuit goes, it would be well within their rights to evaluate your proficiency prior to letting you dive it on their boat.
Homemade CCR, with no training, you would be asked to either not dive, or rent some OC gear. There is no chance that I would allow an untrained CCR diver on my boat.
Why is this my stance? Because I am the poor guy that has to retrieve your corpse.
So where is "your boat" just in case there is a crowd of divers looking to join you?