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Hmmm, will have to check standards on this, but that does not make sense. I am not sure but I would venture no, but am open minded. My reasoning is the hierarchy of PADI leadership vs. NAUI leadership. In NAUI DM comes after AI and has all rights and privileges of AI. In PADI DM comes first. I will have to dig out standards and verify.
There's a thead from a few years back that touches on who can assist whom for PADI and NAUI. (The thread itself is mostly about training requirements for leadership-level ratings in the two agencies.) One formerly active poster, Walter, wrote this:
In regard to whether a PADI DM is of a sufficient ranking to assist in a NAUI course, the professional progression is as follows:
PADI: Divemaster -> Assistant Instructor -> Open Water Scuba Instructor -> Master Scuba Diver Trainer
NAUI: Assistant Instructor -> Divemaster -> Instructor
Therefore, if a NAUI AI is the rating equivalent to a PADI DM and NAUI (by definition) considers a NAUI AI a certified assistant, then the PADI DM rating is sufficient to assist in a NAUI course.
It says that 'Leadership members of other training organizations with corresponding ratings also qualify.' To me that means that an AI with another agency can function as an AI with a NAUI class, but due to the Leadership order/hierarchy in PADI I would say a PADI DM cannot function as an AI in a NAUI class.