I have heard it differs somewhat from instructor to instructor, but that it is a more predictable offering than most other scuba classes...
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I may be (and probably am) mistaken but doesn't a person enrolling in a DIRF class have to be a certified diver?
As for the PADI group you mentioned--I think there is considerable difference between an OW cert class and a group taking DIRF class. I may be (and probably am) mistaken but doesn't a person enrolling in a DIRF class have to be a certified diver?
I am curious about one more thing if you don't mind. If you had to choose just one thing about your DIRF class; what would you consider to be the most valuable lesson you had, that will apply to any future diving you do?