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Others learn how to weave good baskets in the same way humans have learned new skills since the dawn of time - mentorship and prudent self-study.many people take a class if they want to weave a good basket without making a bunch of needless mistakes.
Nitrox.
Sometimes Deep can be useful, but only as pre-requisite to certain Tech Courses.
Ice Diver should be pretty good..... although there is an Urban Legend that an Egyptian Instructor (who has never left Egypt) has this Specialty rating. So shop around.
I know the guy in question but ive never actually seen the card to prove it...
It does show the issue though in a way - i've self certified for quite a few specialities but have never once been asked for log books or verification of relevant experience. I had to show my Adv. Trimix card applying for self-reliant instructor but that's it. Everything else immediately approved.
Last year I was thinking about doing wreck specialty. My instructor told me that it was pretty much a waste of time so I didn't do it.
However in the past I did Nitrox, Ice diving and drysuit and they were all useful. Rescue is also a must. Beside that, other specialties look to me as basket weaving
Hostage:I am planning on doing Nitrox and Wreck Diving for sure. I think one of the guys who teaches wreck diving, discovered a wreck near Rochester.
RU4SKUBA:As a lifeguarding professional I felt like Rescue was fluff, but again, it truly is about the instructor. Most of my Rescue class was done in 4 ft of water (both in pool and on lakeshore) and I personally didn't feel like he was well enough trained to be teaching any rescue course and managed the class badly. It was really hard to get over, and to make matters worse, he hid his inadequacies poorly.