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That is true of many or most skills--a dive course not only cannot teach what every condition is like throughout the world, it should not do that. Why fill students' heads with information they may never use, will likely forget, and will have time to learn it should the need arise? For example I did not do a single dive in conditions where the tide made one iota of difference until I had more than 800 dives and visited in your neck of the woods. When I arrived, I learned from locals what I needed to know about diving with the tides, information that should be taught to anyone doing their OW class there. In contrast, we go over diving at altitude with every dive class in Colorado, something a Seattle-area diver may never have to think about.
While PADI encourages dive instructors to train skills specific to your dive conditions, they do not "require" it, as you stated. No agency does. I gave you an example, which I deal with regularly now that I'm dedicating more time to mentoring recently certified divers. Pretty much the default circumstance is that they all know they should dive with a buddy, but none of them were ever taught the requisite skills to actually do it. And you just provided another classic example ... OW students in our area rarely ever learn how to plan dives using tide or current charts, even though as you say it's pretty much a requirement for diving here. An OW instructor can completely ignore that topic and certify a diver completely within agency standards ... PADI's or any other agency's standards. New divers learn that skill by taking a seminar ... like the one my friend Fritz Merkel provides fairly regularly ... which is always done outside the framework of an agency class, usually at dive club meetings or at someplace like the Dive Expo. At best what they'll get from their OW instructor is some mention that they should learn that stuff, but I'm not aware of any current OW instructor in my area that actually teaches it. Certainly it's not an agency requirement.
... Bob (Grateful Diver)