While I agree that OW divers should be able to dive unsupervised in conditions similar to the conditions under which they were certified, I also think most OW divers are certified under pretty benign conditions. Even if the conditions were fairly difficult, there are always more difficult conditions, and there are more complex plans possible than are normally taught in recreational diving. Even though I had dived in many locations around the world, it was only relatively recently that I did a dive where dealing with tides made a difference, and I was very glad I had knowledgeable local friends to guide me to good decisions. I am sure that if those friends had visited me and done a dive with me at 11,600 feet, I could have returned the favor with some tips on dealing with altitude. There are dive plans where good gas management skills and related knowledge are vital. I think that in many locations an unsupervised diver needs to know about dive flag rules, and in other places they should know how to deploy an SMB. A lot of emergency preparedness information is good to know.
And so, diving unsupervised can entail a lot of skills and knowledge not usually taught in dive classes. Consequently, I created PADI distinctive specialty in advanced dive planning. It covers pretty much everything I could think of that might be necessary. I made the outline freely available to ScubaBoard instructors when I made it, and quite a few took me up on it. It is possible that an instructor near you might have submitted it and will thus be authorized to teach it.
And so, diving unsupervised can entail a lot of skills and knowledge not usually taught in dive classes. Consequently, I created PADI distinctive specialty in advanced dive planning. It covers pretty much everything I could think of that might be necessary. I made the outline freely available to ScubaBoard instructors when I made it, and quite a few took me up on it. It is possible that an instructor near you might have submitted it and will thus be authorized to teach it.