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  1. boulderjohn

    Is this the most difficult skill for new scuba divers?

    I believe this may illustrate a problem with instruction--actually several problems, including the poor instruction provided in this video. In this video, he talks about the problem caused by divers tipping their heads back while clearing the mask. As a new instructor, I saw the same thing...
  2. boulderjohn

    OW failure, advice?

    The phrase that was used was "cannot really swim." This is a favorite argument of people who criticize RSTC standards. They argue that, "sure, the student met the RSTC standards for swimming, but that's not really swimming. When I talk about really being able to swim, I mean...." So when they...
  3. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    I am completely baffled by this. A young woman, a student in a class, decided she needed to make a quick ascent to the surface from 6 meters and evidently held her breath in violation of the first thing you are taught in scuba. You seem to be saying that this proves that it is absolutely...
  4. boulderjohn

    Suit filed in case of "Girl dead, boy injured at Glacier National Park

    I believe a lot of people do not understand what this means. For instructors who teach for a dive shop, it is the dive shop that sets the conditions of their employment. It tells them what to do. I tells them when to do it. The instructor is an agent of the shop. If the shop tells the...
  5. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    IF he didn't, I did. THe problems is that you never answered the question. You think you did, but you didn't. As I will try again below, I asked WHY you need to reserve enough air to do a 9 minute ascent from 80 feet, and the only answer you gave to the question (WHY?) was that Jarrod Jablonski...
  6. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    I thought I would add a comment on some of the disparaging remarks about the dive planning done by recreational divers who don't know their SAC rates, etc. Here is the kind of diving these beginners do: They dive along and take an occasional look at their gas levels until they reach the point...
  7. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    I stayed out of this all for awhile, and by participating as I finally did, people may not realize that I have not actually given any information about what I feel about the great pony bottle controversy. I have done oodles of recreational dives all around the world--check my profile. I doubt...
  8. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    That isn't really the question, although in the case of a panicked OOA diver it certainly might be. The question is why is it necessary for an OOA team to ascend that slowly?
  9. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    Not really, but to a certain extent it would help. You are insisting that the OOA team do a 9 minute ascent, and the reason for that has to come down to that sort of thing, doesn't it? A couple years ago I worked with Dr. Simon Mitchell and published an an article on ascent profiles in...
  10. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    This does not answer my question. I asked you WHY divers need to follow a minimum deco ascent profile during an OOA event. What is the reason for it? Please cite references to research indicating that it is necessary to do so in an emergency, not just the opinion of the guy who made it up.
  11. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    So the established procedure was established by those who agree with it, and if someone disagrees, they can say "Hey! You can't argue with it! It's established!" In my example, the diver started with the stage, so it was turned on right away and then later turned off at a certain point...
  12. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    Really? By whom? What gave them the authority?
  13. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    How will that help this discussion? Why can't you tell me in a sentence or so why it has to take 9 minutes for an OOA diver to go to the surface from 80 feet on an NDL dive?
  14. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    ...or maybe they disagree.
  15. boulderjohn

    NO SECOND DIVES! ANY IDEAS?

    I have not participated previously because I have never seen exactly what the OP describes, but I have seen something similar. Unfortunately, I will say upfront that I have no explanation, and many years ago a thread I started on the topic provided no help, either. I sometimes have a similar...
  16. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    I thought you might be interested in a planning sequence for the coming movie Harry Potter and the 100-foot wreck. First scene: Harry is on the boat,assembling his gear. He is diving air in a single cylinder. Not sure that he has enough gas to do the dive he plans, he clips on an AL 40 clearly...
  17. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    Why would it take 9 minutes to ascend from 80 feet? How is that valuable? Prove to me that a minimum gas plan is necessary in an OOA situation. Several years ago, I asked in a thread for GUE divers to explain the theory behind min deco. I got a lot of contradictory answers. One of the most...
  18. boulderjohn

    Recreational Pony Bottles, completely unnecessary? Why or why not?

    There is nothing in the PADI literature calling for divers to do a safety stop during an OOA event on an NDL dive. They could do one of they had the gas, of course, but the agency does not call for it. For the 80 foot dive mentioned above, I assume your average pair of divers doing an OOA ascent...
  19. boulderjohn

    OW failure, advice?

    We can figure it all out easily. How many were actively instructing and evaluating student skills? How many were mostly observers who did gopher-type activities? EDIT: I just realized that with the standards violations identified above, it would not be beyond expectations for assistants to...
  20. boulderjohn

    OW failure, advice?

    The time a class takes could be significantly reduced if you actually had 3 instructors compared to 1 instructor and 2 DMs. In a class of 8 students with one instructor and 2 DM assistants, the instructor demonstrates a skill and then evaluates each student's performance on that skill while...
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