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  1. boulderjohn

    First PADI Recreational Backmount Doubles Certification Issued

    At the start of your dive, you simply stretch out your arms and legs in different directions. The first time you do it, you will see how it changes the way your drysuit undergarments are fitting you. Most people who dive drysuits know this, and I know I teach it to my students. You don't have to...
  2. boulderjohn

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

    I don't know when you are talking about, but PADI's Tec Diving program was under the subsidiary DSAT (Diving Science and Technology) until maybe a decade or so ago. The course existed, but there is a good chance your instructor knew nothing about it. There is a very good chance OW instructors in...
  3. boulderjohn

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

    Languages evolve constantly. What you are doing here is using one definition of the word "recreational" as a reason to contradict people who are using another very common definition. Divers have been using the word "recreational" to differentiate from "technical" diving for decades. It is a...
  4. boulderjohn

    Push Notifications

    I realize this current discussion is absurd, but I thought I would like to step in and say that the sentence "Methinks you doth protest too much." is incorrect grammatically for two reasons. 1. You are using "you" in its modern, singular sense but pairing it with an archaic singular verb form...
  5. boulderjohn

    Dive boat etiquette and buoyancy check

    That is usually because of a failure to get all the air out of the BCD.
  6. boulderjohn

    Dive boat etiquette and buoyancy check

    The problem is that in most cases, the weights and tanks are supplied on the boat. To check it out before hand, you would essentially have to rent gear for a shore dive.
  7. boulderjohn

    Dive boat etiquette and buoyancy check

    What you describe is a very common problem, and I wish I had a good solution for you. In many of the dives in that location, getting a buoyancy check before diving will be difficult. If it makes you feel any better, even divers with a ton of experience have this problem when they are using...
  8. boulderjohn

    Info Diving at Altitude

    Thanks! I enjoyed looking at those from an historical perspective, but nothing in them has really changed much in the ensuing half century. Of course, the biggest changes are in the tables they reference and the fact that most people use computers today.
  9. boulderjohn

    Info Diving at Altitude

    Theoretical depth tables like this one are not hard to find, and I assume they are used in all recreational level altitude diving classes today. What I have noticed at all levels of diving, including technical diving, is that people who know about these tables don't understand why they exist...
  10. boulderjohn

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

    I do, too. If I am planning to go into deco on a dive, I treat it as a technical dive from the start. If I am thinking I might be close to deco on the dive, depending upon the situation, I may bring along redundant gas just in case something unexpected happens.
  11. boulderjohn

    Scuba Shack's Boat Get Wet Sinks in Key Largo

    The boat went vertical quickly, so anyone who was in or even near the forward compartment would have been in an overhead environment and going down fast very quickly. A whacked head would be possible. It would be hard to swim out from there as the boat is probably sinking faster than the victim...
  12. boulderjohn

    If you could change one thing about dive training...

    Yes, not giving students enough practices setting up their gear is a violation of standards. It happened to me when I was certified. So, yes, I think we can all agree that instructors should have their students do everything required in the standards. Is there anyone arguing otherwise?
  13. boulderjohn

    Age, Health, Certification and Trim

    I am a little confused about this part. Is this happening in class, or are you just trying this in a swimming pool on your own? If this is happening in class, something is wrong with your instruction. You should never get to 12 feet while experiencing ear and mask squeezes. You should be...
  14. boulderjohn

    If you could change one thing about dive training...

    That was precisely my experience as well. In the first shop where I worked, the Director of Instruction absolutely refused to use online learning. In class after class, students would show up for the class sessions not having done a blessed thing. I politely told them they would have to come...
  15. boulderjohn

    If you could change one thing about dive training...

    I don't know how other agencies do it, but in the ones I know you can't "squish" the online learning part unless you have someone doing it for you. The lessons have check quizzes, and you can't move from one to another without passing those quizzes. In contrast, you can easily squish a student...
  16. boulderjohn

    If you could change one thing about dive training...

    I must have missed the posts in which people were advocating using online learning as a substitute for the skills portion of OW training instead of only to replace the academic (book-learning) part. I am unaware of any agency that does this at all.
  17. boulderjohn

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

    It occurs to me that a problem may be that some people firmly believe that the same rules and procedures need to apply to all diving, while others prefer to believe that different dives can be treated differently. I first had this thought while muck diving a house reef in the Philippines. On...
  18. boulderjohn

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

    The irony in my statement was too subtle. Sorry. Let me explain. Hartattack's argument assumes that the diver will be so vigilant in monitoring gas supplies and so conservative in reserve planning that will be impossible for the diver to run out of gas. He also assumes that catastrophic gas...
  19. boulderjohn

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

    As I understood his argument, Hartattack said that redundancy was not necessary as long as you watched your gas carefully and always began your ascent with enough gas to ensure that you and another dive sharing air could ascend using the GUE ascent profile. He said (incorrectly as I understand...
  20. boulderjohn

    Do you really understand your computer, or is it a threat to you?

    Buhlmann's work did not include the very popular feature known as gradient factors. Those were created by Erik Baker in the 1990's but did not become a factor until much later. I don't know of any computers using them at all until about 10 years ago--if that. Today it seems like that is the...
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