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  1. oya

    Info The Rule of 120

    I use a form of ballpark dive planning that is taught by one of the most well-regarded agencies on the planet. As a cave diver following mandatorily non-square profiles (gotta be at whatever depth the cave dictates) that are symetrical (the cave going out is the same as the cave going in), so...
  2. oya

    Info The Rule of 120

    Super weird that all my Shearwaters seem to think so. You should write the programmers and get them to write a patch.
  3. oya

    Info The Rule of 120

    I ripped it off of GUE. I don't know (or really care that much) what GF they used to figure it. I think, maybe 30/80? Using average depth as the depth vector it's agreed with my computers within a minute or two for hundreds of dives. I use a 45/85 on my wrist.
  4. oya

    Info The Rule of 120

    I (loosely... because in practice I use a dive computer because I live in the year 2022) use the rule of 130. Obviously the same general idea. Also: for the second dive, after a 90 minute surface interval you get 75% of the time.
  5. oya

    Passing Jump lines

    Ignore them. Or, at most, make a mental sticky-note about it as a waypoint... but an unreliable one, because that jump line may not be there anymore when you get back. More importantly: do NOT mark them yourself. A case can be pretty easily made that you're interfering with their jump which...
  6. oya

    Finances and Tec Diving

  7. oya

    Lessons Questionable science/validity of the Dunning-Kruger Effect: Implications for competency self-assessment in diving.

    I'm gonna go with about a 9 on a scale of 1-10. 1 being "I know my own name."and 10 being "I don't really care."
  8. oya

    Lessons Questionable science/validity of the Dunning-Kruger Effect: Implications for competency self-assessment in diving.

    A: I find it enormously delightful that a bunch of people on the internet who (presumably) have done no research whatsoever as trained and experienced social psychologists are working together to determine the validity of a study in social psychology about people who don't know what they're...
  9. oya

    I don't know. Yeah... there... I said it.

    Here's a little ditty I put together as a blog post, but figure some of the ideas are worth distribution to a wider audience than the 10-12 misfits who have nothing to do other than read my blog. ------------------------------------- A great deal - if not the majority - of attention around...
  10. oya

    Is horizontal position really better?

    I've recently started checking in on SB again after some time away. And this thread keeps showing up near the top of "New Posts" for reasons I don't quite understand. Yes. That's the answer Yes it is. For a variety of reasons. https://www.xoc-ha.com/post/just-a-trim Next!
  11. oya

    Hello from Brooklyn NY

    Hello back from a Brooklynite (Brooklyner? Brooklynoan?) living in Mexico. What gear specifically are you looking to get? Happy to answer any questions, talking for (almost certainly) longer than you’re willing to stay awake. PM or goggle XOC-Ha for my email. Also, if you’re looking to...
  12. oya

    Tulum Recommendations

    Protec has a good OW program: https://protecdivecenters.com/open-water-courses-2/ You might also try Underworld Tulum: https://underworldtulum.com/ Though both tend to focus more on cenotes, they may have availability and have top-notch instructors who really care with a ton of experience and...
  13. oya

    Question Cave diving instructor in Fiji?

    Proper cave diving (and, subsequently, cave training) depends on a certain type of geology. Vast limestone deposits that have been allowed a few tens of thousands of years to get eroded into karst. Fiji, as volcanic islands, lacks such a geology. I'm sure there are plenty of sea caves and...
  14. oya

    The Isolation Manifold, lessons not learned and a small defence of the IUCRR

    Sure. It could be those things. It almost certainly won't be, though. A neck o-ring isn't going to randomly explode underwater (though I have seen that once). I've seen burst discs go, of course. During filling. But valve handles, the mechanisms under them, I've seen them go on a meagre...
  15. oya

    The Isolation Manifold, lessons not learned and a small defence of the IUCRR

    A left or right post valve failure would result in total gas loss in fairly short order.
  16. oya

    Question How to choose between Under the Jungle (MX) or GUE Cave 1 (FL) ?

    It seems a bit like you're asking two different, but related, questions. If the question is Mexico vs. Florida that's one thing. If it's UTJ vs GUE that's another. I'm going to address the second question first because it's a little easier. The way GUE instructors train and the way Nat...
  17. oya

    Easy PSI/BAR Conversion

    Excellent advice. I admit that I'm coming at this from more of a tech/cave diver's viewpoint where we don't really report pressures to one another; we've either got enough to continue or we thumb the dive, that's about the scope of pressure conversation. I'm also coming at it from more of a...
  18. oya

    Easy PSI/BAR Conversion

    I'm always confused when people who are good with math tell people who are not good with math, "Just do the math better. It's easy." As if it hadn't occurred to me to just do that instead. Kind of folks who tell people who just slipped off a roof to get up and walk it off.
  19. oya

    Easy PSI/BAR Conversion

    Americans, let's take it as a given that the whole rest of the world uses metric. Whether you like it or not is irrelevant... it just is. You don't see me screaming about how gravity is corny and that we never got a sequel for Buckaroo Banzai, do you? No. Because I've simply accepted that it...
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