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  1. dmaziuk

    Diving stats

    No, but if you could could get your software into all PADI-affiliated dive shops, and get all certification data from PADI, then you could run the stats OP asked for. (IRL PADI would have a better chance of getting the numbers from the shops -- exported from your software -- and doing the totals...
  2. dmaziuk

    Info Deeply Safe Labs: A website for dive computer testing

    You'd have to have a model that models physiology to begin with. M-values are derived from statistics. If the sample they are derived from is representative of the population as a whole (as it seems to be), then they do account for 25% chance of PFO, shunts, the fact that some people have a lot...
  3. dmaziuk

    Equipment Fatality: Trapped cleaning city tank - Blair, Wisconsin

    -- https://madison.com/news/state-regional/wisconsin-blair-water-tank-death/article_62552b54-eb5b-11ee-aa7a-0f41a0c53ad9.html The temperatures here have been oscillating around freezing, I would not get into any large volume of water in a wetsuit, myself, and most definitely not for 45 minutes.
  4. dmaziuk

    Is certification necessary for shallow water diving?

    FWIW I killfiled Flipper long time ago so I don't have to ponder that question.
  5. dmaziuk

    Info Deeply Safe Labs: A website for dive computer testing

    That is indeed how ZH-L model works. Generally speaking, since the off (in this case) -gassing is a log curve, it never goes down to zero, resulting in a residual build-up in the slower tissues over repetitive dives. Exactly how much, can be controlled by adjusting your tissue compartment...
  6. dmaziuk

    Diving stats

    Theoretically PADI, SSI, CMAS, etc. could do it: each knows how many people it certified, and has their ids, and also has the numbers of their affiliated dive shops. Said shops, when organizing dies typically record the agency, member id, and (self-reported) dive count of the participants. The...
  7. dmaziuk

    When is ZH-L16C GF not ZH-L16C GF? When it is a G2 Tek computer

    I use the computer to track my dives so when my computer tells me my tissue loading changed, it is because I spent some time at some pressure. As I said before, you may use yours differently.
  8. dmaziuk

    Dive Computer advice please

    Yes: if you actually understood what you're doing (*), you've set you GFs to 20/60 for a reason. That reason is why you should sit the next 24 hours out. *) Well, if you really did, you wouldn't have set your GF Hi below 75 and Lo: below 55, but that's a whole 'nother can of worms.
  9. dmaziuk

    Vertical vs Horizontal Perception of Distance

    Nope. I'm talking about the top platform on that photo: 10 meters up. I forget at what age they moved us into that open-air pool: I started at 6yo and we swam in the indoor 25m pool (in the building behind the photographer's back) for a while, before they let us in with the big boys. I don't...
  10. dmaziuk

    Vertical vs Horizontal Perception of Distance

    BTDT, the well is the size of a postage stamp from up there and you have to aim very carefully to not miss it. Of course we were maybe 10 at the time and not supposed to get up there in the first place, so it was all very exciting.
  11. dmaziuk

    Dive Computer advice please

    I've gotten close to NDLs and over them, and somehow I never managed to get my computer into deco violation lock-out. 🤞One just has to Read The Fine Manual and pay attention. Up to a point, obviously: I am told one can plan a "technical" deco dive in Suunto DM5 and dive it with a Zoop, but I...
  12. dmaziuk

    Dive Computer advice please

    It's a good thing most of them don't, then. Now, if you omit mandatory deco, and are at "unacceptably high" risk of DCS, they may refuse to work because it doesn't make sense that you would continue diving, and because mathematically they can't compute you any useful advice: you're well into...
  13. dmaziuk

    Is certification necessary for shallow water diving?

    Sure we can: there are zero deaths among untrained divers, therefore untrained divers are 100% safe. Also immortal.
  14. dmaziuk

    Unknown 14 drifters rescued - Maldives

    I got nothing from Russian-language searches, except that judging by the number of "Dive Maldives" ads, I am entirely unsurprised 10 out of 14 of them were Russian.
  15. dmaziuk

    Question Deserved DCS hit even with deco cleared due to high exertion during the dive?

    Also was there anything particular that happened to the one grade 2 DCS case, or was it just an unfortunate statistic?
  16. dmaziuk

    When is ZH-L16C GF not ZH-L16C GF? When it is a G2 Tek computer

    My posts are written with the ass-umption that when I turn my conservatism knob to 95 and get the longer bottom time as a result, that is because I actually plan to stay at the bottom longer. You are of course welcome to set your computer up the way you read on The Internet and then ignore it...
  17. dmaziuk

    When is ZH-L16C GF not ZH-L16C GF? When it is a G2 Tek computer

    There was a context to the post Stuart commented on, which he ignored as usual. The context was the computer "adaptively" changing your chosen conservatism setting (GF in this case) mid-dive without you asking. There is nothing theoretical about that being a bad idea, whichever way it changes...
  18. dmaziuk

    When is ZH-L16C GF not ZH-L16C GF? When it is a G2 Tek computer

    :rofl3: :rofl3: :rofl3: OK, I officially need a day off. I did of course mean "more" when I typed "less", and it took me three -- count 'em -- re-reads to see that. :facepalm:
  19. dmaziuk

    When is ZH-L16C GF not ZH-L16C GF? When it is a G2 Tek computer

    (With thanks to @scubadada) yes: if you cut your dive short early enough, when you are still on-gassing, you can indeed surface with less gas loading than originally planned. So that statement is indeed not universally true.
  20. dmaziuk

    When is ZH-L16C GF not ZH-L16C GF? When it is a G2 Tek computer

    Only if you don't ride your GF all the way to 85 and surface with 70 as originally planned. In which case: why did you you change it mid-dive, "because you can"? (*) *)
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