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What computers are you using for tech dives?

Discussion in 'Technical Diving Specialties' started by Cyborg Pirate, Aug 27, 2017.

  1. JohnnyC

    JohnnyC Divemaster

    # of Dives: 0 - 24
    Location: United States

    Did Suunto relocate to Guyana?
    kensuf and RyanT like this.
  2. elgoog

    elgoog DIR Practitioner

    # of Dives: 200 - 499
    Location: San Francisco Bay area
    Can we have your Sea Spanners?
    PfcAJ and JohnnyC like this.
  3. boulderjohn

    boulderjohn Technical Instructor ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Boulder, CO
    My buddy and I made that exact switch earlier today. I will let him know tomorrow how close we came to death. Of course, the problem will be that we will be planning the same switch later on in the day. Will we have the nerve now that we know the truth?
  4. MargaritaMike

    MargaritaMike Divemaster

    # of Dives: 1,000 - 2,499
    Location: On a non-divable lake in SE Texas
    I don't smoke and I don't think I have a PFO. Should I be using a Suunto instead of my Perdix?

    Cheers - M²
    100days-a-year likes this.
  5. PfcAJ

    PfcAJ Orca

    # of Dives: 5,000 - ∞
    Location: St Petersburg, Fl
    Well the suunto will be a more accurate representation of what’s happening in your body and will stop you from making suicidal mistakes. So I say make the switch.

    Suunto reps have unparalleled knowledge when it comes to all things decompression.
    kensuf likes this.
  6. 100days-a-year

    100days-a-year Solo Diver

    # of Dives: 5,000 - ∞
    Location: NE Florida
    I heard the Suuntos will actually give audible warnings,for example.
    "You are ascending too fast"
    "You should stop smoking "
    "You are to old to do this anymore"
    "You are a fata$$"

    And if you really push it

    "You have exceeded Suunto's theoretical ICD threshold "
    Swan007 likes this.
  7. Brandon

    Brandon Shop Independent Diver ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Alaska
  8. MargaritaMike

    MargaritaMike Divemaster

    # of Dives: 1,000 - 2,499
    Location: On a non-divable lake in SE Texas
    I am old and fat. It looks like the Suunto was made for me except that I don't smoke. As far as ascending too fast I try to watch the little arrows on my Perdix. :):)

    Cheers - M²
    100days-a-year likes this.
  9. Tom Ahola

    Tom Ahola Angel Fish

    How funny that one word, perhaps wrongly chosen by me, not being natively English speaking, stirs up so much emotions. I should have used a less strong word than suicidal for people wanting to live on the edge, but could not think of one at that moment. I have seen so many divers dying just because of ignorance and narrowmindedness that somehow this word was at the top of my mind. Sorry about that.

    But yes, the ICD. Bruce Wienke has said that ICD is ignored by many divers. It seems to be another very religious topic, just as the algorithm. I dislike getting involved in religious discussions but I wanted to explain why the algorithm works as it works with those gases. My colleagues stay far away from these discussions but myself I like to have an open discussion, sharing information. After getting this kind of feedback and accusations only because of one wrong chosen word, I do consider is it worth the spending time here. Then again, I should not let a minority of complainers ruin the conversation and information sharing.

    The problems that ICD causes in the body has been observed in divers (Lambertsen and Idicula) and laboratory experiments have been made (Strauss and Kunkle) demonstrating the bubble formations it causes. Based on numerous research papers on the topic, Bruce Wienke has implemented measures in the RGBM algorithm that takes into account ICD. Those tec divers I know use proper gas switches and avoid ICD hits and the decompression penalty the RGBM gives as a safety measure.

    I have no information at hand about casualties or DCS caused by ICD. There certainly are DCS cases at least **1). I haven't got time to dig for more references now. Anyway, myself I prefer to prevent mishaps before they happen, not afterwards.

    Here is one article about ICD for your interest: Isobaric Counterdiffusion • ADVANCED DIVER MAGAZINE • By Bruce Wienke

    Happy diving,
    Tom from Suunto

    **1) Rostain, JC; Lemaire, C; Gardette-Chauffour, MC; Naquet, R (1987). Bove; Bachrach; Greenbaum, eds. "Effect of the shift from hydrogen-helium-oxygen mixture to helium oxygen mixture during a 450 msw dive". Underwater and hyperbaric physiology IX. Bethesda, MD, USA: Undersea and Hyperbaric Medical Society.
  10. kensuf

    kensuf Cave Instructor

    Bruce Weinke is a loon.

    There, I said it.

    Let's look at something real quick.

    PN2 of 50% nitrox at 70': 1.6
    PN2 of 18/45 at 70': 1.2
    PHe of 18/45 at 70': 1.4

    Going from 18/45 to 50% your change in PHe is 1.4->0. Going from 18/45 to 50% your change in PN2 is 1.2->1.6. The delta isn't enough to be a concern.

    People do a switch like this every day without problems.

    BTW, I find it hysterical that you're quoting an article by Weinke that talks about Mark Ellyiat and his success using RGBM schedules. You may wish to read what Mr. Ellyiat has to say about Weinke and RGBM his own web-page.

    RGBM Really Good Bends Model

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