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Wisdom of trusting one's dive computer?

Discussion in 'Basic Scuba Discussions' started by CaveSloth, Nov 12, 2019.

  1. Fastmarc

    Fastmarc Just drifting along... ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Kingston, Jamaica
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    It has me puzzled. I have been diving it for a while, but most of my recent dives has included more inexperienced divers that limit the dives due to poorer air consumption, so it wasn't noticeably. Having reconnected with some old buddies and doing more enjoyable longer dives with them, it just became more obvious.
     
  2. Lorenzoid

    Lorenzoid idling in neutral buoyancy

    # of Dives: I just don't log dives
    Location: Atlanta, USA
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    Asking out of curiosity, but by any chance is the buddy someone who is new-ish to the GUE system? I ask because in Fundies class GUE teaches you to pre-plan and then dive with the computer in gauge mode. They teach that because, as others have already mentioned, they want to wean you off the idea of "flying the NDL"--letting the ever-changing number on the screen dictate when you turn your dive. The strict use of gauge mode is more of a training tool than anything else. From what I have seen, there are some really experienced GUE-trained divers who keep their minds open to their computers' full capabilities--they just don't let the numbers on the screen override what they have already planned. Rather, the computer backs up or complements what they planned.

    Planning shouldn't be onerous. A computer's planning mode can be used to pre-plan a dive. In advance of the dive, you should have at least a rough idea what you would like to see and the route to get there and back--it's not a great idea to go willy-nilly from one place to another and another on a whim, especially if these are cavern dives you're talking about. You should have at least a rough idea how deep the route and destination are. Based on the depth, you can go into your computer's planning mode and see how many minutes you can spend at that depth, or the average depth if you prefer. If you know that time limit in advance and plan to adhere to it rather than "fly the displayed NDL," there really isn't much point to restricting your computer to gauge mode on the dive.
     
    wstorms, KWS and CaveSloth like this.
  3. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: U.S. East Coast
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    Why would you want to do something incorrect like this? I understand its value for air consumption, but it is not correct for nitrogen uptake.
     
  4. Lorenzoid

    Lorenzoid idling in neutral buoyancy

    # of Dives: I just don't log dives
    Location: Atlanta, USA
    9,070
    5,581
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    You're right. Brain fart.
     
    CaveSloth likes this.
  5. ChuckP

    ChuckP Manta Ray

    # of Dives: 200 - 499
    Location: Cozumel
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    I dive 45/85 and routinely dive small deco amount dives - something along the lines of allowing myself to get 10-15 minutes of deco (TTS 15min max). These are at rec depths with a source of some deco gas. My first stop has never been deeper than 20' per the computer.

    With that being said and those type dive profiles - diving 85/85 or 45/85 is no different.

    The dives I do are recreational dives, I'm right there with everyone else in the group other than I may stay a bit deeper longer than the others - it would be exactly like someone that accidently allowed themselves to slip past the NDL.
     
    KWS and FreeFlyFreak like this.
  6. PfcAJ

    PfcAJ Orca

    # of Dives: 5,000 - ∞
    Location: St Petersburg, Fl
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    Its very close in practice.
     
  7. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: U.S. East Coast
    8,057
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    A pure guess can be close, too. :)
     
  8. PfcAJ

    PfcAJ Orca

    # of Dives: 5,000 - ∞
    Location: St Petersburg, Fl
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    Except in this case, it isn’t a guess :)

    fiddle with it using some deco software and see for yourself.
     
  9. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: SE TEXAS
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    The only reason to not use teh puter that I can see is in a deco asccent where say ratio deco is used instead of teh puter and you end up locking up the puter for a missed stop. Again that is deco diving and not the rec environment.
     
  10. seeker242

    seeker242 DIR Practitioner

    # of Dives: 200 - 499
    Location: Pompano Beach, FL
    1,168
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    Plenty of GUE divers use the NDL on the computer, but they don't, or they're not trained, to rely on it exclusively. Every dive is planned as well as it can be regardless.
     

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