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Wisdom of trusting one's dive computer?

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

  1. MegDiver792

    MegDiver792 Nassau Grouper

    # of Dives: 200 - 499
    Location: United States
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    The OPs got a teric, which supports Gradient factors. He can go super conservative and go 30/70, or bump it up abit.

    If it was a Suunto with RGBM, I'd say shitcan the thing and get a shearwater.

    Ratio Deco is for lemmings and luddites.
     
  2. scubadada

    scubadada Diver Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Philadelphia and Boynton Beach
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    30/70 is just incredibly conservative for no stop dives. Sometimes advice on SB is just wrong.
     
    FreeFlyFreak, ChuckP and tridacna like this.
  3. PfcAJ

    PfcAJ Orca

    # of Dives: 5,000 - ∞
    Location: St Petersburg, Fl
    7,551
    6,180
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    But how would you know it was bad if you didn’t have an understanding of your dive parameters beforehand?

    That’s the whole point GUE is trying to make. You need to know what to expect your computer to say before you look at it. Pay attention to your depth. Pay attention to your NDL times. Understand the relationship between depth and time. What’s your NDL for 70’? 80’? What’s your average depth. Does that depth make sense based on the dive brief or any info you gathered before the dive?

    I think it’s silly to put a computer like a Shearwater in gauge mode. But I also think it’s silly to “trust” it and use it as my only source of information.
     
    seeker242 and Lorenzoid like this.
  4. PfcAJ

    PfcAJ Orca

    # of Dives: 5,000 - ∞
    Location: St Petersburg, Fl
    7,551
    6,180
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    You must be a ratio deco expert.
     
    Ryan Mcshane, rjack321 and rongoodman like this.
  5. NCadiver

    NCadiver Dive Shop

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    You plan your dive and use the computer as a guide. Your computer can go to 300ft but can you on the same token if you watch GUI divers profile minute to minute they won't be following their plan. Plan your dive and use your computer to monitor your dive.
     
  6. CaveSloth

    CaveSloth Barracuda

    # of Dives: 50 - 99
    Location: The Deep South
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    From the Teric manual:

    For OC Rec mode the default conservatism setting is medium (40/85).
    For OC Tec and CC/BO modes where some decompression is presumed, the default is a more conservative 30/70.

    I've been running in Tec mode, which means I've been running shorter NDLs than it does in rec mode!

    What should I set this sucker to?
     
  7. FreeFlyFreak

    FreeFlyFreak Solo Diver

    # of Dives: 25 - 49
    Location: California
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    Set whatever you want, only you can decide that.

    I personally use 75/75 for cold water NDL dives, and 85/85 for warm water NDL dives.

    So I currently choose to go 25% below the M value when cold, and only a 15% safety margin when warm.
    That is after reading and watching just about everything I could on decompression and NDL diving deco stress.
     
  8. JohnN

    JohnN Solo Diver

    # of Dives: 200 - 499
    Location: Oar--eee---gun
    2,155
    886
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    Sorry my ignorance, but doesn't the first number of XX/YY only apply if you have a deco obligation?
     
  9. FreeFlyFreak

    FreeFlyFreak Solo Diver

    # of Dives: 25 - 49
    Location: California
    517
    685
    93
    Yes.
    But you have to set them both regardless, in case you have unplanned/unintentional deco.
    I just make them the same, I don't do deco at the moment intentionally or unintentionally
     
  10. JohnN

    JohnN Solo Diver

    # of Dives: 200 - 499
    Location: Oar--eee---gun
    2,155
    886
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    So you have unplanned deco (IMHO a bit like running out of gas) and you decide to spin the revolver cylinder again?
     

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