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Bailout setttings suggestion.

Discussion in 'Shearwater Research' started by KenGordon, Feb 19, 2017.

  1. KenGordon

    KenGordon Rebreather Pilot

    This is a not so easy suggestion...

    When diving CCR mode bailing out is an extreme event and a bailed out ascent ought to be rare. As such using different GF settings may be appropriate. Could there be two sets of settings? I realise this may lead to confusion so is not easy to implement cleanly. I am not prepared to change the GF manually once I have bailed out - expecting to do that in a real situation seems like wishful thinking.

    My current solution for this is to use two computers, one set to a reasonable GF for every day use and one set to 'better than drowning' to be used in the case of a bailout. This means I sometimes do not have room on my arm for a computer set to match my buddy. Also the bailout computer can only guess my ppo2.

    Another handy thing would be to be able to show the bailout time to surface.

    In the conditions I dive in you may or may not be able to do a last stop at 3m. For me I would like to see the time to surface assume a 6m last stop but alllow a 3m last stop when I get there. Again this could lead to user confusion so some cleverness in the settings would be required.
  2. JohnnyC

    JohnnyC PADI Pro

    # of Dives: I'm a Fish!
    Location: United States
    If doing a dive where the amount of bailout you are carrying is not enough to get you to the surface with a similar GF setting to what you plan on using to properly decompress, you need to carry more bailout. If that means you sling an 80 instead of a 40, so be it. No one ever died from carrying too much gas.

    The Shearwaters automatically switch TTS to reflect the gases carried in a bailout state, and it knows your PO2 because you've input your bailout gases. You can also set your last stop depth to 6m or 3m.

    This is the way both my SA and EXT Predators work. I can't imagine they've removed those features from more recent software iterations.
  3. rongoodman

    rongoodman ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Albany, NY
    You should look into the GF99 display. This is exactly the situation it is designed for.
    RainPilot likes this.
  4. KenGordon

    KenGordon Rebreather Pilot

    So you think I should follow the same ascent whether I have a fully working rebreather or have had a CO2 hit and am at risk of running out of gas? Since we can only guess at how much gas is required getting to the surface asap seems prudent. I suppose I could set the main computer super aggressive and pad the stops, but that starts to defeat the purpose of a computer.

    Yes, the OC ascent will reflect the gas I am breathing, but the backup computer has only a vague idea of what I was breathing up until I bailout.

    Setting the last stop depth to 3 gives me an unrealistic TTS as I am not going to do my last stop at 3, but I can probably go shallower than 6, especially if on a busy shot. It all depends on the weather.
  5. KenGordon

    KenGordon Rebreather Pilot

    Fair point. I have my backup set to display that. Maybe I should practice ascents using that.

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