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Nitrox course. What's the point?

Discussion in 'New Divers and Those Considering Diving' started by Dody, Jan 9, 2021.

  1. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

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    To what are you referring, laser range-finders?
     
  2. doctormike

    doctormike ScubaBoard Supporter Staff Member ScubaBoard Supporter

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    I agree with you that any diver would benefit from what we Yanks call "technical training". That was actually one of my first posts in this thread. Even if you never go into deco, it's about the mindset - planning, not just swimming around until the DM tells you to go up.

    On the other hand, I wouldn't agree that it's not safe to dive with just OW training. I mean, there is risk in all diving, but the vast majority of certified divers never go beyond OW, and the overall safety record of diving is pretty good. A good OW instructor can certainly give his or her students the skills that they need to be safe divers within their limits.
     
  3. doctormike

    doctormike ScubaBoard Supporter Staff Member ScubaBoard Supporter

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    Screen Shot 2021-01-16 at 6.26.17 PM.png
     
  4. Angelo Farina

    Angelo Farina Marine Scientist

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    Ok, but let's go back on topic.
    Nitrox.
    Please tell me what of the two following options is safer:
    1) Dive 30 min at 30m with air tables, so you are beyond NDL and you need to make a mandatory deco stop of 3m at 3 meters. Of course you must be deco-trained and deco-equipped.
    2) As there is Nitrox-32 in your tank, a 30m/30 min dive is considered within NDL, so an unskilled basic OW diver can do it without any additional precaution.
    For me, 1) is safer than 2).
    And for you?
     
  5. Centrals

    Centrals Barangay Pasaway

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    I did my nitrox course back in 1997. Why? Why not!
    Is it useful? Yes and No.
    Extend the bottom time? Yes and No as long as you can last the pace. The deciding factor is the amount of gas available.
    How often I used it? For a reef dive there is not much point because I can always move up(multi-level) to shallow.
    Nowadays I only use it for square profile wreck dive and it is quite rare to find wreck sitting around 25m. Too deep or shallow then I will use Nitrox 21.

    It is an option if one is interested.
     
  6. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

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  7. lermontov

    lermontov Manta Ray

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    ha that was 5 tangents ago - keep up man!
     
  8. doctormike

    doctormike ScubaBoard Supporter Staff Member ScubaBoard Supporter

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    You must be new here.

    Well, saying which is safer (from a DCS) point of view can be considered in different ways. With #2, no matter what happens, you can ascend directly to the surface, where that is not an option in one. Of course, you said "deco-equipped" which to me means a redundant gas supply if you are doing back gas deco, so I guess you have an option in #1 that you don't have in #2.

    And of course, you are asking me to compare decompression stress from two different profiles with two different gasses. It's such an inexact science with so many physiological variables, it's hard to say. But if I had to do this as a back of the envelope calculation, your surfacing GF Hi would be a good way to compare them. If they were the same with #1 and #2, that might mean that they were similar risks. I'm not a decompression expert, so I can't be more accurate than that.
     
  9. MichaelMc

    MichaelMc Working toward Cenotes ScubaBoard Supporter

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    As a scientist, you are really only supposed to vary one thing at a time. You seem to be varying two or more.
    1) air, air tables, deco trained, deco-equipped, not in NDL
    2) nitrox, nitrox tables, unskilled, in NDL
    Would you care to simplify it to changing only one variable of interest?

    Or is your point just more training and a broader skill set is better. And maybe extra gas and redundant gas.
     
  10. lermontov

    lermontov Manta Ray

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    Nice clarity - good post
     
    ToneNQ likes this.

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