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Air Integration & NDL Accuracy?

Discussion in 'Shearwater Research' started by CaveSloth, Nov 12, 2019.

  1. tridacna

    tridacna ScubaBoard Supporter ScubaBoard Supporter

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    Maybe. Maybe not. Top secret. Marketing says yes. I’d like to see the algorithmic evidence. Apparently skin temp is factored in too. Maybe not. Proprietary stuff.
     
    rhwestfall and FreeFlyFreak like this.
  2. ChuckP

    ChuckP Manta Ray

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    You haven't had one of those heart rate monitors that doesn't work?? Lucky you :)

    The Scubapro says it factors heart rate in, didn't know about body temp but makes sense with what they are trying to do. How much is the factor is a SWAG. You can turn that setting on and off though.
     
  3. CaveSloth

    CaveSloth Barracuda

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    That is cool and is an advantage they have over Shearwater computers if it is true.

    This article mentions exercise level as a factor which can affect ongassing:

    Alert Diver | Gradient Factors
     
  4. FreeFlyFreak

    FreeFlyFreak Solo Diver

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    Advantage.......
    Hmmm...
    So..

    A) You have to wear a heart rate monitor under your wet/dry suit
    B) The RGBM model they use is then modified, somehow, depending on the heart rate.
    C) How is the algorithm modified?
    D) Has there been any research validating the amount of modification?
    E) You can no longer plan your deco time in advance as it is modified on the fly somehow depending on your heart rate.

    Advantage?
    Or marketing fluff?
     
  5. JohnnyC

    JohnnyC Divemaster

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    Marketing wank is never an "advantage."
     
    JohnN, markmud, rhwestfall and 2 others like this.
  6. Esprise Me

    Esprise Me Kelp forest dweller ScubaBoard Supporter

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    Seems one could test whether the NDL varies with heart rate, if one had two identical Scubapro computers. Put one on each wrist, turn the function off on one, and do a dive with some hard finning or whatever, then compare remaining NDL from each. Whether the adjusted number bears any relationship to reality would be harder to test, of course.
     
  7. JohnnyC

    JohnnyC Divemaster

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    I have no doubt that they may implement some sort of code that would change the NDL based on heart rate. However, considering the....fluidity of decompression, this sounds like they're measuring with a single particle detector, marking their line with the un-gassed remnants of a can of krylon marking paint, and then turning an ADHD beaver sans Adderall loose on it.

    It doesn't matter if you have the ability to fill a 5 gallon with a highly precise number of Dimetapp cup fulls, or you use the garden hose, a full bucket is a full bucket, and the precision required is irrelevant.

    Is more accurate (if it even is accurate) important enough to step down in other features compared to the competition? Well, when people get bent well within the NDL's, and people blow of 20 minutes of deco with no ill effects, it doesn't really seem like it.
     
  8. doctormike

    doctormike ScubaBoard Supporter Staff Member ScubaBoard Supporter

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    Some tourists at the Museum of Natural History are looking at a dinosaur skeleton. One of them asks a guard, "Can you tell me how old those bones are?"

    The guard replies, "They are 65,000,003 years old."

    "That's an awfully exact number," says the tourist. "How do you know their age so precisely?"

    The guard says, "Well, when I started working here three years ago they told me that they were 65 million years old."
     
    JohnN, Steve_C, RayfromTX and 12 others like this.
  9. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

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    Great! Consider it stolen!
     
    doctormike likes this.
  10. rhwestfall

    rhwestfall Solo Diver

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    Yes bet there isn't really enough science behind it (not that what we are doing now is pure science.....)
     
    markmud likes this.

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