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Insta-buddy DECO Diver: What’s NDL?

Discussion in 'Near Misses and Lessons Learned' started by Soloist, May 26, 2019.

  1. Frosty

    Frosty Divemaster

    # of Dives: 500 - 999
    Location: Auckland NZ
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    Bob--that's darn scarey. If you don't teach tables then how can they understand the whole point of the computers? To me its hand in hand. Tables then explaining what the computer does for you.
     
    Soloist likes this.
  2. Bob DBF

    Bob DBF Solo Diver

    # of Dives: I just don't log dives
    Location: NorCal
    7,999
    10,760
    113
    One doesn't need tables or computer to teach or understand decompression. However when time constrained and needing to explain the user operation of a computer, possibly a few, I can see skipping theory over operation.

    With tables everyone is on the same page and there is an actual line one can see between NDL and deco. And to make the tables operate properly there is a lot of practice, exactly the way you will in real life.


    Bob
     
    Dan G likes this.
  3. Soloist

    Soloist Solo Diver

    # of Dives: 500 - 999
    Location: North Carolina
    899
    1,264
    93
    We purchased complete kits after becoming OW certified (and continue to add more and more and more), so we have never rented gear. This leads me to a couple of questions.

    Do dive ops typically provide a quick tutorial on the dive computers they rent? Considering the differences between manufacturers, models, displays and modes it would seem pragmatic.

    If diving 4 to 5 dives a day over the span of a week (excluding liveaboards) does the dive op verify each diver receives the same computer each day?
     
  4. Duglum

    Duglum Nassau Grouper

    # of Dives: 200 - 499
    Location: Munich, Germany
    72
    27
    18
    I'll never get people's fear of deco... i actually very much prefer a few minutes of light real deco followed by a very slow ascent over the typical "near-zero-NDL, then safety, then plop up instantly from 5m". I use 50/75 on my OSTC and went into deco on several dives on a recent trip.. only got big eyes from some of the other divers.. including people with a few hundred dives.
    Sometimes i really wonder why there are not more accidents with this amount of clueless divers...
     
  5. Storker

    Storker ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: close to a Hell which occasionally freezes over
    14,831
    11,295
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    Well, some of those prefer to stay off the slippery slope. Deco is a hard black line drawn through a fuzzy grey continuum, but you have to stick with some standards.

    My standard is whatever my RDP and my computer is telling me, and since I don't trust that I have the proper gear nor the necessary skills to solve any problem underwater instead of just heading for that unlimited gas supply, I choose to stay out of deco (whatever that might be, but again you have to choose some kind of hard limit despite the fuzziness of the real world)
     
    RyanT and Bob DBF like this.
  6. Bob DBF

    Bob DBF Solo Diver

    # of Dives: I just don't log dives
    Location: NorCal
    7,999
    10,760
    113
    May be the fear had more to do with the fact that some dive op's check computers for deco, and if deco found, its out of the water for the diver the rest of the day. Secondly, they may not believe in exceeding the limits of their training, and assume you are exceeding yours.

    I don't fear deco, but have a healthy respect for it. I did most of my deco decades ago, and my rule was, and is, no deco without redundant gas. I rarely carry redundant gas so...


    So do I, but for many other reasons other than them wanting to avoid deco.


    Bob
     
    Storker likes this.
  7. rabe

    rabe Manta Ray

    # of Dives: 200 - 499
    Location: Brisbane
    556
    273
    63
    For what I've seen so far here in Australia, yes.
     
  8. Altamira

    Altamira ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Canyon Lake, TX
    1,826
    1,746
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    I have been on a lot of cruise ship dives (100+ in the past 9 years), and very few of them had the second dive deeper than the first. Exceptions being times when the dive op was obviously scoping out their dive clients and buddy pairs on the first dive, and then possibly adjusting the dive profile for selected divers, or swapping dive buddies for the second dive. For example, on a two tank dive in Fr. Polynesia, the entire group (a mix of OW and AOW divers) dove to @60' on the first dive. On the second dive, some of us experienced OW divers were moved to the AOW group, and dove to @100' after a very long SI, and some of the AOW who I saw having issues on the first dive were moved to the OW group for a shallow second dive.
     
  9. Dan G

    Dan G Manta Ray

    # of Dives: 200 - 499
    Location: Colorado
    1,096
    768
    113
    A computer such as the Shearwater, displays "time to surface," so the 'light deco' you refer to is more predictable. I have not seen a rec computer display TTS so deco is unpredictable unless planned with redundant gas.
     
  10. Snoweman

    Snoweman Loggerhead Turtle

    # of Dives: 50 - 99
    Location: Atlanta, GA
    2,877
    2,010
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    I signed up myself and three buddies for an AOW class. I got all the information of what each of us needed for rental gear. Two folks needed computers. On our last dive of our class, the instructor brings up about needing to pay attention to the computer. One in our group says, "I don't have one." What the hell did he do for the other dives, because I KNOW he didn't have dive tables with him? I was actually a little pissed that the instructor passed him for the class, because of the question, and he is a crappy diver.
     
    Soloist likes this.

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