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How does your computer handle deep dives?

Discussion in 'Advanced Scuba' started by fisherdvm, Sep 23, 2018.

  1. fisherdvm

    fisherdvm Contributor

    # of Dives: 200 - 499
    Location:
    3,577
    47
    I have a mares puck. At a 130 ft wreck with surface about 100 most of the divers approached the ndl on nitrox 30 to 32. I have never been advised to take a third suggested stop by the puck - probably because I usually spent most of my time on previous dives at 100 ft, so half depth matches the stop. But the first was at about half depth - about 65 ft I believe for 1 min Second was at 50 ft for 3 min, ( or perhaps 1 min) as best I could recall, and the third at 20 ft for 3 min. I noted a group of aow students just doing the 50 min, and the 20 min. About the same duration. My memory was not great. But it seems like there is slight differences in how computers handled suggested stops? I will have to observe again next time on a deep dive.
     
  2. fisherdvm

    fisherdvm Contributor

    # of Dives: 200 - 499
    Location:
    3,577
    47
    Second, if someone own a puck pro, as the book is not clear at all, how does it handle mandatory deco stop? I read that it has only the minutes recommended, next to depth. The puck is very hard to read underwater. The fine prints next to the number is impossible for me to read, and the book is not much better in explaining. Assuming that I had exceeded the ndl by 3 min ... can you tell me roughly what mandatory deco stops it will make? Roughly how many? How long? And does it have a clear count down as in the recommended stops?
     
  3. DanielRJones

    DanielRJones Contributor

    # of Dives: 100 - 199
    Location: Uk
    251
    149
    Most conouters run different profiles.
    There is
    buhlman 16
    Buhlman 8
    Dsat
    Edy
    Ruduced bubble model
    And a few more custom profiles.

    All of these will calculate stops and bottom times differently. And also depending on your conservatism.
    I dive a backup that is the same as my wifes so that we can both run a dive on the same profile even though my main computer (petrel 2) may say i have no stops or extra stops.
     
  4. DanielRJones

    DanielRJones Contributor

    # of Dives: 100 - 199
    Location: Uk
    251
    149
    Puck pro runs a rgbm algorithm which is one of the more conservative around.
     
  5. DanielRJones

    DanielRJones Contributor

    # of Dives: 100 - 199
    Location: Uk
    251
    149
    You are also diving beyond ndl times with no backup computer or tables.
    I know you are only going just beyond but how do you know you have enough gas for a ooa and doing deco obligations. If you are diving past ndl you shoukd be trained and dive should be planned to the depth and time and stuck to
     
    DogDiver and soggybadger like this.
  6. fisherdvm

    fisherdvm Contributor

    # of Dives: 200 - 499
    Location:
    3,577
    47
    **** does happen. I do not do these dives without a 120, a 19 cf pony, and 2 mares puck pro and a third computer on the console. If it does, one need to know roughly what to expect. As I have said before, it is hard to read the fine prints on the puck, and the instruction book is very vague and the illustration lacking. Down load it once off their site, and you will see how confusing it is.
     
  7. fisherdvm

    fisherdvm Contributor

    # of Dives: 200 - 499
    Location:
    3,577
    47
    On this dive, I heard computers beeping all around me!
     
  8. fisherdvm

    fisherdvm Contributor

    # of Dives: 200 - 499
    Location:
    3,577
    47
    I still had half tank at the ndl limit. Enough for plenty of deco.
     
  9. fisherdvm

    fisherdvm Contributor

    # of Dives: 200 - 499
    Location:
    3,577
    47
    I think one can have all the certifications in the world, and knowledge. But if one does not know how to use your computer, it is worthless. The puck is a pain as you have only one button, and have to toggle between two screens to get the data you need. Fortunately I dive enough to remember it. But for the occasional diver - it is not a good choice.
     
  10. soggybadger

    soggybadger Contributor

    # of Dives: 50 - 99
    Location: United Kingdom
    341
    195
    As with all kit. If you don't know how to operate an item it becomes a waste of space and possibly a hazard. Can I ask why you purchased the puck? Was it recommended to you? Thanks.
     

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