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Multiple dives & average depth function

Discussion in 'Basic Scuba Discussions' started by watchmanjc, Aug 22, 2007.

  1. watchmanjc

    watchmanjc Photographer

    # of Dives: 50 - 99
    Location: Camarillo, Calif.
    129
    13
    18
    I do most of my diving from local boats, and never log more than 3 dives in a day as a rule.

    I do not have a computer, but my dive watch (Casio sea pathfinder) has an average depth function.

    When filling out my log, computing pressure groups on a square dive, using max depth obviously puts me at a disadvantage for multiple dives and nitrogen loading.

    Is it safe to compute this using the average depth measurement from the dive?

    What is the purpose of the average depth function?

    Thanks All

    Watchmanjc
     
  2. sharkattack

    sharkattack Instructor, Scuba

    # of Dives:
    Location: Oakley, Ca
    308
    0
    0
    I would only use max depth, not average. With that said, how do you feel at the end of your dive day? You might be exceeding limits according to tables and math but what does your body tell you. If all is well, your getting by. I myself would not exceed the tables other than doing Deco.
     
  3. sam1

    sam1 Nassau Grouper

    # of Dives: 200 - 499
    Location: Fort Lauderedale, FL and Cape Cod, MA
    138
    9
    0
    Average depth is useful (necessary) to compute your SAC (surface air consumption).
     
  4. do it easy

    do it easy Assistant Instructor

    # of Dives: 500 - 999
    Location: Chicagoland, USA
    5,023
    4
    0
    redacted- ooops, I actually read the question :D
     
  5. watchmanjc

    watchmanjc Photographer

    # of Dives: 50 - 99
    Location: Camarillo, Calif.
    129
    13
    18
    I've never had any ill effects to date. Local dives off the boats I take have rarely exceeded 65 ft. max depth. I guess a computer will be in my future.
     
  6. Blackwood

    Blackwood DIR Practitioner

    # of Dives: 500 - 999
    Location: Redondo Beach (SoCal, not Washington)
    5,537
    314
    0
    Depth averaging isn't as simple as "my average depth was 60 feet, so my NDL was 60 minutes."

    You can use averages to figure deco, but I suggest taking a class rather than trying to glean info from the internet.
     
  7. sharkattack

    sharkattack Instructor, Scuba

    # of Dives:
    Location: Oakley, Ca
    308
    0
    0

    Computers are not a bad thing:)
     

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