How to Calculate Time in a Dive Log Book

Becoming certified to scuba dive takes some academic and athletic effort, but adventure waits for those who complete the certification courses. One of the most important things learned is how to calculate dive logs. The longer a person spends underwater, the more nitrogen builds up in her, possibly presenting a life-threatening situation.

Things You'll Need

  • Pen
  • Paper
  • Calculator
  • Recreational dive planner
Show More

Instructions

  1. Determine Depth of Dive for Bottom Time

    • 1
      Never dive to depths beyond your training limits.

      Identify how deep you plan to dive, making sure you stay within the limits of your training (60 to 120 feet). Locate this depth on the dive table. Follow the table to determine your maximum bottom time and pressure group.

    • 2
      Required surface intervals prevent potentially life-threatening episodes underwater.

      Identify the mandated interval between dives with the pressure group received in step 1.

    • 3

      Use your pressure group (from dive 1) and interval to identify the maximum depth and bottom time for your second dive, and so forth.