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Calculating Your Breathing Gas

You can calculate the PO2 value, oxygen percentage, or maximum depth for a dive by adjusting two of the three values. The calculations are affected by the water type setting in the Dive Setup menu (Dive Setup).

  1. From the home screen, scroll down to the extended app list.
  2. Select Plan Dive > Calculate Gas.
  3. Press PREV or NEXT, and select an option to calculate:

    • Select PO2.

    • Select O2%.

    • Select Depth.

  4. Press PREV or NEXT to edit the first value.
  5. Press ENTER, then press PREV or NEXT to edit the second value.

    As you edit the values, the device calculates an adjusted value for the highlighted option.

  6. If necessary, press BACK to calculate the value for a different option.
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September 2025
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