Dive Planning

You can plan for future dives using your dive computer, such as calculating your breathing gas or no-decompression limit (NDL) times.

Calculating NDL Time

You can calculate the no-decompression limit (NDL) time or maximum depth for a future dive. These calculations are not saved or applied to your next dive.

Press .
Select Plan Dive > Compute NDL.
Select an option:
- To calculate NDL based on your current tissue load, select Diving Now.
- To calculate NDL based on your tissue load at a future time, select Enter Surf. Interval, and enter your surface interval time.
Enter an oxygen percentage.
Select an option:
- To calculate the NDL time, select Enter Depth, and enter the planned depth for your dive.
- To calculate the maximum depth, select Enter Time, and enter your planned dive time.
The NDL countdown clock, depth, and maximum operating depth (MOD) appear.

NOTE: If the planned depth exceeds the MOD of the dive computer or the breathing gas, a warning message appears, and the gas MOD appears in red.
Press .
Select an option:
- To exit, select Done.
- To add intervals to your dive, select Add Repeat Dive, and follow the on-screen instructions.

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 settings (Dive Settings).

Press .
Select Plan Dive > Calculate Gas.
Press or , and select an option to calculate:
- Select PO2.
- Select O2%.
- Select Depth.
Press or to edit the first value.
Press , then press or to edit the second value.

As you edit the values, the device calculates an adjusted value for the highlighted option.
If necessary, press to calculate the value for a different option.

fēnix® 8 Series

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Dive Planning

Calculating NDL Time

Calculating Your Breathing Gas