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.

From the home screen, scroll down to the extended app list.
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, the planned depth appears in red.
Press ENTER.
Select an option:
- To exit, select Done.
- To add intervals to your dive, select Add Repeat Dive, and follow the on-screen instructions.

Descent™ X30

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Calculating NDL Time