Setting Up Your Breathing Gases

You can enter up to twelve gases for each gas dive mode. Decompression calculations include your decompression gases, but do not include your backup gases.

Select Dive Setup > Gases.
Select a dive mode.
Select the first gas in the list.

For single-gas or multi-gas dive modes, this is the bottom gas. For the closed-circuit rebreather (CCR) dive mode, this is the diluent gas.
Select Oxygen, and enter the oxygen percentage of the gas blend.
Select Helium, and enter the helium percentage of the gas blend.

The dive computer calculates the remaining percentage as the nitrogen content.
Press BACK.
Select an option:

NOTE: Not all options are available for all dive modes.
- Select Add Backup, and enter the oxygen and helium percentage for your backup gas.
- Select Add New, enter the oxygen and helium percentage, and select Mode to set the intended use for the gas, such as decompression or backup.
  
  NOTE: For the multi-gas dive mode, you can select Set as Travel Gas to set your intended gas for descending.

DESCENT™ X50i

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Setting Up Your Breathing Gases