User manual

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.
1 Hold MENU.
2 Select Dive Setup > Gases.
3 Select a dive mode.
4 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.
5 Select Oxygen, and enter the oxygen percentage of the gas blend.
6 Select Helium, and enter the helium percentage of the gas blend.
The device calculates the remaining percentage as the nitrogen content.
7 Press BACK.
8 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 a decompression gas as your
intended gas for descending.
Setting PO2 Thresholds
You can configure the partial pressure of oxygen (PO2) thresholds, in bars, for decompression, warning, and
critical alerts.
1 Hold MENU.
2 Select Dive Setup > PO2.
3 Select an option:
• Select Deco PO2 to set the threshold that you can reach before you should begin your ascent and switch
to the decompression gas with the highest percentage of oxygen.
NOTE: The device does not switch gases for you automatically. You must select the gas.
• Select PO2 Warning to set the threshold for the highest oxygen concentration level that you are
comfortable reaching.
• Select PO2 Critical to set the threshold for the maximum oxygen concentration level that you should
reach.
4 Enter a value.
If you reach a threshold value during a dive, the device displays an alert message.
Diving 9