SUUNTO EON STEEL - Manual (Page 39)

NOTE: You can customize what you see in the Gas(es) menu. See
3.9 Customization.
It is important to understand how the Gas(es) menu works on
Trimix mode, where you can make use of multiple gases. In the
example below, the menu has three gases and tx18/45 is selected as
the active gas. Even though only one gas is active, the
decompression algorithm calculates ascent time (during dive) using
all these three gases.
To select another active gas:
1. While in the Gas(es) menu, press the middle button to see gas
options.
2. Scroll with upper or lower buttons to highlight Select.
3. Press the middle button again to confirm.
If you are diving with only one gas, ensure you have only that one
gas in the Gas(es) menu. Otherwise, Suunto EON Steel expects you
to use all gases in the list and notifies you to change gases during
the dive.
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