SUUNTO DX - Manual (Page 51)

5.7. Accessing DIVE mode
The Suunto DX has four diving modes: AIR mode for diving with standard air only,
MIXED mode for diving with oxygen and/or helium mixtures, CCR for rebreather diving,
and GAUGE mode for use as a bottom timer.
The chosen dive mode is displayed when the DIVE mode is accessed, and you can
toggle between the submodes by pressing the UP/DOWN buttons.
PRESS MODE TO ENTER
THE DIVE MODE SELECTION,
THEN QUICKLY TOGGLE
THROUGH THE SUBMODES
BY PRESSING UP BUTTON.
5.8. DIVE mode settings
Suunto DX has several user-definable functions, as well as depth and time-related
alarms that you can set according to your personal preferences. The DIVE mode
settings are dependent on the dive submode chosen (AIR, MIXED, CCR, GAUGE),
so that, for example, Set point settings are only available in the CCR submode.
The table below shows what DIVE settings are available in each DIVE submode.
52