SUUNTO HELO2 - Manual (Page 48)

5.9.1. Accessing DIVE mode
The Suunto HelO2 has two diving modes: MIXED GAS mode for diving with gas mixes
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.
5.9.2. DIVE mode activation
The dive computer activates automatically when submerged deeper than 0.5 m/1.5
ft. However, it is necessary to activate the DIVE mode BEFORE diving to check
the altitude and personal adjustment settings, battery condition, oxygen settings,
and so on.
After activation, all graphical display elements are turned ON, and the backlight and
the beep are activated. A few seconds later the battery power indicator is shown.
48