SUUNTO COBRA3 User Guide - Manual (Page 46)

5.8.2. 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. After this, the selected altitude and personal settings are dis-
played, as well as the RGBM and Deep Stop status. A few seconds later the battery
power indicator is shown.
At this time, perform your pre-checks, and ensure that:
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