Suunto D9 User Manual page 38

You are able to preset alarms before the dive. The programmable alarms can be set
for maximum depth, dive time and time. See also Section 5.9. DIVE mode settings
and Section 4.1. TIME mode settings.
Table 5.2. Preset alarm types
Alarm type
Continuous beep series for 24 seconds
Maximum depth blinks as long as the current depth
value exceeds the preset value.
Continuous beep series for 24 seconds or until any
button is pressed.
Dive time blinks for one minute.
Current time is shown
Continuous beep series for 24 seconds or until any
button is pressed.
Current time blinks for one minute
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Alarm reason
Preset maximum depth is
reached.
Preset dive time is reached.
Preset alarm time is reached.