Suunto D4 User Manual page 29

Table 5.1. Audible and visual alarm types
Alarm type
Short single beep
Three beeps with a three
second interval and activated
backlight
Continuous beeps and activ-
ated backlight
You are able to preset alarms before the dive for maximum depth, dive time and time.
See also Section 5.8. DIVE mode settings and Section 4.1. TIME mode settings.
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Dive computer is activated.
Dive computer automatically returns to the TIME mode.
No-decompression dive turns into a Decompression
Stop dive. An arrow pointing upwards and the blinking
ascent warning ASC TIME will appear.
Maximum allowed ascent rate, 10 m per min/33 ft per
min, is exceeded. Ascent rate bar graph blinks and
STOP warning appears.
Decompression ceiling depth is exceeded. An Error
warning (Er) and a downward pointing arrow appear.
You should immediately descend to, or below, the
ceiling. The instrument will otherwise enter a perman-
ent Error mode within three minutes, indicated by a
permanent Er symbol.
Alarm reason