A&D 2 Plus - Manual (Page 6)

EXCEEDING THE ALTITUDE LIMIT
The M2+ operates normally up to an altitude
of 13,123 ft. If the altitude limit is exceeded,
the M2+ will display "HI" along with all the
altitude sectors.
If you make a dive after exceeding the
altitude limit the computer will not show any
decompression information; it becomes no
more than a depth gauge and bottom timer.
Also, Pre-Dive Planning Mode cannot be
started, since decompression information is
not available.
Diving display when
altitude limit has been
exceeded
SUMMARY OF ATTENTION
MESSAGES AND ALARMS
The M2+ draws your attention to certain situations and warns you of
unsafe diving practices. Attention messages and alarms are always
visual and acoustical while underwater; they are only optical at the
surface except for the decompression alarm.
ATTENTION MESSAGES
Attention messages are given by symbols, letters, or flashing figures.
In addition, two short beeps can be heard, in intervals of 4 seconds,
End of no-stop time
To avoid making a decompression dive, a "0"
flashes during the last minute of no-stop time
to alert you to ascend to a shallower depth.
Also, two beeps are sounded.
Microbubble warning (Atn)
This message is displayed when the M2+
calculates that there is an excess of mi-
crobubbles in your body tissues. Do not dive
while this message is displayed. If you dive
while the message is displayed, no-stop times
will be reduced and decompression times will
be longer.
in two different frequencies. Attention messages
appear in the following situations:
Altitude dive
During a change to a higher altitude, the M2+
displays an altitude sector icon and the corre-
sponding adaptation time.
ALARMS
Alarms are communicated to you by symbols, letters, or
flashing icons. In addition, an acoustic warning sounds
during the duration of the alarm. An alarm occurs in the
following situations.
Fast ascent
Reduce your ascent rate
Missed decompression stop
Descend to the prescribed decompression
stop at once.
Low computer battery
While diving, "bAt' alternates with the
maximum depth display. During Surface
Mode or Ready Mode, "bAt" flashes in the
maximum depth position. This indicates
battery charge is nearing 0%.