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A1 USER MANUAL
level. The display will show the new active
MB level. You can set your A1 to warn you
when this happens.
4.4.14 Ascent rate alarm
The A1 employs a variable ideal ascent
rate. Its value ranges from 3 to 10m/min
(10 to 33ft/min) and the actual breakdown
by depth range is listed in the table below.
DEPTH ASC SPEED
m ft m/min ft/min
0 0 3 10
2.5 8 5.5 18
6 20 7 23
12 40 7.7 25
18 60 8.2 27
23 75 8.6 28
31 101 8.9 29
35 115 9.1 30
39 128 9.4 31
44 144 9.6 32
50 164 9.8 32
120 394 10 33
If you ascend too quickly, the resulting
pressure reduction could lead to
microbubble formation. If you ascend too
slowly, the continued exposure to high
ambient pressure means you will continue
loading some or all of your tissues with
nitrogen.
If the ascent rate is greater than 110% of
the ideal value, the SLOW DOWN alarm is
shown.
4.4.15 SOS
If you stay above a depth of 0.8m/3ft for
more than 3 minutes without observing a
mandatory decompression stop, the A1 will
switch into SOS mode. Once in SOS mode
the A1 will lock up and will be inoperable as
a dive computer for 24 hours. If it is used
for diving within the 24 hours of an SOS
lock, it will automatically switch to gauge
mode and provide no decompression
information.
SOS in Gauge mode
SOS in Scuba mode
WARNING
Violating a mandatory decompression
obligation may result in serious injury or
fatal issue. Serious injury or fatal issue may
result if a diver does not seek immediate
treatment should any signs or symptoms of
decompression sickness occur after a dive.
Do not dive to treat symptoms of decompression
sickness.
Do not dive when the computer is in SOS
mode.
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