Operating Instructions
Page 23
Doc. 15301-RevB (2023-11-24)
A Test Alerts tool is also available
in the Dive Tools menu and should
be used regularly before diving to
ensure the vibrator is functioning
properly�
Persistent Alerts
When the computer detects a dangerous situation,
such as high PPO2, a warning is triggered� The large
primary warning can be dismissed, but the alert
indicator will persist until the condition that caused the
warning is resolved�
Pressing the menu button while the
alert icon is present will display the
warnings overlay which lists all of
the current persistent alerts in order
of priority�
Pressing the menu button a second
time brings up the main menu as
normal�
Vibration Alerts
In addition to visual notifications, the Tern has vibration
alerts to help quickly notify the diver of warnings,
errors and dive events�
If turned on, attention vibration alerts occur when
a safety stop starts, pauses, or is completed�
Vibration alerts will also occur any time a primary
notification is triggered and every 10 seconds until it is
acknowledged�
The alert notifications settings can
be changed in Main menu > Alerts�
It’s important the diver is aware of
what type of alert notification they
can expect on a dive� The currently
selected alert notifications are
shown on:
• The owners information screen
• The surface screen
Limitations Of Alerts
All alarm systems share common weaknesses�
They can alarm when no error condition exists
(false positive)� Or they can fail to alarm when
a real error condition occurs (false negative)�
So respond to these alarms if you see
them, but NEVER depend on them� Your
judgment, education, and experience are
your best defenses� Have a plan for failures,
build experience slowly, and dive within your
experience�
m
38
.
3
O2/He
21/00
PPO2
.21
23
19
:
TTS
!
WARNINGS
•HIGH PPO2
•MISSED STOP
P
S
I
DECO
20 2 14
T1
1850
O2/He
21/00
ft min
TTS
ft
mh
342
SURFACE
OC
Nx
SURFACE
NDL TTS
----
FD
Alerts
.
0
✘
Silent Mode
Vibrate
ft
125
.
6
23
19
:
DECO
20 214
T1O2/He
21/00
ft
TTS
VIB. = ON
2 Long
ALERTS
If you do not like vibrating alerts,
they are easily silenced�
Caution
Although vibration alerts are very useful,
never rely on them for your safety�
Electromechanical devices can and will
eventually fail�
Always be proactively aware of your depth,
no-decompression limit, gas supply, and
other critical dive data� You are ultimately
responsible for your own safety�
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