Page 23
Doc. 13300-REC-RevB (2022-05-02)
Recreational Modes
Operating Instructions
3.9. Customizable Alerts
In addition to automatic warnings indicating
potentially dangerous situations, the Petrel 3 has
customizable alerts for maximum depth, maximum
dive time, and minimum no-decompression limit�
See on Alerts Setup on page 57 for details on how
to modify these alerts�
Depth Alert
By default the depth alert is
set to 40 meters�
In addition to the Primary
notification which can be
dismissed, the depth value
will turn yellow when deeper
than the Alert value�
The depth alert will reset if the depth goes 2m
shallower than the alert depth�
Time Alert
By default the dive time alert
is set to 60 minutes, but is
turned off�
In addition to the Primary
notification which can be
dismissed, the dive time value
will turn yellow when greater
than the Alert value�
The time alert will only fire once per dive�
Low NDL Alert
By default the low NDL alert
is set to 5 minutes�
In addition to the Primary
notification which can be
dismissed, the NDL value will
turn yellow when at or below
the Alert value�
The NDL alert will reset if the NDL goes above the
NDL alert value by 3 minutes�
Example: If NDL Alert value is 5 minutes, The NDL
Alert will reset once NDL reaches 8 minutes�
:
m
40
TIME
:1
.
5
8
:
10
5 00
:
11
Depth Alert
Alert
Confirm
:
m
21
TIME
:1
.
5
8
:
60
5 00
:
11
Time Alert
Alert
Confirm
:
m
33
TIME
:1
.
5
5
:
22
5 00
:
11
Low NDL Alert
Alert
Confirm
Limitations of Alarms
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)�
Respond to 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�
