Operating Instructions
Page 12
Doc. 15301-RevB (2023-11-24)
Safety Stop Counter
The safety stop counter replaces NDL
and counts down automatically when
the diver ascends into safety stop range�
The counter will display “CLEAR” when
the safety stop has been completed�
Safety stops may be turned off, set to
fixed times of 3, 4, or 5 minutes, set to
adapt based on dive conditions, or be
set to count up from zero�
Count-up
When decompression diving, the
safety stop will begin once all
decompression obligation has been
cleared�
See the Safety Stops section on page
24 for details�
Maximum Depth
The maximum depth of the current
dive� When not diving, displays the
maximum depth of the last dive�
The right deco row box can be customized in every
dive mode� See Home Screen Customization on page
20 for details�
The Deco Row
The Deco Row is only shown in the Standard layout,
however, the Deco row information described in this
section is shown on the first page of the info row in
the Big layout�
No Decompression Limit (NDL)
Deco Stop Depth and Time
Once Mandatory decompression is required, NDL will
be replaced by decompression information�
By default the Tern uses a 3m (10ft) last deco stop
depth� When in decompression, you may perform
your last deco stop deeper if you wish - deco
calculations will remain accurate� If you choose to do
this, depending on your breathing gas, the predicted
time-to-surface may be shorter than the actual TTS
since off-gassing may occur slower than the algorithm
expects� There is also an option to set the last stop to
6m (20ft)� This does not affect no-deco safety stops�
See the Decompression Stops section on page 25
for details�
The time remaining, in minutes, at the
current depth until decompression stops
will be necessary�
Displays in Yellow when the NDL is less
than or equal to 5 minutes�
The shallowest depth to which you
can ascend and how long to hold
that stop�
m
m
.0
0
ft
STOPWATCH
SURFACE
Deep
19:16
FD
CLEAR
SAFETY
Important!
All decompression information including
Deco Stops, NDL, and Time to surface are
predictions that assume:
• Ascent rate of 10mpm / 33fpm
• Decompression stops will be followed
• All programmed gases will be used as
appropriate
Read more about Decompression and
Gradient Factors on page 26�
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