Shearwater DiveCAN
®
Petrel
DocRevB
31
Dive Phase Description
Petrel Display
Decreasing
NDL
As we descend deeper, the NDL decreases�
The TTS shows it will take 5 minutes to ascend
to the surface at 10m/min (33ft/min)�
Bottom
Time
We have completed the bottom time�
The TTS indicates we have about 1�5 hours or
decompression to do�
The first stop will be at 48m for 1 minute.
Ascending
to First
Stop
Here we are ascending at 3m/min (each bar
beside the depth is 3m/min)� This is slower
than the expected 10m/min ascent rate�
This slow ascent has caused the TTS to rise,
as most tissues are still on-gassing�
First Deco
Stop
The slow ascent has caused the first stop to
clear before we reached it� This often happens
with slow ascents�
Note that the GF99 value now indicates that
the leading tissues are now off-gassing�
However, at this deep depth most tissue
compartments are still on-gassing�
A problem
has developed
The yellow cell reading is disagreeing with the
other two�
A flush with diluent has shown that the lone low
cell is actually correct�
It is decided to bailout to open circuit�
Complex Dive Example
(continued)
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