Operations Manual Perdix
Manual DocRev B
62
STOP
DEPTH
TIME
0
TIME
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NDL Display @+5
1.2
GasPO2
4
The last selection is
@+5
. This feature was inspired
by Dan Wible’s CCR2000 computer (Thanks Dan!)
It is the time-to-surface (TTS) if you were to stay at
the current depth for five more minutes. This can
be used as a measure of how much you are on-
gassing or off-gassing.
For example, on a dive on a wreck, you go to
the bottom until you accumulate the desired
decompression and TTS. After ascending to the
second deck, you notice that the @+5 and TTS
are the same. That means that you can spend 5
minutes exploring this deck without incurring more
decompression.
Once you get to the top deck, the current has
picked up. The line runs from the top of the deck
to the surface which is a distance of 30 feet/10 m.
You see that your @+5 is 11 minutes and your TTS
is 15 minutes. That means that you can stay down
out of the current for 5 minutes and burn off about
4 minutes of deco. You may decide to accept the
80% decompression efficiency and stay out of the
current.
When your TTS is 10 minutes, you see that your
@+5 is 9 minutes. Since the decompression is not
very efficient now, you go up the line and spend
the last 10 minutes in the current.
When your TTS is 10 minutes, you see that your
@+5 is 9 minutes. Since the decompression is not
very efficient now, you go up the line and spend
the last 10 minutes in the current.
The last selection option is
Δ
+5 .
This feature is an
expansion on
@+5
where the value displayed is the
difference between
@+5
and TTS. This value lets
you know at a glance if you are on-gassing or off
gassing without having to compare TTS and
@+5
directly.
If you are on-gassing,
Δ
+5
will show a positive
time in minutes. If you are off-gassing,
Δ
+5
will
show a negative time in minutes. This will give
you a quick real-time indication of how your
decompression schedule is changing.
5
DEPTH
TIME
0
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NDL Display
∆
+5
.21
GasPO2
SURFACE
2
h
45
m
