How-To Guide

CXR-I Dive Comput er
9.4. DIVE PROFILE
During the dive you can view the depth pr ofil e
performed so far by pressing . The profile is
updated every 20 seconds. The top row no w
shows current depth and no deco time (or t ot al
ascent time in case of decompression dives, in
which case the profile shows also all
decompression stops) so that you can keep the
profile on the display and still have all the
major information about the dive (Fig. 24).
With the button you can call up one
additional piece of information but, unlike in
the standard display, you can also r emo v e it (by
clicking through the whole sequence) in case it
o v erlaps with the dive pr ofil e.
9.6. TISSUE SATURATION GRAPH
By pressing and holding the right button ( ) a
complete description of the current tis sue
saturation fills the space underneath the t op
row. The top row itself shows current depth
and no deco time (or total ascent time in c ase
of decompression dives) so that you can keep
the tissue saturation graph on the display and
still have all the major information about the
dive (Fig. 27). The graph itself is updated
continuousl y .
The graph shows the tissue tension in each
of the 16 compartments simulated by the
algorithm, together with red segments
representing the maximum t ol erat ed
supersaturation values at the surface and,
in presence of decompression stops, at the
depth of all calculated stops. The v ertical
axis represents pressure. As long as a
tissue remains below the red segments,
that particular tissue does not r equir e
decompression. When a tissue pushes pas t
the lower red segment, a decompr es sion
stop will be required (failure to meet the saf e
ascent criterion). If a tissue were to push pas t
the second red segment, there would be a 6m
/ 20ft stop required in addition to a 3m / 10ft
s t op.
For air and nitrox dives, on the graph there is
also a horizontal black line: this represents, on
the same pressure scale, the partial pr es sure
of nitrogen in the inhaled gas. The dis t anc e
between the line and top of a bar r epr esents
the pressure difference driving gas in or out of
a tissue and is thus indicative of the speed of
on or offgassing. As long as the line is abo v e
the bar, the tissue in question is taking on gas
and the bar is depicted in y ell o w .
Once the line descends into the bar, the tis sue
in question is offgassing and the bar bec omes
green.
9.3. FUTURE DECOMPRESSION
In case of a decompression dive, the
sequence also f eatur es ASC+5 . The v alue
shown represents the total ascent time if
you were to remain at the current depth f or
an additional 5 minutes. This is very useful
since it allows you to estimate how y our
decompression will be affected by remaining at
the current depth a while longer (Fig. 22).
It is also very useful because, as the sl o w er
tissues start accumulating nitrogen, y ou
could find y ourself in a situation in which
the decompression time grows very quickl y ,
so much so that you may find y ourself with
insufficient gas to finish the div e.
9.5. COMPASS
During the dive you can access the c ompas s
by pressing . In COMPASS mode, the t op
row of the display shows current depth and no
deco time (or total ascent time in the case of
decompression dives), so that you can keep the
compass on the display and still have all the
major information about the dive (Fig. 25).
With , you can set a reference bearing. A dot
will appear to indicate the set bearing.
Additional symbols will appear as w ell:
squares at 90 degrees, triangles at 120
degrees and two parallel lines at 180 degr ees,
as an aid in navigation for square, triangular
and reciprocal courses. The number at
the bottom represents the deviation of the
direction you are pointing at with reference t o
the set bearing. If you press again, the ne w
bearing will o v erride the one in memory. If y ou
press and hold you erase the bearing.
By pressing , the top row is split in two and
a stop watch appears in the lower row. Use
to activate the stop watch. Every time y ou
press , the stop watch restarts from 00:00.
By pressing , the top row goes back to full
9.7. DECO SUMMARY TABLE ( T O
BE INTRODUCED VIA FREE
FIRMWARE UPGRADE SOON)
From the tissue saturation graph, press to
view the DECO SUMMARY TABLE. This sho ws
the following four decompression c alculations
(Fig. 28):
size but the stop watch keeps running in the
background (Fig. 26).
-
the predictive multigas decompr es sion
schedule for the MAIN GF values (not
available for single gas div es)
the decompression calculation assuming the
dive is finished with the gas curr entl y activ e,
for the MAIN GF v alues
the predictive multigas decompr es sion
schedule for the ALTERNATE GF values (not
available for single gas div es)
the decompress ion calculation as suming
the dive is finished with the gas curr entl y
active, for the ALTERNATE GF v alues.
-
-
-
This gives you an overview of all the
alternatives available to you in case you r an
out of one or more gases and/or you decided t o
switch to the alternate GF v alues.
14
NOTE
The display remains in compass mode until
you press or until an alarm is triggered,
in which case the display r e v erts to the
standard display .
NOTE
The prediction of ASC can be set betw een
3 and 10 minutes in advance via the ASC+X
menu within FUTURE DECO in SET DIVE.
The value of X can be set between 3 and 10
minut es.
Likewise, the trigger point of the
RUNAWAY DECO alarm can be set betw een
2 and 4 times the value of X . As an
example, if you set the prediction of ASC
to a value of +6 and the RUNAWAY DEC O
to a value of 3, the alarm will be triggered
when the difference between the current
ASC and the predicted one 6 minutes lat er
is 6*3=18 minutes or gr eater .
NOTE
Associated to a large difference betw een
the current ASC and the ASC+5 v alue, CXR-
I will alert you with the RUNA WA Y DECO
warning: since the ASC+5 c al culation runs
in the background and is permanentl y
updated, CXR-I monitors this value and,
if it is calculated to be greater than 10
minutes beyond the current ASC , CXR-I
will trigger the alarm RUNAWAY DEC O .
This remains on the display until you pr es s
any button to acknowledge having seen it
(Fig. 23).
NOTE
The display remains in dive profile mode
until you press or until an alarm is
triggered, in which case the display r e v erts
to the standard display .
W ARNING
During all dives, perform a safety s t op
between 3 and 5 meters/10 and 15 feet f or
3 minutes, even if no decompression s t op
is r equired.