14
WARNING
During all dives, perform a safety stop
between 3 and 5 meters/10 and 15 feet for
3minutes, even if no decompression stop
is required.
9.3. FUTURE DECOMPRESSION
In case of a decompression dive, the
sequence also features ASC+5. The value
shown represents the total ascent time if
you were to remain at the current depth for
an additional 5 minutes. This is very useful
since it allows you to estimate how your
decompression will be affected by remaining at
the current depth a while longer (Fig. 22).
It is also very useful because, as the slower
tissues start accumulating nitrogen, you
could find yourself in a situation in which
the decompression time grows very quickly,
so much so that you may find yourself with
insufficient gas to finish the dive.
NOTE
Associated to a large difference between
the current ASC and the ASC+5 value,
Genius will alert you with the RUNAWAY
DECO warning: since the ASC+5 calculation
runs in the background and is permanently
updated, Genius monitors this value and,
if it is calculated to be greater than 10
minutes beyond the current ASC, Genius
will trigger the alarm RUNAWAY DECO.
This remains on the display until you press
any button to acknowledge having seen it
(Fig. 23).
NOTE
The prediction of ASC can be set between
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
minutes.
Likewise, the trigger point of the
RUNAWAY DECO alarm can be set between
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 DECO
to a value of 3, the alarm will be triggered
when the difference between the current
ASC and the predicted one 6 minutes later
is 6*3=18 minutes or greater.
9.4. DIVE PROFILE
During the dive you can view the depth profile
performed so far by pressing . The profile is
updated every 20 seconds. The top row now
shows current depth and no deco time (or total
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 remove it (by
clicking through the whole sequence) in case it
overlaps with the dive profile.
NOTE
The display remains in dive profile mode
until you press or until an alarm is
triggered, in which case the display reverts
to the standard display.
9.5. COMPASS
During the dive you can access the compass
by pressing . In COMPASS mode, the top
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 well:
squares at 90 degrees, triangles at 120
degrees and two parallel lines at 180 degrees,
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 to
the set bearing. If you press again, the new
bearing will override the one in memory. If you
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 you
press , the stop watch restarts from 00:00.
By pressing
, the top row goes back to full
size but the stop watch keeps running in the
background (Fig. 26).
NOTE
The display remains in compass mode until
you press or until an alarm is triggered,
in which case the display reverts to the
standard display.
9.6. TISSUE SATURATION GRAPH
By pressing and holding the right button ( ) a
complete description of the current tissue
saturation fills the space underneath the top
row. The top row itself shows current depth
and no deco time (or total ascent time in case
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
continuously.
The graph shows the tissue tension in each
of the 16 compartments simulated by the
algorithm, both the instantaneous value (left
bar, green or yellow) and the projected value at
the surface after an ascent at the allowed rate
(right bar, blue or red) together with dotted
lines representing the maximum tolerated
supersaturation values at the surface and,
in presence of decompression stops, at the
depth of all calculated stops. The vertical axis
represents pressure. As long as the right bar
(projected value at the surface) remains below
the dotted line, that particular tissue does not
require decompression. When one of the right
tissues pushes past the lower dotted line, a
decompression stop will be required (failure
to meet the safe ascent criterion) and the bar
itself changes from blue to red. If a right bar
were to push past the second dotted line, there
would be a 6m / 20ft stop required in addition
to a 3m / 10ft stop.
For air and nitrox dives, on the graph there is
also a horizontal black line: this represents, on
the same pressure scale, the partial pressure
of nitrogen in the inhaled gas. The distance
between the line and the left bar represents
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
above the left bar, the tissue in question is
taking on gas and the bar is depicted in yellow.
Once the line descends into the left bar, the
tissue in question is offgassing and the bar
becomes green. More information about
this can be found in the download section of
www.mares.com.
9.7. DECO SUMMARY TABLE
From the tissue saturation graph, press to
view the DECO SUMMARY TABLE. This shows
the following four decompression calculations
(Fig. 28):
- the predictive multigas decompression
schedule for the MAIN GF values (not
available for single gas dives)
- the decompression calculation assuming the
dive is finished with the gas currently active,
for the MAIN GF values
- the predictive multigas decompression
schedule for the ALTERNATE GF values (not
available for single gas dives)
- the decompress ion calculation assuming
the dive is finished with the gas currently
active, for the ALTERNATE GF values.
This gives you an overview of all the
alternatives available to you in case you ran
out of one or more gases and/or you decided to
switch to the alternate GF values.
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