7
• 2. SET DIVE
MENU Description
SET DIVE
MODE
Allows you to choose
between air, nitrox, trimix and
bottom timer mode.
ALGORITHM
Allows you to set main and
alternate gradient factors,
personalization levels, and
more.
GAS
INTEGRATION
Allows you to synchronize
your Genius with optional
tank modules and to define
all parameters concerning
gas integration (tank volume,
operating tank pressure, tank
reserve and more).
WARNINGS
Allows you to define and
activate certain warnings
individually
MULTIGAS
Allows you to define
parameters relating to
multigas dives.
FUTURE
DECO
Allows you to set the
parameters for the future
deco prediction. Please refer
to section 2.6 for more details
on this.
WATER
Allows you to choose
between salt and fresh water.
NIGHT MODE
Allows you to choose the night
mode display (white numbers
on black background) as
default display.
DEEP STOP
Allows you to activate or
deactivate the visualization of
deep stops.
DECO STOP
Allows you to choose the
depth of the shallowest stop
among 3m/10ft, 4.5m/15ft,
6m/20ft.
SECONDS
Allows you to show the dive
time in minutes and seconds.
LINKED MAP
Allows you to select a map
which you can call up on the
display during the dive.
ERASE
DESAT
Allows you to reset the
inert gas saturation to zero,
thereby erasing the effects of
a previous dive. This is only for
people who plan to lend their
computer to another diver
who has not performed a dive
within the last 24 hours.
ALL SILENT
MODE
Allows you to silence the dive
computer.
ASCENT
VIOLATION
Allows you to turn off the dive
violation due to uncontrolled
ascent. This is for dive
instructors only, who may
find themselves in such a
situation because of their
teaching requirements.
2.1. MODE
In this menu you define the type of gas you
will be breathing during the dive (AIR as
SINGLE GAS, NITROX as SINGLE GAS, NITROX
as MULTIGAS, TRIMIX as MULTIGAS). You
can also set Genius to BOTTOM TIMER, in
which case Genius will show only time, depth
and temperature: it will not carry out any
decompression calculation and it will not show
any warnings and alarms.
Use
and to highlight your choice,
then press SELECT to activate it. AIR is the
equivalent of setting NITROX to 21% and a
ppO
2
max of 1.4bar.
When selecting NITROX, you are taken to
a submenu in which you can define the
percentage of oxygen in the mixture (O
2
%) and
the maximum value of oxygen partial pressure
(ppO
2
max) for up to three breathing mixes. The
maximum possible value for the ppO
2
max is
1.6bar. Most training agencies recommend not
to exceed a value of 1.4bar.
Once inside this menu, use
and to change
the O
2
%, and watch how this affects the
maximum operating depth (MOD). Then press
NEXT to move on to the ppO
2
max and use
and to change the value, again noticing
how this affects the MOD. Press SET to save
and exit the menu. Note that you can press
BACK after having set the O
2
% to save and exit
skipping the ppO
2
max setting.
WARNING
- Diving with Nitrox may only be
attempted by experienced divers after
proper training from an internationally
recognized agency.
- Before every dive and after changing
the tank, you must make sure that the
set oxygen concentration in Genius
corresponds to the oxygen concentration
in the tank. Setting the wrong oxygen
concentration can lead to serious injury
or death.
This is also the menu where you would be
setting your decompression gases if you dived
with more than one gas. See chapter 11 for
more information about diving with more than
one gas or for dives with trimix.
2.2. ALGORITHM
Genius employs the unmodified Bühlmann
ZH-L16C algorithm with gradient factors.
Gradient factors are used to lower the
maximum tolerated supersaturation in the
tissues with respect to Bühlmann’s original
values. This results in less nitrogen in the body
at the end of the dive, which under normal
circumstances makes the dive safer. Gradient
factors are expressed in pairs: the first value,
also called GF low, represents the percentage
of the original Bühlmann value that defines the
beginning of the final ascent (relevant only in
decompression dives); the second value, also
called GF high, represents the percentage of
the original Bühlmann value that defines the
residual nitrogen at the surface at the end of
a dive. As an example GF 50/85 will get you
to the surface with a 15% additional margin
with respect to Bühlmann’s original maximum
tolerated supersaturation and, if this was a
decompression dive, your first decompression
stop would have been at a depth such that you
would not have exceeded 50% of Bühlmann’s
original value at that depth.
For more information about
gradient factors, please refer to
www.mares.com/sports/diving/gradientfactor
From the home display, press and hold the
third button from the left (GF) to display a table
listing all settings (Fig. 6).
2.2.1. MAIN GF
This is where you set the conservatism level
of the ZH-L16C algorithm via gradient factors.
We use Bühlmann’s original values reduced by
15% as a starting point, and you can make the
algorithm more conservative from there. There
are four predefined sets of gradient factors
with increasing conservatism from R0 (85/85)
to R3 (50/60) for recreational dives and from
T0 (30/85) to T3 (25/40) for tech dives. You
can also enter the GF low and GF high values
directly via the CUSTOM setting. The default
value is R0 (85/85).
2.2.2. ALTERNATE GF TO BE INTRODUCED
VIA FREE FIRMWARE UPGRADE
SOON
Genius allows you to define an alternate set
of gradient factors, to use when you need
to cut your decompression short in case of
an emergency. The set of alternate gradient
factors cannot be more conservative (i.e.
lower) than the main set of GF values. The
default value is R0 (85/85).
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