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9
Press and hold the top right button to enter a
menu or submenu, press the right side buttons
to scroll up and down between available
options or to increase or decrease the value
of a setting. Then press and hold the top right
button to confirm the change in setting. Press
or press and hold the top left button to exit a
menu without saving the last change.
MENU Description
SET DIVE
backlight
Allows you to set the duration
after which the backlight
turns off automatically. You
can set this between 1 and
10 seconds or you can set it
to on. If you set it to on the
backlight will remain on until
you press and hold the lower
left button again to turn it off.
p factor
Allows you to choose between
the standard algorithm (P0)
and an increasingly more
conservative one (P1, P2).
altitude
Allows you to set the
algorithm into altitude mode
when diving in mountain
lakes.
water
Allows you to choose
between salt and fresh water.
units
Allows you to choose
between metric (m, °C) and
imperial (ft, °F) units
fast ascent
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.
alarms
Allows you to turn on or off
all audible alarms of Matrix.
erase desat
Allows you to reset the
nitrogen 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.
factory reset
Sets Matrix back to the
original configuration.
MENU Description
SET WATCH
time
Allows you to set the time.
format
Allows you to choose
between AM/PM and 24-hour
formats
date Allows you to set the date.
second time
Allows you to set a second
time, useful when travelling
to a different time zone.
alarm
Allows you to set a wake-up
alarm
MENU Description
SET COMPASS
declination
Allows you to define the
degrees of compensation
between magnetic north
and geographic north in the
digital compass.
direction
Allows you to define the
direction in which to perform
the compensation.
calibrate
Allows you to recalibrate the
compass.
2.2.1 SET DIVE
2.2.1.1 BACKLIGHT
Matrix has a backlight which can be activated
in case of low ambient light. The backlight is
activated by pressing and holding the bottom
left button. During a dive, the backlight will
stay on for the duration defined in this menu.
You can choose between 1 and 10 seconds,
or you can set it to always on. If you set it to
always on, the backlight will remain on until
you press and hold the lower left button again.
NOTE
- The backlight consumes battery energy:
the longer the backlight stays on high
intensity, the less your battery charge
will last. Whereas with the backlight
always off Matrix uses up about 4-5%
battery charge per hour of diving, with
the backlight always on the battery
consumption per hour of diving goes up
to 8-9%.
- If the low battery warning is activated,
the backlight will be disabled.
In surface mode, the backlight has always a
duration of 6 seconds in either watch display.
If the backlight is on when you enter any menu
or function other than the watch display, it will
remain on until you return to the watch display.
This preserves the battery if you are simply
checking the time, yet allows you to browse at
length through the logbook or change settings
if you wish to do so in low light conditions.
2.2.1.2 P FACTOR
Matrix allows you to set an additional personal
safety factor for those circumstances in which
you want to be especially cautious, such
as after a long period of inactivity or when
planning a strenuous dive. In this menu you
can choose between the standard algorithm
(P0), a more conservative version (P2) or an
intermediate one (P1).
NOTE
The choice of p factor will be reflected in
the dive planner.
2.2.1.3 ALTITUDE
Atmospheric pressure is a function of altitude
and of weather conditions. This is an important
aspect to consider for diving, because the
atmospheric pressure surrounding you has an
influence on uptake and subsequent release
of nitrogen. Above a certain altitude, the
decompression algorithm has to change in
order to account for the effect of the change
in atmospheric pressure. When diving in a
mountain lake, find out what the altitude is and
choose the altitude range in Matrix within the
four available options:
- A0: from sea level to approximately
700m/3300ft;
- A1: from approximately 700m/2300ft to
approximately 1500m/4900ft ;
- A2: from approximately 1500m/4900ft to
approximately 2400m/7900ft;
- A3: from approximately 2400m/7900ft to
approximately 3700m/12100ft;
- We do not recommend diving at altitudes
above 3700m / 12100ft. If you do, set Matrix
to bottom timer and find appropriate
altitude dive tables.
WARNING
Diving in mountain lakes without first
setting Matrix to the proper altitude setting
can cause severe injury or death.
2.2.1.4 WATER
You can set the computer for fresh water or
salt water calibration, depending on where
you intend to dive. Setting the wrong water
type entails an error in depth measurement
of approx 3% (i.e. at a depth of 30m/100ft, a
computer set to salt water will show 29m/97ft
in fresh water whereas a computer set to fresh
water will show 31m/103ft in salt water). Note
that this does not affect the proper functioning
of the computer, since the computer performs
all of the calculations based purely on
pressure measurements.
2.2.1.5 UNITS
You can choose between metric (depth in
meters, temperature in °C) and imperial units.
(depth in feet, temperature in °F).
2.2.1.6 FAST ASCENT
A fast (uncontrolled) ascent is defined as one in
which a speed of 12 m/min / 40ft/min or higher
was maintained over more than two thirds
of the way up. This applies to dives deeper
than 12m/40ft only. In such an event, due to
the potential of harmful bubble formation,
Matrix locks the computer for 24 hours in
order to discourage you from diving again. In
this menu, you have the option to disable the
9


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