SUUNTO DX
USER GUIDE
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5 Reference ........................................................................................ 77
Index .................................................................................................. 89
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1 SAFETY
Types of safety precautions
WARNING: - is used in connection with a procedure or situation
that may result in serious injury or death.
CAUTION: - is used in connection with a procedure or situation
that will result in damage to the product.
NOTE: - is used to emphasize important information.
TIP: - is used for extra tips on how to utilize the features and
functions of the device.
Before you dive
Make sure that you fully understand the use, displays and
limitations of your dive instruments. If you have any questions
about this manual or the dive computer, contact your Suunto dealer
before diving with the dive computer. Always remember that YOU
ARE RESPONSIBLE FOR YOUR OWN SAFETY!
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Safety precautions
WARNING: ONLY TRAINED DIVERS SHOULD USE A DIVE
COMPUTER! Insufficient training for any kind of diving, including
freediving, may cause a diver to commit errors, such as incorrect use
of gas mixtures or improper decompression, that may lead to
serious injury or death.
WARNING: You must read the printed quick guide and online
user guide for your dive computer. Failure to do so may lead to
improper use, serious injury or death.
WARNING: THERE IS ALWAYS A RISK OF DECOMPRESSION
SICKNESS (DCS) FOR ANY DIVE PROFILE EVEN IF YOU FOLLOW THE
DIVE PLAN PRESCRIBED BY DIVE TABLES OR A DIVE COMPUTER. NO
PROCEDURE, DIVE COMPUTER OR DIVE TABLE WILL PREVENT THE
POSSIBILITY OF DCS OR OXYGEN TOXICITY! An individual’s
physiological make up can vary from day to day. The dive computer
cannot account for these variations. You are strongly advised to
remain well within the exposure limits provided by the instrument
to minimize the risk of DCS. As an added measure of safety, you
should consult a physician regarding your fitness before diving.
WARNING: If you have a pacemaker, we recommend you do not
scuba dive. Scuba diving creates physical stresses on the body which
may not be suitable for pacemakers.
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WARNING: If you have a pacemaker, consult a doctor before
using this device. The inductive frequency used by the device may
interfere with pacemakers.
WARNING: Allergic reactions or skin irritations may occur when
product is in contact with skin, even though our products comply
with industry standards. In such event, stop use immediately and
consult a doctor.
WARNING: Not for professional use! Suunto dive computers are
intended for recreational use only. The demands of commercial or
professional diving may expose the diver to depths and conditions
that tend to increase the risk of decompression sickness (DCS).
Therefore, Suunto strongly recommends that the device not be used
for any commercial or professional diving activities.
WARNING: USE BACKUP INSTRUMENTS! Ensure that you use
backup instrumentation, including a depth gauge, submersible
pressure gauge, timer or watch, and have access to decompression
tables whenever diving with a dive computer.
WARNING: For safety reasons, you should never dive alone. Dive
with a designated buddy. You should also stay with others for an
extended time after a dive as the onset of possible DCS may be
delayed or triggered by surface activities.
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WARNING: PERFORM PRE-CHECKS! Always check that your dive
computer is functioning properly and has the correct settings
before diving. Check that the display is working, the battery level is
OK, tank pressure is correct, and so forth.
WARNING: Check your dive computer regularly during a dive. If
there is any apparent malfunction, abort the dive immediately and
safely return to the surface.
WARNING: THE DIVE COMPUTER SHOULD NEVER BE TRADED OR
SHARED BETWEEN USERS WHILE IT IS IN OPERATION! Its
information will not apply to someone who has not been wearing it
throughout a dive, or sequence of repetitive dives. Its dive profiles
must match that of the user. If it is left on the surface during any
dive, the dive computer will give inaccurate information for
subsequent dives. No dive computer can take into account dives
made without the computer. Thus, any diving activity up to four
days prior to initial use of the computer may cause misleading
information and must be avoided.
WARNING: DO NOT EXPOSE ANY PART OF YOUR DIVE
COMPUTER TO ANY GAS MIX CONTAINING MORE THAN 40%
OXYGEN! Enriched air with greater oxygen content presents a risk
of fire or explosion and serious injury or death.
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WARNING: DO NOT DIVE WITH A GAS IF YOU HAVE NOT
PERSONALLY VERIFIED ITS CONTENTS AND ENTERED THE
ANALYZED VALUE INTO YOUR DIVE COMPUTER! Failure to verify
tank contents and enter the appropriate gas values where
applicable into your dive computer will result in incorrect dive
planning information.
WARNING: Using a dive planner software such as in Suunto DM5
is not a substitute for proper dive training. Diving with mixed gases
has dangers that are not familiar to divers diving with air. To dive
with Trimix, Triox, Heliox and Nitrox or all of them, divers must
have specialized training for the type of diving they are doing.
WARNING: Do not use Suunto USB Cable in areas where
flammable gases are present. Doing so may cause an explosion.
WARNING: Do not disassemble or remodel Suunto USB Cable in
any way. Doing so may cause an electric shock or fire.
WARNING: Do not use Suunto USB cable if cable or parts are
damaged.
CAUTION: DO NOT allow the connector pins of the USB cable to
touch any conductive surface. This may short circuit the cable,
making it unusable.
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Emergency ascents
In the unlikely event that the dive computer malfunctions during a
dive, follow the emergency procedures provided by your certified
dive training agency to immediately and safely ascend.
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2 GETTING STARTED
2.1 Display states and views
Suunto DX has four main modes: TIME, DIVE, PLANNING and
MEMORY. Change modes by pressing [MODE].
Unless DIVE mode is turned off, Suunto DX automatically switches
to DIVE mode if you are more than 1.2 m (4 ft) under water.
DIVE
PLAN
MEM
12:00
12:00
1.12 TH
1.12 TH
Time and dive modes have different views in the bottom row which
you can scroll through with [DOWN] and [UP].
2.2 Icons
Suunto DX uses the following icons:
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1.
8.
9.
2.
3.
4.
5.
6.
10.
7.
Icon
Description
1
2
3
4
Daily alarm
Dive alarm
No-fly
Safety stop
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Icon
5
Description
Tank pressure (if available)
Wireless transmission (if available)
Low battery
6
7
8
Active water contact
Diver attention symbol
Ascent rate
9
10
2.3 Set up
To get the most out of your Suunto DX, take some time to read this
manual and familiarize yourself with the modes and settings. Make
absolutely sure you have it set up as you want before getting into
the water.
To get started:
1. Wake up the device by keeping any button pressed until the
display turns on.
2. Keep [DOWN] pressed to enter General Settings.
6. Press [MODE] to exit settings.
The default dive mode is Air. For more information on dive modes,
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2.4 Software version check
Please note that this user guide is for the latest software version of
Suunto DX. If you have an older version, some features operate
differently.
To check the software version:
1. Keep [DOWN] pressed to enter settings.
2. Press [DOWN] to scroll to Version and enter with [SELECT].
3. The first line of information indicates the software version.
•
If the version number is V1.5.x or higher, you can skip the
rest of this section and read the user guide as normal.
If the version number is V1.2.x please read the sections below
regarding how to use specific features.
•
4. Press [MODE] twice to exit settings.
NOTE: When you send your watch to an authorized Suunto
service center for a battery change or other servicing, the software
will be updated to the latest version.
Dive modes
Each time you enter dive mode, you have the option of selecting
which mode to use.
To change dive modes:
1. While in time mode, press [MODE] to enter dive mode.
2. Scroll to the dive mode you want to use with [UP] or [DOWN].
3. Wait for the pre-checks to complete.
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To change settings for a dive mode, keep [DOWN] pressed while in
that mode. For further information about dive mode settings,
please refer to the respective dive mode section of this user guide.
Stopwatch
Access the stopwatch in time or dive mode as explained in
To use the stopwatch:
1. Press [DOWN] to start the stopwatch.
2. While the stopwatch is running, press [DOWN] to take split
times.
3. Press [UP] to stop the stopwatch.
4. Keep [UP] pressed to reset the stopwatch.
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3 FEATURES
3.1 Activation and pre-checks
Unless the dive mode turned off, the dive mode activates
automatically when you dive deeper than 1.2 m (4 ft). However, you
should switch to dive mode before diving to check altitude and
personal settings, battery condition and so on.
Each time your Suunto DX enters dive mode, a series of automatic
checks are performed. All graphical display elements are turned ON,
and the backlight and the beep are activated. After this, your
altitude and personal settings are displayed along with the
maximum operating depth (MOD), gas content, and PO values.
2
Then the battery level is checked.
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12:00
DIVE
Air
1.12 TH
66.2m
PO
AO
Battery
OK
21
1.6
Between consecutive dives, the automatic checks also show current
tissue saturation.
66.2m
PO
AO
21
1.6
Before leaving on a dive trip, it is highly recommended that you
switch to dive mode to make sure everything is functioning
properly.
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After the automatic checks, Suunto DX enters surface mode. At this
point, you should perform your manual checks before entering the
water.
Ensure that:
1. Suunto DX is in the correct mode and provides complete
displays.
2. Altitude setting is correct.
3. Personal setting is correct.
4. Deepstops are set correctly.
5. Unit system is correct.
6. Correct temperature and depth are shown.
7. The alarm beeps.
3.1.1 Wireless Transmitter pre-check
If the optional wireless tank pressure transmitter is used, check that:
1. Tank gas and O settings are correct.
2
2. The transmitter is properly installed and the tank valve is open.
3. The transmitter and Suunto DX are paired.
4. The transmitter is sending data (wireless transmission icon blinks,
tank pressure is displayed).
5. There is no transmitter low battery warning.
6. There is enough air for your planned dive. Check the pressure
reading against your back-up pressure gauge.
3.1.2 Battery indicators
Temperature or internal oxidation can affect the battery voltage. If
you store your Suunto DX for a long period or use it in cold
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temperatures, the low battery warning may appear even though
the battery has enough capacity.
In these cases, re-enter dive mode and check the battery power. If
the battery is low, the Low Battery warning comes on.
Replace
Battery
Battery
Low
12:00
1.12 TH
If the low battery icon appears in surface mode, or if the display
looks faded, the battery may be too low. Battery replacement is
recommended.
NOTE: For safety reasons, the backlight and buzzer (sound)
cannot be activated when the low battery warning is displayed.
3.2 Alarms, warnings and notifications
Suunto DX has audible and visual alarms designed to let you know
when important limits or presets are being reached.
The two audible alarm types indicating high or low priority:
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Alarm type
Sound pattern
Duration
2.4 s sound + 2.4 s
break
High priority
0.8 s sound + 3.2 s
break
Low priority
In addition, there are two audible guidance notifications:
Instructional
beep
Sound pattern
Interpretation
Ascending
Start ascending
Start descending
Descending
Suunto DX displays information during the alarm breaks in order to
save battery life.
High priority alarms:
Alarm
Explanation
PO value greater than the adjusted
2
value. Current depth is too deep for
the gas in use. You should immediately
High priority alarm
followed by 'Start
ascending' beep,
ascend or change to a lower O % gas.
2
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Alarm
Explanation
repeated for maximum
three minutes
PO value blinks
2
PO value is smaller than 0.18 bar
2
High priority alarm
followed by 'Change gas'
beep, sounded two
times.
(Mixed or CCR mode only). The depth
is too shallow and the ambient
pressure is too low for the current gas.
The oxygen content is too low; you
may lose conscious. You should
immediately switch the gas.
PO value blinks
2
High priority alarm
followed by 'Start
descending' beep,
repeated for maximum
three minutes Er blinks
and an arrow points
downwards.
Decompression ceiling depth
exceeded. You should immediately
descend to, or below, the ceiling.
High priority alarm,
repeated three times.
Maximum ascent rate of 10 m/min (33
ft/min) exceeded. Slow down your
ascent rate.
SLOW blinks.
Low priority alarms:
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Alarm type
Alarm reason
Low priority alarm
followed by 'Start
ascending' beep,
sounded two times.
No-decompression dive becomes a
decompression stop dive. Depth is
below the decompression floor level.
You should ascend to, or above, the
floor.
ASC TIME blinks and an
arrow points upwards.
Low priority alarm
Gas change is recommended (Mixed or
followed by Change gas' CCR mode only). You should change to
beep. The gas mix a gas more favorable to
percentage value blinks. decompression. Ascent time
calculation assumes that the gas is
changed and is therefore only accurate
if you have changed the gas
accordingly.
Low priority alarm
followed by "Change
gas" beep, sounded
once. The backlight is lit
and text "Set Point
selected is displayed
shortly.
The setpoint has been switched
automatically upon reaching the
defined depth (CCR mode only).
Low priority alarm
followed by 'Start
descending' beep.
Mandatory deepstop violated. You
should descend to complete the
deepstop.
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Alarm type
Alarm reason
DEEPSTOP blinks and an
arrow points
downwards.
Low priority alarm
followed by 'Start
descending' beep,
repeated for three
minutes.
Mandatory safety stop violated. You
should descend to complete the safety
stop.
An arrow points
downwards.
Low priority alarm
followed by two short
beeps.
Deepstop depth reached. Make the
mandatory deepstop for the duration
shown by the timer.
DEEPSTOP and timer
displayed.
Low priority alarm,
repeated twice.
Tank pressure reaches the defined
alarm pressure or the fixed alarm
pressure, 50 bar (700 psi).
Acknowledge the alarm by pressing
any button.
Tank pressure value
blinks.
Low priority alarm,
repeated twice.
OLF value at 80% or 100% (Mixed or
CCR mode only). Acknowledge the
alarm by pressing any button.
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Alarm type
Alarm reason
OLF% value blinks if PO
2
value is greater than 0.5
bar.
Low priority alarm,
repeated twice.
Defined maximum depth or the
maximum depth of the device
exceeded. Acknowledge the alarm by
pressing any button.
Maximum depth value
blinks
Low priority alarm,
Defined dive time exceeded.
repeated twice; dive time Acknowledge the alarm by pressing
value blinks
any button.
Visual alarms
Symbol on display
Indication
Attention - extend surface interval
Violated decompression ceiling or
bottom time is too long
ER
Do not fly
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3.3 Ascent rate
The ascent rate is displayed as a vertical bar along the right side of
the display.
18.3
25
21,5 20
When the maximum allowed ascent rate is exceeded, the lower
segment of the bar starts to blink and the top segment stays solid.
14.8
35
21,5 20
Continuous ascent rate violations result in mandatory safety stops.
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WARNING: DO NOT EXCEED THE MAXIMUM ASCENT RATE!
Rapid ascents increase the risk of injury. You should always make
the mandatory and recommended safety stops if you have exceeded
the maximum recommended ascent rate. If the mandatory safety
stop is not completed, the decompression algorithm penalizes your
next dive(s).
3.4 Backlight
To active the backlight in dive mode, press [MODE].
In other modes, keep [MODE] pressed until the backlight activates.
You can define how long the backlight stays on when you activate
it or turn the backlight off altogether.
To set backlight duration:
1. While in time mode, keep [DOWN] pressed.
2. Press [DOWN] to scroll to BACKLIGHT and press [SELECT].
3. Set duration or turn off with [DOWN] or [UP].
4. Press [MODE] to save and exit to settings.
NOTE: When the backlight is off, it does not illuminate when an
alarm sounds.
3.5 Bookmarks
At any time during a dive, you can add a bookmark to the dive log
by pressing [SELECT].
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You can view bookmarks when scrolling the dive profile in the
logbook.
Each bookmark records present depth, time, water temperature,
heading (if the compass is enabled), and tank pressure (if available).
3.6 Calendar clock
The calendar clock is the default mode of Suunto DX .
3.6.1 Time
In the time settings, you can set the hours, minutes, seconds, and
format (12 or 24-hour).
To set time:
1. While in time mode, keep [DOWN] pressed.
2. Press [UP] to scroll to Time and press [SELECT].
3. Set hours with [DOWN] or [UP] and confirm with [SELECT].
4. Repeat for minutes and seconds.
Set the format with [DOWN] or [UP] and confirm with [SELECT].
5. Press [MODE] to exit.
3.6.2 Date
The date and weekday are shown in the bottom row of time mode.
Press [DOWN] to toggle between views.
To set the date:
1. While in time mode, keep [DOWN] pressed.
2. Press [UP] to scroll to Date and press [SELECT].
3. Set year with [DOWN] or [UP] and accept with [SELECT].
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4. Repeat for month and day.
5. Press [MODE] to exit.
3.6.3 Units
In the units setting, choose whether the units are displayed in the
metric or Imperial system.
1. While in time mode, keep [DOWN] pressed.
2. Press [UP] to scroll to Units and press [SELECT].
3. Press [DOWN] to toggle between Metric and Imperial and
confirm with [SELECT].
4. Press [MODE] to exit.
3.6.4 Dual time
Dual time allows you to keep track of the time in a second time
zone. Dual time is shown in the bottom left of the time mode
display by pressing [DOWN].
To set dual time:
1. While in time mode, keep [DOWN] pressed.
2. Press [UP] to scroll to Dual Time and press [SELECT].
3. Set hours with [DOWN] or [UP] and confirm with [SELECT].
4. Repeat for minutes.
5. Press [MODE] to exit.
3.6.5 Alarm clock
Suunto DX has a daily alarm which can be set to activate once, on
weekdays or every day.
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When the daily alarm activates, the screen blinks and the alarm
sounds for 60 seconds. Press any button to stop the alarm.
To set the daily alarm:
1. While in time mode, keep [DOWN] pressed.
2. Press [UP] to scroll to Alarm and press [Select.]
3. Select alarm activation with [DOWN] or [UP] and confirm with
[Select].
The options are OFF, ONCE, WEEKDAYS, or EVERY DAY.
4. Set hours with [DOWN] or [UP ]and confirm with [SELECT].
5. Repeat for minutes.
6. Press [MODE] to exit.
3.7 Compass
Suunto DX includes a digital compass.
The tilt-compensated compass gives you accurate readings even if
the compass is not horizontally level.
The compass can be activated from either time or dive mode and
shows the current bearing and depth.
1. While in TIME or DIVE mode, keep [SELECT] pressed to activate
the compass.
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2. Press [MODE] to exit the compass display.
When in dive mode, the compass display includes additional
information in the bottom left and right views.
1. Press [DOWN] to scroll through the bottom left views. (tank
pressure, max. depth, time)
2. Press [UP] to scroll through the bottom right views. (dive time,
temperature, bearing)
3.7.1 Calibrating compass
When you first start using Suunto DX, the compass needs to be
calibrated. Suunto DX displays the calibration icon when you enter
the compass.
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Calibrate the compass by slowly rotating the unit in your hand in
large figure-8 loops..
During the calibration process, the compass adjusts itself to the
surrounding magnetic field.
If the calibration fails,Try Again appears. If calibration continues to
fail, move to another location and try again.
When traveling overseas, it is recommended that you recalibrate
the compass at the new location before using it.
To manually start the calibration:
1. While in the compass view, keep [DOWN] pressed.
2. Press [DOWN] to scroll to Calibration.
3. Press [SELECT] to start the calibration.
3.7.2 Setting declination
You should always adjust your compass declination for the area
where you are diving to get accurate heading readings. Check the
local declination from a trusted source and set the value in Suunto
DX.
1. While in the compass view, keep [DOWN] pressed.
2. Press [DOWN] to scroll to DECLINATION and press [SELECT].
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3. Press [DOWN] to toggle to East or West and confirm with
[SELECT].
4. Set Declination Degrees with [DOWN] or [UP].
5. Press [MODE] to save and exit.
3.7.3 Setting compass timeout
You can define how long the compass stays on after you have
activated it. Reset the timeout with any button press while using
the compass.
After the timeout, the Suunto DX returns to time or dive mode.
To set the timeout:
1. While in the compass display, keep [DOWN] pressed.
2. Press [DOWN] to scroll to Timeout and press [SELECT].
3. Adjust the timeout time with [DOWN] or [UP].
4. Press [MODE] to exit.
3.7.4 Setting bearing lock
A bearing is the angle between north and your target. In simple
terms, it is the direction you want to travel. Your heading, on the
other hand, is your actual direction of travel.
The default bearing is North.
You can set a bearing lock to help you orientate yourself
underwater and ensure you maintain your direction of travel. For
example, you can set a bearing lock for the direction to a reef
before leaving the boat.
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The last locked bearing is stored and available the next time the
compass is activated. In DIVE mode, the locked bearings are also
stored in the log. To lock a bearing:
1. With the compass active, hold the watch in front of you and turn
yourself towards your target.
2. Press [SELECT] to lock the current degree displayed on the watch
as your bearing.
3. Press [SELECT] to clear the lock.
If, at any point, your bearing moves outside the compass display,
right or left arrows appear to show turn direction.
Suunto DX provides help for navigating square and triangular
patterns, as well as navigating a return heading with the following
symbols.
Symbol
Explanation
You are traveling towards the locked
bearing.
You are 90 (or 270) degrees from the
locked bearing.
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Symbol
Explanation
You are 180 degrees from the locked
bearing.
You are 120 (or 240) degrees from the
locked bearing.
3.8 Depth alarm
By default the depth alarm sounds at 30 m (100 ft). You can adjust
the depth according to your personal preference or switch it off.
To adjust the depth alarm:
1. While in a dive mode, keep [DOWN] pressed to enter settings.
2. Press [UP] to scroll to Depth Alarm and press [SELECT].
3. Press [UP] to toggle the alarm on/off and confirm with [SELECT].
4. Adjust depth with [DOWN] or [UP] and accept with [SELECT].
5. Press [MODE] to exit.
When the depth alarm activates, the backlight blinks and the low
priority audible alarm pattern sounds. Acknowledge the alarm by
pressing any button.
3.9 Display contrast
You can adjust the contrast of the display according to your
preference or, for example, to suite changing dive conditions.
1. While in time mode, keep [DOWN] pressed.
2. Press [UP] to scroll to Contrast and press [Select].
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3. Use [DOWN] or [UP] to change the contrast from 0 (lowest) to 10
(highest).
4. Press [MODE] to exit.
3.10 Dive history
Suunto DX has a detailed logbook and dive history available in
memory mode.
The logbook contains a sophisticated dive profile for each recorded
dive. The time between each data point saved in the log is based on
The dive history is a summary of all recorded dives.
To access dive history:
1. Press [MODE] until you come see MEM.
2. Switch between History and Logbook with [DOWN] or [UP].
3. When you are viewing the history or logbook, you can press
[MODE] to go back and select the other one. Press [MODE] a
second time to exit.
History
Scuba dive history shows you a summary of the following:
•
•
•
Dive hours
Total number of dives
Maximum depth
The scuba dive history records a maximum of 999 dives and 999
diving hours. When these limits are reached, the counters reset to
zero.
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Logbook
To access the logbook:
1. Press [MODE] three time until you come to MEM mode.
2. Press [UP] to select Logbook.
3. Press [DOWN] or [UP] to scroll to the log you wish to look at and
press [SELECT].
4. Press [SELECT] to scroll through the pages.
5. Press [MODE] to exit.
Each log has three pages:
1. Main page
•
•
•
maximum depth
date of dive
type of dive (indicated by first letter of dive mode, e.g. G for
GAUGE mode)
•
•
•
•
dive start time
dive number – from oldest to newest
gas percentage(s) of the first used gas mix
total dive time (in minutes in all modes)
2. Surface time and warnings page
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•
•
•
•
•
•
maximum depth
surface time after previous dive
average depth
consumed pressure (if enabled)
warnings
OLF% (if applicable)
3. Dive profile graph
•
•
•
•
•
water temperature
tank pressure (if enabled)
gas changes
setpoint changes
depth/time profile of the dive
Press [UP] to step through the dive profile graph or keep [UP]
pressed to auto-scroll.
The dive profile graph shows point by point dive information such
as depth, compass heading, decompression info, ceiling and ascent
time.
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The End of Logs text is displayed between the oldest and most
recent dive.
The logbook capacity depends on the sample rate. A more frequent
sample rate consumes more memory.
If the memory is full, when new dives are added, the oldest dives
are deleted.
The contents of the memory remain when the battery is changed
(providing that the battery has been replaced according to the
instructions).
NOTE: Several repetitive dives are considered to belong to the
same repetitive dive series if the no-fly time has not ended. See
3.11 Dive modes
Suunto DX has the following dive modes:
•
•
Air: for diving with regular air
Mixed: for diving using oxygen-enriched and helium gas
mixtures
•
•
•
CCR: for rebreather diving
Gauge: for using the dive computer as a bottom timer
Off: turns dive mode off completely; the dive computer does not
automatically switch the dive mode when submerged and dive
planning mode is hidden
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By default, Air mode is activated when you enter dive mode. You
can change which mode is activated or turn dive mode off under
the general settings.
To change dive modes:
1. While in time mode, keep [DOWN] pressed.
2. Press [SELECT] to enter Dive Mode.
3. Change to the desired mode with [UP] or [DOWN] and confirm
with [SELECT].
4. Press [MODE] to exit.
Each dive mode has its own settings which you need to adjust while
in the given mode.
To modify dive mode settings:
1. While in a given dive mode, keep [DOWN] pressed.
2. Press [DOWN] or [UP] to scroll through the settings.
3. Press [SELECT] to enter a setting.
4. Adjust the setting with [DOWN] or [Up] and confirm with
[SELECT].
5. Press [MODE] to exit.
NOTE: Some settings cannot be changed until five (5) minutes
have elapsed after the dive.
3.11.1 Air mode
Air mode is for diving with regular air and has the following
settings:
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•
Personal/altitude adjustment (see 3.16 Personal and altitude
•
•
•
•
•
•
•
3.11.2 Mixed mode
Suunto DX has a mixed dive mode for diving with oxygen and/or
helium mixture in an open system.
MIXED mode has the following settings available:
•
•
Gases
Personal/altitude adjustment (see 3.16 Personal and altitude
•
•
•
•
•
•
In mixed mode, the default setting is standard air (21% O and 0%
2
He), and oxygen partial pressure (PO ) is 1.4 bar (20 psi).
2
The default setting for maximum oxygen partial pressure is 1.4 bar
(20 psi). Valid values are 0.5-1.6 bar (7-23 psi).
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Changing gases
When more than one gas mix is defined, you can change between
the defined mixes during a Nitrox dive. When the maximum
operating depth allows for a gas change, the dive computer
prompts you to change the gas. When PO permits a better
2
decompression gas to be used, the dive computer prompts it
automatically if it is set as primary.
A dive is always started with Mix1. During the dive, you change to
another mix if it is within the set maximum oxygen partial pressure.
The tissue calculation during the dive is based on the mixes you
have selected as primary gases.
To change gases during a dive:
1. Keep [UP] pressed.
2. Scroll through the gas mixes with [UP] or [DOWN].
3. When the mix you desire is displayed, change to that mix by
pressing [SELECT].
NOTE: It is only possible to change to another gas mix if the gas
is within the set maximum oxygen partial pressure limit. If the set
PO limit is exceeded, the PO value for the mix blinks. The mix is
2
2
shown, but you cannot select it.
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NOTE: If no button is pressed in 15 seconds, the dive computer
will go back to the dive display without changing the gas mix. Upon
ascent, the computer prompts you to change gas when the PO
2
level you have set for the next mix allows a gas change. The prompt
is a low priority alarm followed by the "Change gas" beep, sounded
once. The Gas mix (O %He) value blinks.
2
3.11.3 CCR mode
CCR mode is a dive mode dedicated to rebreather diving.
The CCR mode has the following settings:
•
•
•
•
Personal/altitude adjustment (see 3.16 Personal and altitude
•
•
•
•
•
In CCR mode you can define up to three diluent gases and up to
eight bailout gas mixes. Use the setpoint settings to define your
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3.11.3.1 Closed-circuit gases
On a rebreather dive, you need at minimum two closed-circuit
gases: one is your pure oxygen tank, and the other is a diluent.
The correct oxygen and helium percentages of the diluent gas(es) in
your diluent cylinder(s) must always be entered into the dive
computer (or through DM5) to ensure correct tissue and oxygen
calculation. Diluent gas(es) used on a rebreather dive are found
under CC gases in the main menu.
To modify diluent gases
1. While in CCR mode, keep [DOWN] pressed to enter settings.
2. Press [SELECT] to enter CC Gases settings.
3. DILUENT 1 is displayed and is always on (cannot be turned off).
4. Press [SELECT] to move to the oxygen setting.
5. Adjust oxygen percentage with [DOWN] or [UP] and confirm
with [SELECT].
6. Continue with adjusting helium percentage and PO value.
2
7. After pressing [SELECT] to confirm the PO value, press [UP] to
2
move to the next diluent.
8. Repeat steps 4 and 5 for each diluent.
9. Press [MODE] to exit.
3.11.3.2 Open-circuit gases
As with closed-circuit gases, you must alway define the correct
oxygen and helium percentages of open-circuit gases (bailout gases)
to ensure correct tissue and oxygen calculation.
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Follow the same procedure as the CC gases to define your open-
circuit gases under the OC Gases settings.
After entering values for Mix1, you can create additional
mixes,Mix2 to Mix8. Each additional mix can be primary, secondary,
or off. Mix1 is always set as a primary gas.
To minimize the risk of error during a dive, it is highly
recommended that the mixes are set in the proper order. This
means that as the mix number rises, so does oxygen content. This is
the order they are usually used during the dive. Before a dive, only
enable the mixes you actually have available and remember to
check the set values to ensure they are correct.
The ascent time is calculated based on the assumption that you start
the ascent profile immediately and all the primary gases are
changed as soon as their maximum operating depth allows it. That
is, using the gases that are set as primary, the most optimal ascent
schedule for the moment is calculated.
To see the most pessimistic ascent schedule, that is, a schedule for
the situation when gases are not changed at all, you can set the
gases as secondary and the time it takes to finish the decompression
using the current breathing gas is shown as the ascent time.
Showing the most pessimistic ascent schedule during a long dive
may result in the ascent time no longer fitting the reserved field,
and the dive watch displays '----'.
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NOTE: While setting the gases, notice that the calculated
maximum operating depth is displayed in the upper field. You
cannot change to this gas before you have ascended above this
depth.
3.11.3.3 Setpoints
In CCR mode there are two setpoint values that you can set, low
and high. Typically you do not need to modify the default setpoint
values. However, you can change them as needed either in DM5 or
under the CCR mode settings.
•
•
Low set point: 0.4 – 0.9 (default: 0.7)
High set point: 1.0 – 1.6 (default: 1.3)
To change set point values:
1. While in CCR mode, keep [DOWN] pressed.
2. Press [UP] to scroll to SETPOINT and press [SELECT].
3. Press [DOWN] or [UP] to choose LOW SETPOINT and press
[SELECT].
4. Press [DOWN] or [UP] to set value for PO and accept with
2
[SELECT].
5. Repeat steps 2-4 for HIGH SETPOINT if necessary.
6. Press [MODE] to exit.
Setpoint switching
You can use automatic or manual setpoint switching. The automatic
low setpoint switch depth is 4.5 m (15 ft) by default, and the high
setpoint switch depth is 21 m (70 ft).
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The auto setpoint switching is off by default for the low setpoint
and on for the high setpoint.
To modify setpoint switching:
1. While in CCR mode, keep [DOWN] pressed.
2. Press [UP] to scroll to SWITCH HIGH and press [SELECT].
3. Press [DOWN] or [UP] to to toggle On/Off and press [SELECT].
4. Press [DOWN] or [UP] to set value for for SWITCH HIGH in meters
(m).
5. Press [SELECT] to save
6. Repeat steps 2-4 for SWITCH LOW if necessary.
7. Press [MODE] to exit.
Modify setpoints during a dive
The high and low setpoints or a custom (manual) set point can be
adjusted during a dive.
To modify setpoints during a dive:
1. While in CCR mode, keep [UP] pressed.
2. Scroll to the setpoint you want to adjust with [UP] or [DOWN].
3. Press [SELECT] to enter the setting.
4. Press [DOWN] or [UP] to adjust value.
5. Press [SELECT] to save.
6. Press [MODE] to exit.
3.11.3.4 Changing gases
In CCR dive mode, Suunto DX allows both setpoint and gas changes
to enabled gas mixes during the dive.
To adjust the diluent during a dive:
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1. Keep [UP] pressed.
2. Scroll through the settings with [UP] or [DOWN] to access the CC
Diluent setting and press [SELECT].
3. Scroll through the diluent list with [UP] or [DOWN] and press
[SELECT] to select a Diluent.
Enabled open-circuit gas changes are made in the same way and at
the same time the as CC dive changes to an open-circuit (OC) dive.
This feature is useful in bail-out situation.
Hyperoxic and hypoxic mixes
Suunto DX displays the text HYPER if the diluent gas PO at the
2
current depth is over 1.6. The text HYPOX is displayed if the diluent
gas PO at the current depth is less than 0.18.
2
3.11.4 Gauge mode
With Gauge mode, you can use Suunto DX as a bottom timer.
The timer in the center of the display shows dive time in minutes
and seconds and activates at the start of the dive. The total running
dive time, in minutes, is in the lower right corner.
The timer in the center of the display can be used as a stopwatch by
pressing [SELECT] during the dive.
Pressing [SELECT] resets the main timer and adds a bookmark to the
dive log. The previously-timed interval is displayed below the main
timer.
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Bookmark
1 stored
0'10
3'55
3'55
0'00
Gauge mode has the following settings
•
•
•
Gauge mode is a bottom timer only and thus includes no
decompression information or calculations.
3.12 Dive planning mode
The dive planning mode PLAN NoDeco can be used to plan a dive
that does not require decompression. You enter the depth of your
upcoming dive, and Suunto DX calculates the maximum time you
can stay at that depth without requiring decompression stops.
The dive plan takes into account:
•
•
any calculated residual nitrogen
dive history from the past four days
To plan dives:
1. Press [MODE] until you see PLAN NODEC.
2. The display briefly shows your remaining desaturation time
before continuing to the planning display.
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3. Press [DOWN] or [UP] to scroll your upcoming dive depths. The
depth moves in 3 m (10 ft) increments from 9 m – 45 m (30 ft –
150 ft). The no-decompression time limit for the selected depth
is shown in the center of the display.
If you have dived at least once with Suunto DX, the SURFTIME +
field appears. You can adjust the surface time with [UP].
4. Between consecutive dives, you can press [SELECT] to adjust
surface time.
5. Press [MODE] to exit.
NOTE: The dive planning mode is disabled if the dive computer
dive mode is off or in Gauge mode.
3.13 Dive time alarm
The dive time alarm can be activated and used for several purposes
to add to your diving safety. It is simply a countdown timer in
minutes.
To set the dive time alarm:
1. While in a relevant dive mode, keep [DOWN] pressed.
2. Press [DOWN] or [UP] to scroll to ALARM TIME.
3. Press [UP] to toggle the alarm on and press [SELECT] to confirm.
4. Adjust the duration with [UP] or [DOWN] and accept with
[SELECT].
5. Press [MODE] to exit.
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3.14 Error state (algorithm lock)
Suunto DX has warning indicators that alert you to react to certain
situations that would significantly increase the risk of DCI. If you do
not respond to these warnings, Suunto DX enters an error state and
shows Er on the display. This indicates that the risk of DCI has
greatly increased.
If you omit decompression stops for longer than three (3) minutes,
the RGBM algorithm is locked for 48 hours. When the algorithm is
locked, no algorithm information is available and ER is shown
instead. Locking the algorithm is a safety feature, highlighting that
the algorithm information is no longer valid.
In such a condition, you should descend back below the ceiling level
to continue the decompression. If you fail to do so within three (3)
minutes, Suunto DX locks the algorithm calculation and displays ER
instead, as shown below. Note that the ceiling value is no longer
present.
In this state, you significantly increase your risk of decompression
sickness (DCS). Decompression information is not available for the
next 48 hours after surfacing.
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It is possible to dive with the device when the algorithm is locked,
but instead of the decompression information, ER is shown.
If you dive again in this error state, the algorithm lock time resets to
48 hours when you surface.
3.15 Oxygen calculations
During a dive, Suunto DX calculates partial pressure of oxygen
(PO ), central nervous system toxicity (CNS%) and pulmonary
2
oxygen toxicity, tracked by OTU (oxygen toxicity units).
The oxygen calculations are based on currently accepted exposure
time limit tables and principles.
When the dive computer is set in MIXED mode, the DIVE PLANNING
mode calculates using the O % and P O values that are currently
2
2
in the computer.
Oxygen related information displayed by the dive computer is also
designed to ensure that all warnings and displays occur at the
appropriate phases of a dive. For example, the following
information will be shown before and during a dive when the
computer is set in MIXED mode:
•
The selected O % on the alternative display
2
•
OLF% alternative display for either CNS% or OTU% (whichever
is larger)
•
•
Audible alarms are given and the OLF value starts to blink when
the 80% and 100% limits are exceeded.
Audible alarms are given and the actual PO value blinks when
2
it exceeds the preset limit.
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•
In dive planning, the maximum depth according to the O % and
2
maximum PO selected
2
3.16 Personal and altitude adjustments
There are several factors that can affect your susceptibility to DCS.
Such factors vary between divers and from one day to another.
The personal factors which tend to increase the possibility of DCS
include:
•
•
•
•
•
•
•
•
exposure to cold water - less than 20°C (68 °F)
below average physical fitness level
fatigue
dehydration
stress
obesity
patent foramen ovale (PFO)
exercise before or after dive
The three-step personal setting can be used to adjust the algorithm
to fit your DCS susceptibility.
Personal adjustment
Explanation
0
Ideal conditions (default value).
Conservative. Some risk factors or
conditions exist.
1
2
More conservative. Several risk factors
or conditions exist.
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In addition to the personal setting, Suunto DX can be adjusted for
diving at different altitudes. This adjusts the decompression
calculation according to the selected altitude adjustment.
Altitude adjustment
Explanation
0
1
2
0 – 300 m (0 – 980 ft) (default)
300 – 1500 m (980 – 4900 ft)
1500 – 3000 m (4900 – 9800 ft)
To change the personal and altitude adjustment settings:
1. While in a dive mode, keep [DOWN] pressed.
2. Press [SELECT] to enter Personal Altitude settings.
3. Press [UP] to change the Personal adjustment and confirm with
[SELECT].
4. Press [UP] to change the Altitude adjustment and confirm with
[SELECT].
5. Press [MODE] to exit.
WARNING: Traveling to a higher altitude can temporarily cause
changes to the equilibrium of dissolved nitrogen in the body. It is
recommended that you acclimatize to the new altitude by waiting
at least three (3) hours before diving.
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3.17 Rebreather diving
Suunto DX has one mode dedicated to rebreather diving, CCR
mode. This mode uses fixed high/low setpoint values which you can
modify in the watch or through DM5.
Fixed setpoint calculation enables Suunto DX to be used as a
backup dive computer on rebreather dives. It does not control or
monitor the rebreather unit in any way.
split into two: CC gases (closed-circuit gases) and OC gases (open-
circuit gases).
NOTE: For rebreather dives, Suunto DX should be used as a
backup device only. The primary control and monitoring of your
gases should be done through the rebreather itself.
3.18 Sample rate
The sample rate controls how often information from the dive is
saved to the active log. The sample rate options are: 10, 20, 30 and
60 seconds. The default sample rate is 20 seconds.
To change the sample rate:
1. While in a dive mode, keep [DOWN] pressed.
2. Press [UP] to scroll to Sample Rate and press [SELECT].
3. Press [DOWN] or [UP] to change the rate and confirm with
[SELECT].
4. Press MODE to exit.
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3.19 Safety stops and deepstops
Safety stops are widely considered good diving practice and are a
critical part of most dive tables. The reasons for performing a safety
stop include: reducing sub-clinical DCI, microbubble reduction,
ascent control, and orientation before surfacing.
Suunto DX displays two different types of safety stops:
recommended and mandatory.
With every dive over 10 meters (30 feet), there is a three-minute
countdown for the recommended safety stop. This stop is taken in
the 3-6 m (10-20 ft) range. Suunto DX shows a STOP icon and a
three-minute countdown.
NOTE: When deepstops are enabled, the length of mandatory
safety stops is indicated in seconds.
When the ascent rate exceeds 10 m (33 ft) per minute for more than
five consecutive seconds, the microbubble build-up may be more
than is allowed for in the decompression model.
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In this situation, Suunto DX adds a mandatory safety stop to the
dive. The time of this stop depends on the speed violation of the
ascent rate.
The STOP icon is shown in the display. When you reach the depth
zone between 6 m and 3 m (18 ft and 9 ft) the following is
displayed:
1. CEILING and STOP
2. Ceiling depth
3. Safety stop time
Wait at the ceiling until the mandatory safety stop warning
disappears.
WARNING: NEVER ASCEND ABOVE THE CEILING! You must not
ascend above the ceiling during your decompression. In order to
avoid doing so by accident, you should stay somewhat below the
ceiling.
Deepstops activate when you dive deeper than 20 m (65.6 ft).
If the dive timer is on the screen when deepstop activates, the timer
is replaced with deepstop.
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After deepstop is over, the user can change between deepstop and
the timer by long pressing the MODE button.
Deepstops are presented the same way as safety stops. Suunto DX
notifies you that you are in the deepstop area by displaying:
•
•
•
•
CEILING in the top
DEEPSTOP in the center row
Stop depth
Countdown timer
Deepstop is on by default in Air and Nitrox modes. To turn
deepstop off:
1. While in a dive mode, keep [DOWN] pressed.
2. Press [DOWN] to scroll to Deepstop and enter with [Select].
3. Press [UP] to toggle on/off.
4. Press [MODE] to exit.
3.20 Software version
You can check the software version and battery status of Suunto DX
under the general settings.
1. While in time mode, keep [DOWN] pressed.
2. Press [UP] to scroll to Version and press [SELECT].
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3. The software version is displayed along with the battery voltage.
3.21 Stopwatch
The stopwatch can be used to measure elapsed and split times.
To activate the stopwatch:
1. While in time mode, scroll through the bottom row view by
pressing [UP] or [DOWN] until the stopwatch is displayed.
2. Press [SELECT] to start/stop the stopwatch.
3. Press [DOWN] to take split times.
4. Keep [SELECT] pressed to reset the stopwatch.
After stopping the stopwatch, you can scroll through the split times
with [DOWN].
You can also use the stopwatch while diving for various timing
purposes. To activate the stopwatch in dive mode, keep [MODE]
pressed.
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Start and stop the stopwatch by pressing [SELECT].
NOTE: If a deepstop activates while you are using the
stopwatch, the timer field is not visible.
3.22 Surface and no-fly time
Once back at the surface, Suunto DX continues to provide post-dive
safety information and alarms. If, after your dive, you need to wait
until flying, the no-fly symbol displays in all modes.
To access further information about your surface and no-fly times,
enter dive mode.
Suunto DX shows the time since you surfaced in the Surf t. field.
The airplane symbol indicates that you should not fly. The
countdown until you will be safe to fly is shown in the No Fly field.
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No-fly time is always at least 12 hours and equals desaturation time
when it is more than 12 hours. For desaturation times shorter than
70 minutes, the no-fly time is not displayed.
If decompression is omitted during a dive so that Suunto DX enters
always 48 hours.
If a dive is done in Gauge mode (bottom timer), the no-fly time is 48
hours.
WARNING: YOU ARE ADVISED TO AVOID FLYING ANY TIME THE
COMPUTER COUNTS DOWN THE NO-FLY TIME. ALWAYS ACTIVATE
THE COMPUTER TO CHECK THE REMAINING NO-FLY TIME PRIOR TO
FLYING! Flying or traveling to a higher altitude within the no-fly
time can greatly increase the risk of DCS. Review the
recommendations given by Divers Alert Network (DAN). There can
never be a flying-after-diving rule that is guaranteed to completely
prevent decompression sickness!
The Divers Alert Network (DAN) recommends the following on no-
fly times:
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•
•
A minimum surface interval of 12 hours would be required in
order to be reasonably assured a diver will remain symptom free
upon ascent to altitude in a commercial jetliner (altitude up to
2,400 m (8,000 ft)).
Divers who plan to make daily, multiple dives for several days, or
make dives that require decompression stops, should take special
precautions and wait for an extended interval beyond 12 hours
before a flight. Further, the Undersea and Hyperbaric Medical
Society (UHMS) suggests divers using standard air cylinders and
exhibiting no symptoms of decompression sickness wait 24 hours
after their last dive to fly in an aircraft with cabin pressure up to
2,400 m (8,000 ft). The only two exceptions to this
recommendation are:
•
If a diver has less than two (2) hours total accumulated dive
time in the last 48 hours, a 12 hour surface interval before
flying is recommended.
•
Following any dive that required a decompression stop, flying
should be delayed for at least 24 hours, and if possible, for 48
hours.
Suunto recommends that flying is avoided until all the DAN and
UHMS guidelines, as well as the dive computer’s no-fly conditions,
are satisfied.
3.22.1 Dive numbering
If the Suunto DX has not counted the no-fly time down to zero,
then repetitive dives belong to the same dive series.
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Within each series, the dives are given numbers. The first dive of the
series is DIVE 1, the second DIVE 2, and so on.
If you start a new dive with less than five (5) minutes at the surface,
Suunto DX treats the new dive as part of the previous dive. The dive
time continues where it left off.
After five (5) minutes or more at the surface, any new dives are part
of a repetitive dive series. The dive counter displayed in the
planning mode adds one to each new dive in the repetitive series.
The planning mode allows you to review the no-decompression
limits on the next dive in a series.
3.23 Suunto Fused RGBM
Suunto's decompression model development originates from the
1980s when Suunto implemented Bühlmann's model based on M-
values in Suunto SME. Since then research and development has
been ongoing with the help of both external and internal experts.
In the late 1990s, Suunto implemented Dr. Bruce Wienke's RGBM
(Reduced Gradient Bubble Model) bubble model to work with the
earlier M-value based model. The first commercial products with the
feature were the iconic Suunto Vyper and Suunto Stinger. With
these products the improvement of diver safety was significant as
they addressed a number of diving circumstances outside the range
of dissolved-gas-only models by:
•
•
•
Monitoring continuous multiday diving
Computing closely spaced repetitive diving
Reacting to a dive deeper than the previous dive
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•
•
Adapting to rapid ascents which produce high microbubble
(silent-bubble) build-up
Incorporating consistency with real physical laws for gas kinetics
In Suunto Fused™ RGBM the tissue half-times are derived from
Wienke’s FullRGBM where human body is modeled by fifteen
different tissue groups. FullRGBM can utilize these additional tissues
and model the on-gassing and off-gassing more accurately. The
amounts of nitrogen and helium on-gassing and off-gassing in the
tissues are calculated independently from each other.
The advantage of Suunto Fused RGBM is additional safety through
its ability to adapt to a wide variety of situations. For recreational
divers it may offer slightly longer no- deco times, depending on the
chosen personal setting. For open-circuit technical divers it allows
use of gas mixes with helium - on deeper and longer dives helium
based gas mixes provide shorter ascent times. And finally, for
rebreather divers the Suunto Fused RGBM algorithm gives the
perfect tool to be used as a non-monitoring, set point dive
computer.
3.24 Diver Safety
Because any decompression model is purely theoretical and does
not monitor the actual body of a diver, no decompression model
can guarantee the absence of DCS. Experimentally it has been
shown that the body adapts to decompression to some degree
when diving is constant and frequent. Personal adjustment settings
are available for divers who dive constantly and are ready to accept
greater personal risk.
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CAUTION: Always use the same personal and altitude
adjustment settings for the actual dive and for the planning.
Increasing the personal adjustment setting from the planned
setting as well as increasing the altitude adjustment setting can
lead to longer decompression times deeper and thus to larger
required gas volume. You can run out of breathing gas underwater
if the personal adjustment setting has been changed after dive
planning.
3.24.1 Altitude diving
The atmospheric pressure is lower at high altitudes than at sea
level. After traveling to a higher altitude, you will have additional
nitrogen in your body, compared to the equilibrium situation at the
original altitude. This 'additional' nitrogen is released gradually
over time and equilibrium is restored. It is recommended that you
acclimatize to a new altitude by waiting at least three hours before
making a dive.
Before high-altitude diving, you need to adjust the altitude settings
of your dive computer so that the calculations take into account the
high altitude. The maximum partial pressures of nitrogen allowed
by the mathematical model of the dive computer are reduced
according to the lower ambient pressure.
As a result, the allowed no decompression stop limits are
considerably reduced.
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WARNING: SET THE CORRECT ALTITUDE SETTING! When diving
at altitudes greater than 300 m (1000 ft), the altitude setting must
be correctly selected in order for the computer to calculate the
decompression status. The dive computer is not intended for use at
altitudes greater than 3000 m (10000 ft). Failure to select the
correct altitude setting or diving above the maximum altitude limit
will result in erroneous dive and planning data.
3.24.2 Oxygen exposure
The oxygen exposure calculations are based on currently accepted
exposure time limit tables and principles.
The dive computer calculates separately the Central Nervous System
oxygen toxicity (CNS) and the Pulmonary Oxygen toxicity, the latter
measured by the addition of Oxygen Toxicity Units (OTU).
Both fractions are scaled so that the diver’s maximum tolerated
exposure for each is 100%.
Suunto DX does not display CNS% or OTU% but instead displays the
larger of the two in the OLF% field. OLF% value is the Oxygen limit
fraction or Oxygen Toxicity Exposure.
For example, it the diver’s maximum tolerated exposure for CNS% is
85% and the maximum tolerated exposure for OUT% is 80% the
OLF% displays the largest scaled value, here 85%.
Oxygen related information displayed by the dive computer is also
designed to ensure that all warnings and displays occur at the
appropriate phases of a dive.
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WARNING: WHEN THE OXYGEN LIMIT FRACTION INDICATES
THAT THE MAXIMUM LIMIT IS REACHED, YOU MUST IMMEDIATELY
TAKE ACTION TO REDUCE OXYGEN EXPOSURE. Failure to take
action to reduce oxygen exposure after a CNS%/OTU warning is
given can rapidly increase the risk of oxygen toxicity, injury, or
death.
3.25 Tank pressure
When using the optional Suunto Wireless Transmitter, the pressure
of your tank is shown in the lower left of the display.
Whenever you start a dive, the remaining air time calculation
begins. After 30-60 seconds, the first estimation of remaining air
time is shown in the left center of the display.
The calculation is always based on the actual pressure drop in your
tank and automatically adapts to your tank size and current air
consumption.
The change in your air consumption is based on constant one
second interval pressure measurements over periods of 30–60
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seconds. An increase in air consumption decreases the remaining air
time rapidly, while a drop in air consumption increases the air time
slowly. In this way, an overly optimistic air time estimate, caused by
a temporary drop in air consumption, is avoided.
The remaining air time calculation includes a 35 bar (500 psi) safety
reserve. This means that when the instrument shows the air time to
be zero, there is still a small reserve.
NOTE: Filling your BCD affects the air time calculation due to
the temporary increase in air consumption.
The remaining air time is not displayed when either deepstops or
the decompression ceiling has been activated. You can check
remaining air time by keeping [DOWN] pressed.
Temperature changes affect the tank pressure and consequently the
air time calculation.
Low air pressure warnings
The dive computer warns you with two (2) audible double beeps
and a blinking pressure display when the tank pressure reaches 50
bar (700 psi).
Two (2) double beeps sound when the tank pressure reaches the
defined alarm pressure and when the remaining time reaches zero.
3.25.1 Wireless transmission
To enable wireless transmission of tank pressure data to Suunto DX
requires:
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1. Installation of Suunto Wireless Transmitter onto your regulator.
2. Pairing the transmitter to your Suunto DX.
3. Enabling the wireless integration in your Suunto DX settings.
The transmitter enters power saving mode with slower data
transmission rate if the tank pressure remains unchanged for more
than five (5) minutes.
The optional transmitter sends out a low battery (batt) warning
when its battery voltage is getting low. This is shown intermittently
instead of the pressure reading. When you get this warning, the
tank pressure transmitter's battery needs to be replaced.
3.25.2 Installing and pairing transmitter
When purchasing the Suunto Wireless Transmitter, we strongly
recommend that you have your Suunto representative attach the
transmitter to the first stage of your regulator.
The unit needs to be undergo a pressure test after installation and
typically this requires a trained technician.
In order to receive wireless data, the transmitter and the Suunto DX
need to be paired.
The wireless transmitter activates when the tank pressure exceeds
15 bar (300 psi). The transmitter then starts sending pressure data
together with a code number.
When your Suunto DX is within 0.3 m (1 ft) of the transmitter, it
receives and stores that code. The transmitter and Suunto DX are
now paired. Suunto DX will then display the pressure data it
receives with this code. This coding procedure prevents data mix-up
from other divers also using a Suunto Wireless Transmitter.
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NOTE: The pairing procedure normally only needs to be done
once. You may need to redo the pairing procedure if another diver
in your group uses the same code.
To assign a new transmitter code:
1. Slowly open the tank valve fully to pressurize the system.
2. Immediately close the tank valve.
3. Quickly depressurize the regulator so that the pressure is
reduced to less than 10 bar (145 psi).
4. Wait about 10 seconds, and slowly open the tank valve again to
re-pressurize above 15 bar (300 psi).
The transmitter assigns a new code automatically. To re-pair the
transmitter with your Suunto DX:
1. While in a dive mode other than Free or Gauge, keep [DOWN]
pressed to enter the settings.
2. Press [DOWN] to scroll to Tank Press Pairing and press SELECT.
3. Make sure TANK PRESS PAIRING is set to ON and press [SELECT].
4. A code number is displayed. Press [UP] to clear the code.
5. Press [SELECT].
6. Press [MODE] to exit.
With the system pressurized to above 15 bar (300 psi), bring your
Suunto DX close to the transmitter. When pairing is completed, the
dive computer displays the new code number and the transmitted
tank pressure.
The wireless transmitter indicator is displayed every time a valid
signal is received.
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3.25.3 Transmitted data
After pairing, your Suunto DX receives tank pressure data from the
transmitter.
Any time the Suunto DX receives a signal, one of the following
symbols is shown in the lower left corner of the display.
Display
Cd:--
Indication
No code stored, the dive computer is ready
for pairing with the transmitter.
Current code number. Code number can be
from 01 to 40.
Cd:10
- - -
The flash symbol is blinking. Pressure
reading exceeds allowed limit (over 360 bar
(5220 psi)).
no conn
Text no conn is displayed when the unit
receives no data from the transmitter.
The pressure reading has not been updated
for over a minute. The last received
pressure blinks on and off. The flash
symbol is not displayed.
This state may be caused by the :
1. Transmitter being out of range (>1.2 m
(4 ft))
2. Transmitter is in power saving mode
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Display
batt
Indication
3. Transmitter is on another channel. To
correct this:
Pressure transmitter battery voltage is low.
Change the transmitter battery!
3.25.4 Tank pressure alarm
There are two tank pressure alarms. The first is fixed at 50 bar (700
psi) and cannot be changed.
The second is user configurable. It can be turned on or off and can
be used for a pressure range of 10–200 bar (200-3000 psi).
To set the tank pressure alarm value:
1. While in a dive mode, keep [DOWN] pressed to enter settings.
2. Press [DOWN] to scroll to Tank Press Alarm and press [SELECT].
3. Press [UP] to turn the alarm on and confirm with [SELECT].
4. Adjust the pressure level with [UP] or [DOWN] and confirm with
[SELECT].
5. Press [MODE] to exit.
3.25.5 Air time
Air time can only be displayed when a wireless tank pressure
transmitter is installed and in use.
To activate air time:
1. While in a dive mode, keep [DOWN] pressed.
2. Press [DOWN] to scroll to Air Time.
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3. Press [UP] to turn on the air time reading.
4. Press [SELECT].
5. Press [MODE] to exit.
3.26 Tones
Device tones can be turned on or off. When tones are off, there are
no audible alarms.
To set tones:
1. While in time mode, keep [DOWN] pressed.
2. Press [DOWN] or [UP] to scroll to Tones and press [SELECT].
3. Press [DOWN] or [UP] to toggle on/off and confirm with
[SELECT].
4. Press [MODE] to exit.
3.27 Water contact
The water contact is located on the side of the case. When
submerged, the water contact poles are connected by the
conductivity of the water. Suunto DX switches to dive state when
water is detected and the depth gauge senses water pressure at 1.2
m (4 ft).
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AC
The AC is shown until the water contact deactivates. It is important
to keep the water contact area clean. Contamination or dirt can
prevent automatic activation/deactivation. See 4.1 Handling
NOTE: Moisture build-up around the water contact may cause
the dive mode to activate. This can happen, for example, when
washing your hands or sweating. To save battery power, deactivate
the water contact by cleaning it and/or drying it with a soft towel.
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4 CARE AND SUPPORT
4.1 Handling guidelines
The Suunto DX dive computer is a sophisticated precision
instrument. Although it is designed to withstand the rigors of
diving, you must treat it with the same proper care and caution as
any other precision instrument.
Handle the unit with care – do not knock or drop it.
Do not fasten the strap of your dive computer too tightly. You
should be able to insert your finger between the strap and your
wrist.
After use, rinse it with fresh water, mild soap, and carefully clean
the housing with a moist soft cloth or chamois.
Use only original Suunto accessories - damage caused by non-
original accessories is not covered by warranty.
Keep the water contact and depth sensors areas on the sides of the
watch clean using fresh water and a soft brush, such as a
toothbrush.
Never try to open the case of the dive computer. Have your Suunto
DX serviced every two years or after 200 dives (whichever comes
first) by an authorized Suunto service center.
This service includes a general operational check, replacement of
the battery, and water resistance check. The service requires special
tools and training. Do not attempt to do any servicing yourself.
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Should moisture appear inside the case or battery compartment,
immediately have the instrument checked by your Suunto service
center.
The optional scratch guard for Suunto DX is designed to help
prevent the display from getting scratched. Scratch guards can be
purchased separately from your authorized Suunto dealer.
Should you detect scratches, cracks or other such flaws on the
display that may impair its durability, immediately contact your
authorized Suunto dealer.
Protect the unit from shock, extreme heat, direct sunlight, and
chemicals.
Store your dive computer in a dry place when you are not using it.
4.2 Water resistance
Suunto DX is water resistant to 200 meters (656 ft) in compliance
with the dive watch standard ISO 6425.
WARNING: Water resistance is not equivalent to maximum
operating depth. The maximum operating depth of this dive
computer is 150 meters (492 ft).
To maintain water resistance, it is recommended to:
•
•
never use the device for other than intended use.
contact an authorized Suunto service center, distributor or
retailer for any repairs.
•
•
keep the device clean from dirt and sand.
never attempt to open the case yourself.
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•
•
•
avoid subjecting the device to rapid air and water temperature
changes.
always clean your device with fresh water if subjected to salt
water.
never knock or drop the device.
4.3 Battery replacement
Suunto DX displays a battery symbol as a warning when the power
gets too low. When this happens, your Suunto DX should not be
used for diving until the battery has been replaced.
Contact an authorized Suunto service center for battery
replacement. It is imperative that the change is made in a proper
manner to avoid any leakage of water into the battery
compartment or computer.
Defects caused by improper battery installation are not covered by
the warranty.
All history and logbook data, as well as the altitude, personal and
alarm settings, remain in the dive computer memory after the
battery change. Other settings revert back to default values.
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5 REFERENCE
5.1 Technical specifications
Dimensions and weight
•
•
•
•
Length: 49 mm (1.94 in)
Width: 49 mm (1.94 in)
Height: 17 mm (0.68 in)
Weight: 107 g (3.77 oz) (with elastomer bracelet), 182 g (42 oz)
(with titanium bracelet)
Operating Instructions
•
•
Water resistance: 200 m (656 ft) (complying with ISO 6425)
Normal altitude range: 0 to 3,000 m (0 to 10,000 ft) above sea
level
•
•
•
Operating temperature: 0 °C to 40 °C (32 °F to 104 °F)
Storage temperature: -20 °C to +50 °C (-4 °F to +122 °F)
Maintenance cycle: 200 hours of diving or two years, whichever
comes first
Depth gauge
•
•
•
•
Temperature compensated pressure sensor
Accurate to 150 m (482 ft) complying with EN 13319
Depth display range: 0 to 300 m (0 to 984 ft)
Resolution: 0.1 m from 0 to 100 m (1 ft from 0 to 328 ft)
Temperature display
•
•
Resolution: 1 °
Display range: -20 °C to +50 °C (-4 °F to +122 °F)
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•
Accuracy: 2 °C ( 3.6 °F) within 20 minutes of temperature
change
Mixed mode
•
•
•
•
•
Helium: 0–95%
Oxygen: 5–99%
Partial pressure of oxygen (pO2): 0.2 – 3.0
Oxygen Limit Fraction: 0–200% with 1% resolution
Gas mixtures: up to 8
CCR mode
•
•
•
•
•
•
Helium %: 0–95
Oxygen %: 5–99
Partial pressure of oxygen (pO2): 0.2 – 3.0
Oxygen Limit Fraction: 0–200% with 1% resolution
CC gases: up to 3
OC gases: up to 8
Other displays
•
•
•
•
•
•
Dive time: 0 to 999 min
Surface time: 0 to 99 h 59 min
Dive counter: 0 to 99 for repetitive dives
No-decompression time: 0 to 99 min (-- after 99)
Ascent time: 0 to 999 min (-- after 999)
Ceiling depths: 3.0 to 150 m (10 to 492 ft)
Calendar clock
•
•
Accuracy: 25 s/month (at 20°C/68°F)
12/24 h display
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Compass
•
•
•
•
Accuracy: +/- 15°
Resolution: 1°
Max. tilt: 45 degrees
Balance: global
Timer
•
•
•
Accuracy: 1 second
Display range: 0’00 – 99’59
Resolution: 1 second
Logbook
•
•
Sample rate in air and mixed modes: default 20 seconds
Memory capacity: approximately 140 hours with 20-second
recording interval and without transmitter data.
Tissue calculation model
•
•
Suunto Fused RGBM
Maximum depth of operation: 150 m (492 ft)
5.2 Compliance
5.2.1 CE
Suunto Oy hereby declares that this product is in compliance with
the essential requirements and other relevant provisions of
Directive 1999/5/EC.
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5.2.2 EN 13319
EN 13319 is a European diving depth gauge standard. Suunto dive
computers are designed to comply with this standard.
5.2.3 EN 250 and FIOH
The tank pressure gauge and dive instrument parts used in
measuring the tank pressure meet the requirements set in the
section of the European Standard EN 250 that concern tank pressure
measurements. FIOH, notified body no.0430, has EC type-examined
this type of personal protective equipment.
5.3 Trademark
Suunto DX, its logos, and other Suunto brand trademarks and made
names are registered or unregistered trademarks of Suunto Oy. All
rights are reserved.
5.4 Patent notice
This product is protected by pending patent applications and their
corresponding national rights: US 5,845,235, US 7,349,805, US
8,660,626, US 13/803,795, US 13/832,081. Additional patent
applications may be filed.
5.5 Warranty
SUUNTO LIMITED WARRANTY
Suunto warrants that during the Warranty Period Suunto or a
Suunto Authorized Service Center (hereinafter Service Center) will,
at its sole discretion, remedy defects in materials or workmanship
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free of charge either by a) repairing, or b) replacing, or c)
refunding, subject to the terms and conditions of this Limited
Warranty. This Limited Warranty is only valid and enforceable in the
country of purchase, unless local law stipulates otherwise.
Warranty Period
The Limited Warranty Period starts at the date of original retail
purchase. The Warranty Period is two (2) years for display devices.
The Warranty Period is one (1) year for accessories and consumable
parts, including but not limited to chargeable batteries, chargers,
docking stations, straps, cables and hoses.
Exclusions and Limitations
This Limited Warranty does not cover:
1. a) normal wear and tear, b) defects caused by rough handling, or
c) defects or damage caused by misuse contrary to intended or
recommended use;
2. user manuals or any third-party items;
3. defects or alleged defects caused by the use with any product,
accessory, software and/or service not manufactured or supplied
by Suunto;
This Limited Warranty is not enforceable if item:
1. has been opened beyond intended use;
2. has been repaired using unauthorized spare parts; modified or
repaired by unauthorized Service Center;
3. serial number has been removed, altered or made illegible in
any way, as determined at the sole discretion of Suunto;
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4. has been exposed to chemicals including but not limited to
mosquito repellents.
Suunto does not warrant that the operation of the Product will be
uninterrupted or error free, or that the Product will work with any
hardware or software provided by a third party.
Access to Suunto warranty service
You must have proof of purchase to access Suunto warranty service.
For instructions how to obtain warranty service, visit
comprehensive range of support materials is available there, or you
can post a question directly to Suunto Contact Center. Alternatively,
you may contact Suunto Contact Center at the phone number listed
on the last page of this document. Suunto’s qualified customer
support staff will help you and, if needed, troubleshoot your
product during the call.
Limitation of Liability
To the maximum extent permitted by applicable mandatory laws,
this Limited Warranty is your sole and exclusive remedy and is in
lieu of all other warranties, expressed or implied. Suunto shall not
be liable for special, incidental, punitive or consequential damages,
including but not limited to loss of anticipated benefits, loss of
data, loss of use, cost of capital, cost of any substitute equipment or
facilities, claims of third parties, damage to property resulting from
the purchase or use of the item or arising from breach of the
warranty, breach of contract, negligence, strict tort, or any legal or
equitable theory, even if Suunto knew of the likelihood of such
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damages. Suunto shall not be liable for delay in rendering warranty
service.
5.6 Copyright
Copyright © Suunto Oy. All rights reserved. Suunto, Suunto product
names, their logos and other Suunto brand trademarks and names
are registered or unregistered trademarks of Suunto Oy. This
document and its contents are proprietary to Suunto Oy and are
intended solely for the use of clients to obtain knowledge and
information regarding the operation of Suunto products. Its
contents shall not be used or distributed for any other purpose
and/or otherwise communicated, disclosed or reproduced without
the prior written consent of Suunto Oy. While we have taken great
care to ensure that information contained in this documentation is
both comprehensive and accurate, no warranty of accuracy is
expressed or implied. This document content is subject to change at
any time without notice. The latest version of this documentation
5.7 Terms
Term
What it means
A dive made at an elevation greater than 300 m
(1000 ft) above sea level.
Altitude dive
The speed at which the diver ascends toward the
surface.
Ascent rate
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Term
What it means
The minimum amount of time needed to reach
the surface on a decompression stop dive.
Ascent time
On a decompression stop dive, the shallowest
depth to which a diver may ascend based on
computed inert gas load.
Ceiling
Central nervous system toxicity. Toxicity is caused
by oxygen. Can cause a variety of neurological
symptoms. The most important of which is an
epileptic-like convulsion which can cause a diver
to drown.
CNS
CNS%
Central nervous system toxicity limit fraction.
Compartment See "Tissue group".
Suunto DM5 with Movescount, a software for
DM5
managing your dives.
Time spent at a decompression stop, or range,
Decompression before surfacing, to allow absorbed nitrogen to
escape naturally from tissues.
On a decompression stop dive, the depth range
Decompression
between the floor and the ceiling within which a
range
diver must stop for some time during ascent.
Decompression sickness/illness. Any of a variety
DCS
of maladies resulting either directly or indirectly
from the formation of nitrogen bubbles in tissues
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Term
What it means
or body fluids, as a result of inadequately
controlled decompression.
A group of repetitive dives between which the
dive computer indicates some nitrogen loading is
present. When nitrogen loading reaches zero the
dive computer deactivates.
Dive series
Dive time
Elapsed time between leaving the surface to
descend, and returning to the surface at the end
of a dive.
The deepest depth during a decompression stop
dive at which decompression takes place.
Floor
He%
Helium percentage or helium fraction in the
breathing gas.
Maximum operating depth of a breathing gas is
the depth at which the partial pressure of
MOD
oxygen (PO ) of the gas mix exceeds a safe limit.
2
A single or repetitive dive that includes time
spent at various depths and whose no
Multi level dive decompression limits are therefore not
determined solely by the maximum depth
attained.
In sports diving, refers to any mix with a higher
Nitrox (Nx)
fraction of oxygen than standard air.
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Term
What it means
No deco (No
decompression
stop time)
Any dive which permits a direct, uninterrupted
ascent to the surface at any time.
No dec time
OC
Abbreviation for no decompression time limit.
Open-circuit. Scuba that exhausts all exhaled gas.
Oxygen limit fraction. The diver’s current oxygen
toxicity exposure.
OLF%
Oxygen percentage or oxygen fraction in the
breathing gas. Standard air has 21% oxygen.
O %
2
Limits the maximum depth to which the nitrox
mixture can be safely used. The maximum partial
Partial pressure pressure limit for enriched air diving is 1.4 bar (20
of oxygen (O2) psi). The contingency partial pressure limit is 1.6
bar (23 psi). Dives beyond this limit risk
immediate oxygen toxicity.
Reduced
gradient
Modern algorithm for tracking both dissolved
bubble model and free gas in divers.
(RGBM)
Any dive whose decompression time limits are
Repetitive dive affected by residual nitrogen absorbed during
previous dives.
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Term
What it means
Residual
nitrogen
The amount of excess nitrogen remaining in a
diver after one or more dives.
Scuba
Self-contained underwater breathing apparatus.
Elapsed time between surfacing from a dive and
beginning a descent for the subsequent dive.
Surface time
Theoretical concept used to model bodily tissues
for the construction of decompression tables or
calculations.
Tissue group
Trimix
A breathing gas mix of helium, oxygen and
nitrogen.
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INDEX
decompression, 64
Decompression
Safety, 63
A
Activation
pre-checks, 16
Air mode, 39
Alarm, 28
Alarms, 19
Altitude adjustment, 52
Ascent rate, 25
deepstop
safety stop, 55
Depth alarm, 34
display, 11
Display
contrast, 34
Dive history
Memory mode, 35
Dive mode
Mixed, 40
Dive modes, 38
Air, 39
B
Backlight, 26
Battery, 76
indicators, 18
Bearing, 32
Bookmarks, 26
Gauge, 47
Dive numbering
Plan, 61
Dive planning, 48
Dive time alarm, 49
Diving mode
Air, 71
C
Calendar clock, 27
CCR diving, 54
Compass, 29, 32
Calibrate, 30
declination, 31
timeout, 32
E
D
Error State
Date, 27
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Er, 50
P
F
Personal adjustment, 52
Fused RGBM, 62
R
G
rebreather diving, 43
closed-circuit gases, 43
open-circuit gases, 43
Rebreather diving, 43, 54
Gauge mode, 47
Glossary, 83
H
S
handling
care, 74
safety stop, 25
Sample rate, 54
Set up, 13
high-altitude diving, 64
I
Setpoint
Icon, 11
CCR mode, 45
software version, 57
Stopwatch, 58
Surface time, 59
L
Logbook, 35
M
Mixed mode, 40
modes
T
Tank pressure, 66
Wireless transmission, 67
Tank pressure alarm, 71
Time, 27
change modes, 11
N
No-fly time, 59
Notifications, 19
Dual time, 28
Time mode, 27
Tones, 72
O
Oxygen toxicity, 65
Dive Planning, 51
U
units, 28
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W
Warnings, 19
Water contact
AC symbol, 72
Wireless transmitter
installing, 68
pairing, 68
transmitted data, 70
Wireless Transmitter, 18
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SUUNTO CUSTOMER SUPPORT
2. AUSTRALIA
AUSTRIA
CANADA
CHINA
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+31 1 0713 7269
+64 9887 5223
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© Suunto Oy 10/2012, 12/2015, 4/2016, 6/2016
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