Suunto Scuba Diving Equipment SS020305000 User Manual

SUUNTO EON STEEL 1.2  
USER GUIDE  
 
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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 EON Steel has two main views in surface and dive states:  
time/no deco and compass. Change the view by pressing the middle  
button.  
Suunto EON Steel automatically switches between surface and dive  
state. If you are more than 1.2 m (4 ft) below the water level, the  
dive state is activated.  
The following display shows Suunto EON Steel when tank pressure  
screen is in use:  
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Present depth is 19.0 m  
Active gas is Nitrox 32%  
Dive time is 22 minutes  
Tank pressure left is 120 bar  
No decompression time is 50 minutes  
Safety stop is ahead at 3.0 meters  
21 hours of diving time left before need to recharge  
2.2 Icons  
Suunto EON Steel uses the following icons:  
No-fly time  
Surface (interval) time  
Battery status (for device: charging, ok, low; for  
Tank POD: ok, low)  
Battery level - number indicates remaining diving  
time before need to recharge  
Tank / gas pressure information  
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Tank POD alert (device is not receiving signal from  
Tank POD)  
2.3 Set up  
To get the most out of your Suunto EON Steel , use some time to  
customize features and displays. Make absolutely sure that you  
know your computer and have it set up as you want before getting  
into the water.  
To get started  
1. Wake up the device by connecting the USB cable to PC/Mac (or  
USB power source if available).  
2. Follow the startup wizard to set up the device. When ready, the  
device goes to surface state.  
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3. Fully charge before first dive.  
The startup wizard guides you through:  
Units settings  
Time format (12h/24h)  
Date format (dd.mm / mm.dd)  
Connecting with DM5 (optional)  
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3 FEATURES  
3.1 About Suunto EON Steel  
Information about your Suunto EON Steel can be found under  
General / About EON. This information includes device history,  
software version and radio compliance.  
To access Suunto EON Steel information  
1. Keep middle button pressed to enter the main menu.  
2. Scroll to GENERAL with the upper or lower buttons and press the  
middle button.  
3. Press the middle button to enter About EON.  
4. Keep middle button pressed to go back and exit from the menu.  
3.2 Alarms, warnings and notifications  
Suunto EON Steel has color-coded alarms, warnings and  
notifications. They are shown prominently on the display with an  
audible alarm (if tones are on). Alarms are always red. Warnings  
may be red or yellow. Notifications are always yellow.  
When an alarm, warning, or notification occurs, a message is  
displayed as a pop-up. Pop-up messages can be acknowledged by  
pressing any button. The information needing attention remains on  
screen or as a scrollable element in the bottom field until the  
situation is back to normal.  
Alarms are critical events that always require immediate action.  
When an alarm situation comes back to normal, the alarm will stop  
automatically.  
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Alarm  
Explanation  
Ascent speed exceeds safe speed of 10  
m (33 ft) per minute for five seconds or  
more.  
Decompression ceiling broken by more  
than 0.6 m (2 ft) on a decompression  
dive. Immediately descend back below  
ceiling depth and continue to ascend  
normally.  
Partial pressure of oxygen exceeds safe  
level (>1.6). Immediately ascend or  
change to a gas with lower oxygen  
percentage.  
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Alarm  
Explanation  
Partial pressure of oxygen below safe  
level (<0.18). Immediately descend or  
change to a gas with higher oxygen  
percentage.  
Warnings alert you to events that can impact your health and safety  
if you do not take action. Acknowledge the warning by pressing  
any button.  
Warning  
Explanation  
Central nervous system toxicity level at  
100% limit  
CNS100%  
Recommended daily limit for Oxygen  
tolerance unit reached  
OTU300  
DEPTH  
Depth exceeds your depth alarm limit  
Dive time exceeds your dive time alarm  
limit  
DIVE TIME  
Diluent partial pressure of oxygen  
exceeds safe level (>1.6); no immediate  
danger unless diluent is used, e.g. for  
bailout  
DILUENT HIGH PO2  
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Warning  
Explanation  
Diluent partial pressure of oxygen  
below safe level (<0.18); no immediate  
danger unless diluent is used,e.g. for  
bailout  
DILUENT LOW PO2  
Gas time exceeds your gas time alarm  
limit, or tank pressure is below 35 bar  
(~510psi), in which case gas time is  
zero  
GAS TIME  
Safety stop ceiling broken by more  
than 0.6 m (2 ft)  
SAFETY STOP BROKEN  
TANK PRESSURE  
Tank pressure is below your tank  
pressure alarm limit  
Notifications indicate events that require preventive actions.  
Acknowledge the notification by pressing any button.  
Notification  
CNS80%  
Explanation  
Central nervous system toxicity level at  
80% limit  
Approximately 80% of recommended  
daily limit for OTU reached  
OTU250  
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Notification  
Explanation  
On multi-gas dive when ascending, it is  
BETTER GAS AVAILABLE safe to switch to next available gas for  
optimum decompression profile  
Approximately three hours of dive  
time left  
LOW BATTERY  
Approximately two hours of battery  
RE-CHARGE NEEDED  
SETPOINT SWITCHED  
time left; re-charging required before  
next dive  
Setpoint switched automatically on  
rebreather dive. See 3.23.3 Setpoints  
TANK POD LOW  
BATTERY  
Tank POD battery life low; battery  
change required  
3.2.1 Configurable alarms  
There are four configurable alarms: depth, dive time, tank pressure,  
and gas time alarm. These alarm settings can be found under Diving  
settings / Alarms. Each of these alarms can have its own limit and  
be separately turned on or off.  
NOTE: Tank pressure reading turns red if it goes below 50 bar  
(720 psi).  
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NOTE: Gas time reading shows zero and turns red if tank  
pressure goes below 35 bar (500 psi).  
3.3 Algorithm lock  
Suunto Fused™ RGBM algorithm is locked for 48 hours if you omit  
decompression stops for longer than three (3) minutes. When the  
algorithm is locked, no algorithm information is available and  
ERROR is shown instead. Locking the algorithm is a safety feature,  
highlighting that the algorithm information is no longer valid.  
When you ascend above the decompression ceiling by more than  
0.6 m (2 ft), ERROR is shown prominently and an audio alarm is  
generated.  
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 EON Steel locks the algorithm calculation and  
displays ERROR instead, as shown below. Note that the ceiling value  
is no longer present.  
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In this state, you significantly increase your risk of decompression  
sickness (DCS). Decompression information is not available for the  
next 48 hours after surfacing.  
It is possible to dive with the device when the algorithm is locked,  
but instead of the decompression information, ERROR is shown.  
Going to dive mode when algorithm is locked resets the algorithm  
lock time back to 48 hours when you surface.  
3.4 Ascent rate  
During a dive, the bar on the left indicates ascent rate. One bar step  
corresponds to 2 m (6.6 ft) per minute.  
The bar is also color coded:  
Green indicates ascent rate is ok, less than 8 m (26.2 ft) per  
minute  
Yellow indicates ascent rate is moderately high, 8-10 m (26-33 ft)  
per minute  
Red indicates ascent rate is too high, over 10 m (33 ft) per  
minute  
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When maximum allowed ascent rate is exceeded for five seconds,  
an alarm is generated. Ascent rate violations result in longer safety  
stop times.  
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 after you have  
exceeded the maximum recommended ascent rate. If this  
mandatory safety stop is not completed the decompression model  
will penalize your next dive(s).  
3.5 Battery  
Suunto EON Steel has a rechargeable lithium-ion battery. Charge  
the battery by connecting Suunto EON Steel to a power source with  
the included USB cable. As a power source use either your computer  
USB port or wall charger.  
The battery icon in the upper-left corner of the display shows the  
battery status. To the right of the battery icon is the estimated  
remaining dive time in hours.  
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Icon  
Explanation  
Estimated remaining dive time is 27 hours; no  
immediate need to recharge  
Estimated remaining dive time is three (3) hours or  
less; recharge needed  
Estimated remaining dive time is less than one (1)  
hour; recharge immediately  
Battery is charging, showing current charge level as  
remaining dive time  
When the charge level drops below 2 (two) hours, you cannot start  
a dive with Suunto EON Steel . A pop-up message indicates  
recharge is needed.  
3.6 Bookmark  
Keep the lower button pressed to add a bookmark (timestamp and  
heading) to the active log for later reference.  
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3.7 Calendar clock  
Time and date settings are found under General / Device settings /  
Time & date.  
Time and date formats are found under General / Device settings /  
Units and formats.  
To change time and date  
1. Keep the middle button pressed to enter menu.  
2. Browse to General / Device settings / Time & date.  
3. Scroll to Set time or Set date with the upper or lower button.  
4. Press the middle button to enter the setting.  
5. Adjust the setting with the upper or lower button.  
6. Press the middle button to move to the next setting.  
7. Press again the middle button when last value is set to save and  
go back to Time & date menu.  
8. Keep middle button pressed to exit when done.  
To change time and date formats  
1. Keep the middle button pressed to enter menu.  
2. Browse to General / Device settings / Units and formats.  
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3. Scroll to Time format or Date format with the upper or lower  
button.  
4. Follow steps 5-8 as above to change and save formats.  
3.8 Compass  
Suunto EON Steel includes a tilt-compensated digital compass,  
available as a main view.  
3.8.1 Calibrating compass  
When you first start using Suunto EON Steel , the compass needs to  
be calibrated. Suunto EON Steel displays the calibration icon when  
you enter the compass view. Calibrate the compass by slowly  
rotating the unit in your hand in large figure-8 loops.  
Watch the video on YouTube.  
During the calibration process, the compass adjusts itself to the  
surrounding magnetic field.  
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Because of changes in the surrounding magnetic field, it is  
recommended to re-calibrate the compass before each dive.  
To manually start calibration:  
1. Keep the middle button pressed to enter the menu.  
2. Browse to General / Compass.  
3. Press the middle button to enter Compass.  
4. Scroll up or down to select Calibrate.  
5. Start calibration by moving the device around in a 3D figure-8 as  
the image suggests.  
6. A sound indicates the calibration succeeded, and the screen goes  
back to Compass menu.  
NOTE: If the calibration fails several times in a row, you may be  
in an area with strong sources of magnetism, such as large metal  
objects. Move to another location and try to calibrate the compass  
again.  
3.8.2 Setting declination  
You should always adjust your compass declination for the area  
where you are diving to get accurate heading readings. Check the  
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local declination from a trusted source and set the value in Suunto  
EON Steel .  
To manually start calibration:  
1. Keep the middle button pressed to enter the menu.  
2. Browse to General / Compass.  
3. Press the middle button to enter Compass.  
4. Press the middle button again to enter Declination.  
5. Scroll up/down to set the angle of declination: Starting from 0.0º  
scroll up towards East or down towards West declination.  
To turn declination off, set declination angle to 0.0º.  
6. Press middle button to save changes and go back to the  
Compass menu.  
7. Keep the middle button pressed to exit.  
3.8.3 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.  
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 the reef  
before leaving the boat.  
You can reset the bearing lock at any time, but you can only clear a  
bearing lock while at the surface.  
To set a bearing lock:  
1. Press the middle button to change to the compass view.  
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2. Hold your Suunto EON Steel in level in front of you, with the top  
pointing in the direction to your target.  
3. Keep the lower button pressed until you see the Bearing locked  
notification.  
Once you have a bearing locked, the lock position is indicated on  
the compass rose, as shown below.  
Below your heading (large number in center of compass), you also  
see the relative difference between your bearing and your heading.  
So, for instance, when you want to travel in the exact direction of  
your bearing, the lower number should be 0°.  
If you want to set a new bearing lock, just repeat the same  
procedure above. Each bearing lock is recorded in your dive log  
with a time stamp.  
To clear the bearing lock from your compass view, you need to  
return to the surface.  
To clear a bearing lock:  
1. While in surface state, keep the middle button pressed to enter  
the main menu.  
2. Scroll to GENERAL with the upper or lower buttons and press the  
middle button.  
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3. Press the middle button to enter Compass.  
4. Select Clear bearing with the middle button.  
5. Keep the middle button pressed to exit.  
3.9 Customization  
You can customize Suunto EON Steel views and features with  
Suunto DM5. Create up to 10 different dive modes with up to four  
custom views each.  
Watch the video on YouTube.  
To customize Suunto EON Steel :  
DM5.  
2. Connect your Suunto EON Steel to the computer with the USB  
cable.  
3. In the devices window, select Suunto EON Steel .  
4. Select the Customization tab. You can create new dive modes  
and modify existing ones.  
NOTE: When creating or modifying dive modes, you need to  
synchronize the changes with your Suunto EON Steel before  
disconnecting the USB cable to save the changes to your device.  
Customization is divided into four categories:  
Dive mode name  
Dive algorithm  
Gas settings  
Customize views  
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Dive mode (name)  
Maximum length of the name is 15 characters. Use something short  
and simple that helps you identify easily the features and  
information that you have customized on this mode.  
Dive algorithm  
You can select to use Suunto Fused™ RGBM or no algorithm (see  
3.28 Suunto Fused RGBM). If you select no algorithm, Suunto EON  
Steel functions as a gauge (bottom timer) in that mode. If you select  
Suunto Fused RGBM, you have two additional options: personal  
setting (algorithm conservatism) and altitude setting.  
Gas settings  
Here you configure what you see under the Gas(es) menu in Suunto  
EON Steel . The multiple gases option can be turned on or off. Turn  
it on to be able to dive with multiple gases. When turned off, the  
gas menu is simplified and easier to use with only one gas.  
Helium can also be turned on or off. If you turn this off, you cannot  
see the helium component for any gases.  
The gas max pO setting can be set to manual or fixed. The fixed  
2
option means that the selected value is used for all gases and the  
option to manually edit them in the Gas(es) menu is disabled. When  
manual is selected, you can edit the gas max pO for each gas  
2
individually in the Gas(es) menu.  
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Customize views  
For each dive mode, you can create up to four custom views. For  
each view, there are two areas of view customization: style and  
content.  
The style of the mode can be graphical or classic. Graphical style  
presents information with additional visual elements:  
With classic, information is presented in the traditional manner  
using numbers:  
Within each view of the mode, you can define what information is  
shown in customizable fields. When editing the view in DM5, you  
get a preview of how it will look on your Suunto EON Steel .  
In each view, you can select multiple values for the field in the  
lower right corner. When you use the view in Suunto EON Steel ,  
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you can change what is shown in the field by pushing the lower  
button.  
3.10 Decompression dives  
If you exceed the no-decompression limit on a dive, Suunto EON  
Steel provides the decompression information required for ascent.  
Ascent information is always presented with two values:  
ceiling: depth that you should not go above  
asc. time: optimum ascent time in minutes to surface with given  
gases  
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.  
On a decompression dive, there could be three kinds of stops:  
Safety stop  
Deep stop  
Decompression stop  
You can turn deep stops on or off under Dive settings / Parameters.  
In addition, you can adjust the safety stop time to be 3, 4 or 5  
minutes.  
The illustration below presents how decompression is displayed on  
Suunto EON Steel . When you ascend close to the ceiling depth and  
enter the deco window area, two arrows appear in front of the  
ceiling number.  
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The deco window area is ceiling depth + 3.0 meters (9 ft). This is the  
area where decompression takes place.The closer to the ceiling you  
stay, the more optimal the decompression time is.  
If you ascend above the ceiling depth, there is still a safe margin  
area, equal to ceiling depth – 0.6 meters (2 ft). In this safe margin  
area, decompression calculation still continues, but you are advised  
to go down below ceiling depth. This is indicated by the ceiling  
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depth number turning yellow with a downward pointing arrow in  
front of it.  
If go above the safe margin area, the decompression calculation is  
paused until you go back down below this limit. An audible alarm  
and a downward arrow in front of a red ceiling number indicate  
unsafe decompression.  
If you ignore the alarm and stay above the safe margin for three  
minutes, Suunto EON Steel locks the algorithm calculation, and  
decompression information will not be available anymore on the  
dive. See 3.3 Algorithm lock.  
Below is a typical decompression dive view showing ascent time and  
the first required deep stop at 20.3 meters:  
Suunto EON Steel shows the ceiling value always from the deepest  
of these stops. deep stop and safety stop ceilings are always at  
constant depth when you are at the stop. Stop time is counted  
down in minutes and seconds.  
Below is an example of what Suunto EON Steel displays during deep  
stop:  
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Below is an example of what Suunto EON Steel displays during  
safety stop:  
With decompression stops, the ceiling is always decreasing while  
you are near the ceiling depth, providing continuous decompression  
with optimum ascent time.  
Below is an example of what Suunto EON Steel looks like on  
decompression stop:  
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NOTE: It is always recommended to keep close to the  
decompression ceiling when ascending.  
Ascent time is always the minimum time needed to reach the  
surface. It includes:  
Time required for deep stops  
Ascent time from depth at 10 m (33 ft) per minute  
Time needed for decompression  
WARNING: YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN  
DISPLAYED BY THE DIVE COMPUTER! The ascent time will increase  
if you: (1) remain at depth, (2) ascend slower than 10 m/min (33 ft/  
min), (3) make your decompression stop deeper than at the ceiling,  
and/or (4) forget to change the used gas mixture. These factors  
might also increase the amount of breathing gas required to reach  
the surface.  
3.10.1 Last stop depth  
You can adjust the last stop depth for decompression dives under  
Dive settings / Parameters / Last stop depth. There are three options  
3, 4.5 and 6 m (10, 15 and 20 ft).  
By default, the last stop depth is 3 m (10 ft). This is the  
recommended last stop depth.  
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NOTE: This setting does not affect the ceiling depth on a  
decompression dive. The last ceiling depth is always 3 m (10 ft).  
3.11 Display brightness  
The brightness of the display can be adjusted under General /  
Device settings / Brightness. The default value is 50%. Adjusting  
this value has direct impact on battery life.  
TIP: You can significantly extend battery life by turning down  
the display brightness.  
3.12 Dive history  
Dive history is a summary of all the dives done with your Suunto  
EON Steel . The history is divided by the type of dive: Air, Nitrox,  
Trimix, Gauge, CCR Air/Nitrox and CCR Trimix. CCR dives are  
categorized by the diluent content used on the dive.  
The history is divided by the type of dive: Air, Nitrox, Trimix and  
Gauge dives are logged separately. Each type summary includes the  
number of dives, cumulative dive hours and maximum depth.  
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NOTE: If there is more history information available than can be  
shown in a single screen, you can scroll through the additional  
information with the upper and lower buttons.  
3.13 Dive modes  
By default Suunto EON Steel has four different dive modes: Air/  
Nitrox, Trimix, CCR, and Gauge (bottom timer). Select the  
appropriate mode for your dive under Dive settings / Mode.  
NOTE: Air/Nitrox dive mode is a single gas mode. The Gas(es)  
menu under this mode will not allow you to add more than one  
gas. However, this can be changed through customization. See  
NOTE: Air/Nitrox mode is by default in graphical style and all  
the others in classical visual style. You can change this and other  
settings, as well as create additional dive modes using Suunto DM5.  
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Air/Nitrox, Trimix and CCR modes are intended for diving with  
decompression information, like no decompression stop time or  
decompression ceiling/ascent time.  
By default the decompression algorithm used in Suunto EON Steel is  
Suunto Fused™ RGBM. For more information about the algorithm,  
Gauge is a bottom timer mode and thus has no decompression  
information or calculation included.  
NOTE: After diving in gauge mode, decompression calculation is  
locked for 48 hours. If during this time you dive with Air/Nitrox,  
Trimix or CCR mode, there is no decompression calculation available  
and ERROR is shown in decompression information fields.  
3.14 Dive planner  
The dive planner in Suunto EON Steel helps you to quickly plan your  
next dive. The planner displays available no decompression time  
and gas times for your dive based on depth and gas mixture.  
The dive planner can also help you plan dives in series, taking into  
account the residual nitrogen from your previous dive(s) based on  
the planned surface time you enter.  
Before planning your first dive, make sure you have gone through  
the planner settings and configured them according to your  
personal preference. You can view the planner and adjust settings  
under the Dive planner menu.  
39  
 
 
These settings include tank size and pressure at the start of the dive  
as well as personal gas consumption (surface gas consumption). If  
you are not sure what your personal gas consumption is, we  
recommend using the default value of 25 L/min (0.90 cubic ft/min).  
NOTE: Estimated gas time is calculated based on tank pressure  
at start minus 35 bar (510 psi).  
The calculated no decompression time is based on dive depth and  
gas mixture. Any residual nitrogen from previous dives, as well as  
surface time, is taken into consideration. GAS TIME is dependent on  
the dive depth, personal consumption and tank size/pressure.  
In the dive planner display, you can edit depth and mixture.  
For example, for the first dive in a series, if you enter 21 meters and  
use a mixture of 32% oxygen, you see the following:  
In this example, the calculated values are:  
Dive number in the dive series: 1  
Available no decompression time: 58 minutes  
Remaining gas time: 32 minutes  
40  
 
When planning additional dives in series, the dive planner allows  
you to adjust surface time. In the example below, the surface time  
before the second dive is 1:37 minutes. Adjust surface time to see  
how it impacts no decompression time.  
3.15 Flip display  
You can flip the display of Suunto EON Steel to have the buttons on  
either the left or right side of the dive computer, making it easier to  
wear on either arm.  
Change the button orientation under General / Device settings / Flip  
display. Select Buttons right to have the buttons on the right-hand  
side or Buttons left to have them on the left-hand side.  
3.16 Gas consumption  
Gas consumption refers to your real-time consumption rate of gas  
during a dive. In other words, it is the amount of gas a diver would  
use in one minute on the surface. This is commonly known as your  
surface air consumption or SAC rate.  
Gas consumption rate is measured in liters per minute (cubic feet  
per minute). This is an optional field and needs to be added to your  
41  
 
   
custom dive mode views in DM5. In the classic view below, gas  
consumption rate is in the lower right-hand corner.  
To enable gas consumption  
1. Add the gas consumption filed to your custom dive mode in  
DM5. See 3.9 Customization.  
2. Install and pair a Suunto Tank POD. See 3.29 Tank pressure.  
3. After you have selected the correct gas and returned to the main  
time view, keep the middle button pressed to enter menu.  
4. Scroll to Gases with the lower button and select with the middle  
button.  
5. Scroll to the gas you just selected from your Tank POD and select  
with the middle button.  
6. Scroll to Tank size and select with the middle button.  
7. Check the tank size and change the size with the upper or lower  
button as needed. Confirm change with the middle button.  
8. Keep the middle button pressed to exit the menu.  
NOTE: For accurate gas consumption, you must define the tank  
size. Not defining the tank size leads to incorrect gas consumption  
readings.  
42  
 
3.17 Gas mixtures  
If Nitrox or Trimix dive mode is selected, you need to define the  
gas(es) for the decompression algorithm to work properly. You  
define the gases under Menu / Gas(es). In Nitrox mode, gas will  
have only oxygen (O %). Trimix mode has helium (He%) available,  
2
and there is also the possibility to choose multiple gases.  
NOTE: When you have analyzed your gas, you should round the  
result down when entering it for EON Steel. For example, if the  
analyzed gas is 31.8% oxygen, then define the gas as 31%. This  
makes the decompression calculations safer. Oxygen calculations  
(pO , OTU, CNS%) are also kept conservative, since the oxygen  
2
percent used for those are O % + 1.  
2
WARNING: THE DIVE COMPUTER WILL NOT ACCEPT  
FRACTIONAL PERCENTAGE VALUES OF OXYGEN CONCENTRATION.  
DO NOT ROUND UP FRACTIONAL PERCENTAGES! Rounding up will  
cause nitrogen percentages to be understated and will affect  
decompression calculations.  
NOTE: You can customize what you see in the Gas(es) menu.  
It is important to understand how the Gas(es) menu works on  
Trimix mode, where you can make use of multiple gases. In the  
example below, the menu has three gases and tx18/45 is selected as  
43  
 
 
the active gas. Even though only one gas is active, the  
decompression algorithm calculates ascent time (during dive) using  
all these three gases.  
To select another active gas:  
1. While in the Gas(es) menu, press the middle button to see gas  
options.  
2. Scroll with upper or lower buttons to highlight Select.  
3. Press the middle button again to confirm.  
If you are diving with only one gas, ensure you have only that one  
gas in the Gas(es) menu. Otherwise, Suunto EON Steel expects you  
to use all gases in the list and notifies you to change gases during  
the dive.  
NOTE: When you select CCR mode, gas mixtures are divided to  
3.18 Gas time  
Gas time refers to remaining air (gas) left with current gas mixture,  
measured in minutes. The time is based on tank pressure value and  
your current breathing rate.  
44  
 
 
Gas time is also highly dependent on your current depth. For  
example, all other factors being the same, including breathing rate,  
tank pressure and tank size, depth affects gas time as follows:  
At 10 m (33 ft, surrounding pressure 2 bar), gas time is 40  
minutes.  
At 30 m (99 ft, surrounding pressure 4 bar), gas time is 20  
minutes.  
At 70 m (230ft, surrounding pressure 8 bar), gas time is 10  
minutes.  
Gas time is a default field in the lower right-hand corner of default  
dive modes. If you are not using a Suunto Tank POD, the gas time  
field shows n/a  
3.19 Logbook  
Dive logs can be found under Menu / Logs. By default, they are  
listed by date and time.  
45  
 
 
Dive log details and profile can be browsed by scrolling through the  
log with upper or lower button and selecting it with the middle  
button.  
Each dive log contains data samples with fixed 10-second intervals.  
The dive profile includes a cursor for browsing the logged data,  
scrollable with upper and lower buttons. For more detailed log  
analyses, upload the dive(s) to Suunto DM5 (see 3.27 Suunto DM5  
When the logbook memory gets full, the oldest dives are deleted to  
make space for new ones.  
NOTE: If you surface and then dive again within five minutes,  
Suunto EON Steel counts this as one dive.  
46  
 
3.20 Multi-gas diving  
Suunto EON Steel allows gas changes during a dive between the  
gases defined in the Gas(es) menu. When ascending, you are always  
notified to change gases when a better gas is available.  
For example, you may have the following gases when diving to 55  
m (180.5 ft):  
tx18/45, MOD 58m  
tx50/10, MOD 21m  
oxygen, MOD 6m  
While ascending, you are notified to change gas at 21 m (70 ft) and  
6 m (19.7 ft) according to the maximum operating depth (MOD) of  
the gas.  
A pop-up notifies you when to change gases, as shown below:  
47  
 
 
WARNING: When diving with multiple gases, remember that the  
ascent time is always calculated with the assumption that you use  
all the gases found in the Gas(es) menu. Always check that you have  
only the gases for your current planned dive defined before you  
dive. Remove the gases that are not available for the dive.  
3.20.1 Isobaric counterdiffusion (ICD)  
Isobaric counterdiffusion (ICD) occurs when different inert gases  
(such as nitrogen and helium) diffuse in different directions during  
a dive. In other words, one gas is being absorbed by the body while  
the other is being released. ICD is a risk when diving with Trimix  
mixtures.  
This may happen during a dive, for example, when Trimix gas is  
switched to Nitrox or light Trimix. When the switch is made, helium  
and nitrogen rapidly diffuse in opposite directions. This produces a  
transient increase in total inert gas pressure which can lead to  
decompression sickness (DCS).  
Currently there are no algorithms that can address ICD. Therefore,  
you need to take it into account when planning Trimix dives.  
You can use Suunto EON Steel to plan your Trimix usage safely.  
Under the GASES menu, you can adjust oxygen (O ) and helium  
2
(He) percentages to see the change in partial pressure of nitrogen  
(ppN2) and the partial pressure of helium (ppHe) values.  
An increase in partial pressure is indicated by a positive number,  
and a decrease by a negative number. The changes in ppN2 and  
48  
 
 
ppHe are displayed next to each gas mixture that that you want to  
switch to. Maximum Operating Depth (MOD) is assumed to be the  
depth when start to use the gas mixture.  
An ICD warning is generated when the gas switch depth is greater  
than 10 m (30 ft) and either:  
1. The change ppN2 increases by more than +0.5, or  
2. The change in ppHe increases by more than +0.5 and ppN2  
decreases by more than -0.25.  
If these limits are exceeded with a gas switch, Suunto EON Steel  
indicates the risk of ICD as shown below:  
In this example, the available gas mixtures for a deep Trimix dive  
are:  
Trimix 15/55  
Trimix 35/10  
Trimix 50/10  
Oxygen  
Suunto EON Steel highlights the dangerous ICD condition when the  
gas mixture switches from 15/55 to 35|10 at a depth of 34.4 m.  
If this gas switch is made, the change in ppN2 and ppHe are far  
beyond the safe limits.  
49  
 
One way to avoid the ICD risk is to increase helium content in the  
35/10 gas mixture to a 35/25 Trimix mixture. This would keep the  
changes in partial pressure at a safe level and remove the danger of  
sudden ICD.  
3.21 Oxygen calculations  
During a dive, Suunto EON Steel calculates partial pressure of  
oxygen (pO ), central nervous system toxicity (CNS%) and  
2
pulmonary oxygen toxicity, tracked by OTU (oxygen toxicity units).  
The oxygen calculations are based on currently accepted exposure  
time limit tables and principles.  
By default in Air/Nitrox dive mode, CNS% and OTU values are not  
displayed until they reach 80% of their recommended limits. When  
either value reaches 80%, EON Steel notifies you and the value stays  
in the view. In default Trimix mode, CNS% and OTU values are  
displayed in the bottom-right corner field as scrollable info.  
NOTE: You can customize views to always show CNS% and OTU.  
3.22 Personal and altitude adjustments  
There are several factors that can affect your susceptibility to DCS.  
Such factors vary between divers, as well as from one day to  
another.  
The personal factors which tend to increase the possibility of DCS  
include:  
50  
 
   
exposure to low temperature – water temperature less than 20  
°C (68 °F)  
below average physical fitness level  
fatigue  
dehydration  
stress  
obesity  
patent foramen ovale (PFO)  
exercise before or after dive  
WARNING: SET THE CORRECT PERSONAL SETTING! Whenever it  
is believed that factors that tend to increase the possibility of DCS  
exist, it is recommended that you use this option to make the  
calculations more conservative. Failure to select the correct personal  
setting will result in erroneous dive and planning data.  
The five-step personal setting can be used to adjust the algorithm  
conservatism to fit your DCS susceptibility. You can find the setting  
under Menu / Dive settings / Parameters / Personal.  
Personal level  
Explanation  
Ideal conditions, excellent physical  
fitness, highly experienced with a lot  
of dives in the near past  
More aggressive (-2)  
51  
 
Personal level  
Explanation  
Ideal conditions, good physical fitness,  
well experienced with dives in the near  
past  
Aggressive (-1)  
Default (0)  
Ideal conditions (default value)  
Conservative (+1)  
More conservative (+2)  
Some risk factors or conditions exist  
Several risk factors or conditions exist  
WARNING: Personal adjustment setting 0, -1 or -2 causes a high  
risk of DCS, or other personal injury, and death.  
In addition to the personal setting, Suunto EON Steel can be  
adjusted for diving at different altitudes. This setting automatically  
adjusts the decompression calculation according to the given  
altitude range. You can find the setting under Menu / Dive  
settings / Parameters / Altitude and select from three ranges:  
0 – 300 m (0 – 980 ft) (default)  
300 – 1500 m (980 – 4900 ft)  
1500 – 3000 m (4900 – 9800 ft)  
WARNING: Traveling to a higher elevation can temporarily cause  
a change in the equilibrium of dissolved nitrogen in the body. It is  
recommended that you acclimatize to the new altitude before  
diving.  
52  
 
3.23 Rebreather diving  
By default Suunto EON Steel has one mode dedicated to rebreather  
diving, CCR mode. This mode uses fixed high/low setpoint values  
which you can modify in the dive computer or through DM5.  
Fixed setpoint calculation enables Suunto EON Steel to be used as a  
backup dive computer on rebreather dives. It does not control or  
monitor the rebreather unit in any way.  
When you select CCR mode (see 3.13 Dive modes), the gases menu is  
split into two: CC gases (closed-circuit gases) and OC gases (open-  
circuit gases).  
NOTE: For rebreather dives, Suunto EON Steel should be used as  
a backup device only. The primary control and monitoring of your  
gases should be done through the rebreather itself.  
3.23.1 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. You  
can define additional diluents as needed.  
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.  
53  
 
   
3.23.2 Open-circuit gases  
As with diluents, you must alway define the correct oxygen and  
helium percentages of bailout gas(es) for all your cylinders (and  
additional gases) to ensure correct tissue and oxygen calculation.  
Bailout gases for a rebreather dive are defined under OC gases in  
the main menu.  
3.23.3 Setpoints  
CCR mode has two setpoint values, low and high. Both are  
configurable:  
Low setpoint: 0.4 – 0.9 (default: 0.7)  
High setpoint: 1.0 – 1.6 (default: 1.3)  
Typically you do not need to modify the default setpoint values.  
However, you can change them as needed either in DM5 or under  
the main menu.  
To change setpoint values in Suunto EON Steel :  
1. While in surface state, keep middle button pressed to enter main  
menu.  
2. Scroll to Setpoint with the upper button and select with the  
middle button.  
3. Scroll to Low setpoint or High setpoint and select with the  
middle button.  
4. Adjust the setpoint value with the lower or upper button and  
accept with the middle button.  
5. Keep middle button pressed to exit menu.  
54  
 
   
Setpoint switching  
Setpoints can be switched automatically according to depth. By  
default the low setpoint switch depth is 4.5 m (15 ft), and the high  
setpoint switch depth is 21 m (70 ft).  
The auto setpoint switching is off by default for the low setpoint  
and on for the high setpoint.  
To change auto setpoint switching in Suunto EON Steel :  
1. While in surface state, keep middle button pressed to enter main  
menu.  
2. Scroll to Setpoint with the upper button and select with the  
middle button.  
3. Scroll to Switch low or Switch high and select with the middle  
button.  
4. Adjust the depth value for the setpoint switch with the lower or  
upper button and accept with the middle button.  
5. Keep middle button pressed to exit menu.  
Popup notifications indicate when the setpoint is switched.  
During a rebreather dive, you can also switch to a custom setpoint  
at any time.  
55  
 
To change to a custom setpoint:  
1. While diving in CCR mode, keep middle button pressed to enter  
main menu.  
2. Scroll to Custom setpoint and select with the middle button.  
3. Adjust the setpoint value as needed with the lower or upper  
button and accept with the middle button.  
A popup notification confirms the custom setpoint switch.  
3.23.4 Bailouts  
If at any point during a rebreather dive you suspect a malfunction  
of any sort, you should switch to a bailout gas and abort the dive.  
To change to a bailout gas:  
1. Keep the middle button pressed to enter main menu.  
2. Scroll to OC gases and select with middle button.  
3. Scroll to the desired bailout gas and select with the middle  
button.  
After a bailout gas is selected, the setpoint field is replaced with the  
pO value of the selected open-circuit gas.  
2
56  
 
 
If the malfunction is rectified or the dive situation otherwise  
normalizes, you can switch back to a diluent using the same  
procedure as below, but selecting from CC gases.  
3.24 Safety stops and deepstops  
A three (3) minute safety stop is always recommended for every  
dive over 10 meters (19.7 ft).  
The time for a safety stop is calculated when you are between 2.4  
and 6 m (7.9 and 19.7 ft). This is presented with up/down arrows in  
front of the stop depth. The safety stop time is shown in minutes  
and seconds. The time may exceed three (3) minutes if you ascend  
too fast during dive.  
Deepstops activate when you dive deeper than 20 m (65.6 ft).  
Deepstops are presented like safety stops. You are in the deepstop  
57  
 
 
area when the deepstop depth has up/down arrows in front of it  
and deepstop time is running.  
3.25 Sample rate  
Suunto EON Steel uses a fixed sample rate of 10 seconds for all log  
recordings.  
3.26 Surface and no-fly time  
After a dive, Suunto EON Steel displays surface time since the  
previous dive and a countdown time for recommended no-fly time.  
During the no-fly time, flying or traveling to higher altitude should  
be avoided.  
58  
 
   
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, no no-fly time is displayed.  
If decompression is omitted during a dive so that Suunto EON Steel  
enters permanent error mode (see 3.3 Algorithm lock), the no-fly  
time is always 48 hours. Similarly, if 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!  
3.27 Suunto DM5 and Movescount  
The Suunto DM5 software program allows you to track and analyze  
all of your dive logs and plan your future dives. With DM5 you can  
customize your Suunto EON Steel and update the device firmware.  
NOTE: Mono framework is required when using DM5 on a Mac.  
59  
 
 
Movescount is an online sports community that integrates with  
Suunto DM5. Through Movescount your can share your dives with  
others.  
3.27.1 Synchronizing logs and settings  
To be able to synchronize logs and settings, you need to first install  
Suunto DM5 (see 3.27 Suunto DM5 and Movescount).  
To download logs from your Suunto EON Steel and sync settings:  
1. Start Suunto DM5.  
If you are also using Suunto Moveslink, exit Moveslink before  
proceeding.  
2. Connect your Suunto EON Steel to your computer with the USB  
cable.  
3. Wait for the syncing to complete.  
New dive logs appear in the DM5 Dives list on the left sorted by  
date and time.  
3.27.2 Updating firmware  
Suunto DM5 is required to install new firmware for your Suunto  
EON Steel . If a new firmware version is available, you are notified  
when you plug in the USB cable.  
Before updating the firmware, make sure the USB is securely  
connected. The cable must not be unplugged until update process is  
completed.  
Watch the video on YouTube.  
To update firmware:  
60  
 
   
1. Select Suunto EON Steel from the devices list in DM5  
If you are also using Suunto Moveslink, exit Moveslink before  
proceeding.  
2. Synchronize if needed.  
3. Click update and wait for the update process to complete. This  
may take 10 minutes or more.  
3.28 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  
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  
61  
 
 
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.  
3.28.1 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. Two personal adjustment  
settings (P-1 and P-2) are available for divers who dive constantly  
and are ready to accept greater personal risk.  
62  
 
 
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.  
3.28.2 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.  
63  
 
 
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.  
3.28.3 Oxygen exposure  
The oxygen exposure calculations are based on currently accepted  
exposure time limit tables and principles. In addition to this, the  
dive computer uses several methods to conservatively estimate the  
oxygen exposure. For example:  
The displayed oxygen exposure calculations are raised to the  
next higher percentage value.  
The CNS% limits up to 1.6 bar (23.2 psi) are based on 1991 NOAA  
Diving Manual limits.  
The OTU monitoring is based on the long-term daily tolerance  
level and the recovery rate is reduced.  
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 is provided before and during a dive when the  
computer is set in Air/Nitrox or Trimix:  
The selected O % (and possible helium %)  
2
64  
 
 
CNS% and OTU  
Audible notification when CNS% reaches 80%, then notification  
when 100% limit is exceeded  
Notifications when OTU reaches 250 and then again when 300  
limit is exceeded  
Audible alarm when pO value exceeds the preset limit (pO  
2
2
high alarm)  
Audible alarm when pO value is < 0.18 (pO low alarm)  
2
2
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.  
3.29 Tank pressure  
Your Suunto EON Steel can be used with multiple Suunto Tank  
PODs for wireless tank pressure transmission.  
To install and pair a Suunto Tank POD:  
1. Install the Tank POD and open the valve.  
65  
 
 
2. Wait for green LED on Tank POD to flash.  
3. If your Suunto EON Steel has a blank screen, press any key to  
activate it.  
4. Hold your Suunto EON Steel close to the Tank POD as shown.  
5. After a few seconds, a menu pops up on the screen showing the  
Tank POD serial number, battery status and the tank pressure.  
From the menu, select the correct gas for that Tank POD.  
66  
 
POD 128999459  
OK  
180bar  
Air  
WARNING: The battery level indication shown when pairing the  
Tank POD is an approximation only. The POD battery may deplete  
faster than the indication suggests.  
NOTE: We recommend changing the Tank POD battery after  
completing 200 dives or 2 years.  
Repeat the procedure above for additional Tank PODs and select  
different gases for each POD.  
NOTE: You cannot pair another Tank POD unless you have a  
second gas defined in Suunto EON Steel .  
Alternatively, you can select which Tank POD to use with each gas  
by selecting a Tank POD for the gas in question in the Gas(es)  
menu. When using this method, ensure the Tank POD has been  
activated by ensuring there is tank pressure reading in screen and  
67  
 
that it is within range. In the menu, the Tank POD is identified by  
the serial number printed on the Tank POD.  
In the dive main views, only one tank pressure is shown and  
corresponds to the active gas. When the gas is changed, the  
displayed tank pressure is also changed accordingly.  
WARNING: If there are several divers using Tank PODs, always  
check before you dive that the POD number of your selected gas  
corresponds to the serial number on your POD.  
123456789  
CAUTION: Never lift or carry your tank by holding the wireless  
tank pressure transmitter as this may break the cover and cause  
flooding of the unit. If your tank falls down with the transmitter  
attached to the regulator first stage, ensure that the transmitter has  
not been damaged before diving with it.  
68  
 
TIP: Remove pressure from the Tank Pod when not diving to  
save battery life.  
3.30 Timer  
Suunto EON Steel has a timer that can be used for timing specific  
actions during surface or dive. The timer is shown in bottom-right  
corner as scrollable item.  
NOTE: The timer can also be customized to be in graphical style  
as an analog watch in the center of the display.  
To use the timer:  
1. While diving, press upper button to start the timer.  
2. Press again the upper button to pause the timer.  
3. Keep the upper button pressed to reset the timer.  
Timer start and stop actions are saved to the dive log.  
3.31 Water contacts  
The water contact is located on the side of the case near the USB  
cable port. When submerged, the water contact poles are  
connected by the conductivity of the water. Suunto EON Steel  
switches to dive state when water is detected and the depth gauge  
senses water pressure at 1.2 m (4 ft).  
69  
 
   
4 CARE AND SUPPORT  
4.1 Handling guidelines  
Handle Suunto EON Steel with care. The sensitive internal electronic  
components may be damaged if the device is dropped or otherwise  
mishandled.  
Do not try to open or repair Suunto EON Steel by yourself. If you  
are experiencing problems with the device, please contact your  
nearest authorized Suunto Service Center.  
WARNING: ENSURE THE WATER RESISTANCE OF THE DEVICE!  
Moisture inside the device and/or battery compartment may  
seriously damage the unit. Only an authorized Suunto Service  
Center should do service activities.  
Wash and dry the dive computer after use. Rinse very carefully after  
any salt-water dive.  
Pay special attention to the pressure sensor area, water contacts,  
pushers, and USB cable port. If you use the USB cable before  
washing the dive computer, the cable (device end) should be rinsed  
as well.  
After use, rinse it with fresh water, mild soap, and carefully clean  
the housing with a moist soft cloth or chamois.  
70  
 
   
NOTE: Do not leave your Suunto EON Steel in a bucket of water  
(for rinsing). The display stays on under water and consumes battery  
life.  
Use only original Suunto accessories - damage caused by non-  
original accessories is not covered by warranty.  
TIP: Remember to register your Suunto EON Steel at  
4.2 Installing scratch guard  
Use the provided scratch guard to help protect your Suunto EON  
Steel from scratches.  
To install the scratch guard:  
1. Ensure the display glass is clean and dry.  
2. Peel back the protective layer from one end of the scratch  
guard.  
3. Place exposed adhesive side down squarely on one end of the  
display.  
4. Pull back the protective layer from the scratch guard.  
5. Press out any air bubbles with a soft, straight edge tool.  
Watch the video on : YouTube.  
71  
 
 
4.3 Changing strap to bungee  
You can change between the wrist strap and bungee as needed.  
The bungee is provided as an option.  
To install the bungee:  
1. Remove both strap ends using a TORX T7 (non-IP) screwdriver.  
2. Attach the bungee adapters.  
3. Thread the cord through both adapters.  
4. Securely tie the ends of the bungee cord and cut off excess cord.  
4.4 Charging battery  
Fully charged, Suunto EON Steel provides min. 20 hours of dive  
time. The expected lifetime of the rechargeable lithium-ion battery  
is 500 cycles.  
Charge Suunto EON Steel with the supplied USB cable. Connect the  
cable to a USB wall charger or a computer USB port. If the battery is  
72  
 
   
very low, the display remains dark while charging until the battery  
has reached an adequate charge level.  
CAUTION: DO NOT use the USB cable when Suunto EON Steel is  
wet. This may cause an electrical failure. Ensure the cable connector  
and connector pin area on the device are both dry. If you are using  
a protective boot, remove the boot from the connector pin area to  
clear any residual water droplets.  
NOTE: When connected, you may experience a tingling  
sensation when touching a metallic computer housing and Suunto  
EON Steel . This is caused by a minor electrical current created when  
the wall plug to the computer is not grounded.  
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.  
Rechargeable batteries have a limited number of charge cycles and  
may eventually need to be replaced. The battery should be replaced  
only by authorized Suunto Service Centers.  
4.5 Getting support  
you will find a comprehensive range of support materials, including  
Questions and Answers and instruction videos. You can also post  
73  
 
 
questions directly to Suunto or email/call Suunto support  
professionals.  
There are also many how-to videos on the Suunto YouTube channel  
support/ to get the best personalized support from Suunto.  
To get support from Suunto:  
question has been asked/answered already.  
2. If you cannot find an answer to your question online, submit a  
question using the form available at suunto.com/support.  
3. Call Suunto. See the latest list of numbers on the last page of  
Suunto’s qualified customer support staff will help you and, if  
needed, troubleshoot your product during the call.  
74  
 
5 REFERENCE  
5.1 Technical specifications  
Dimensions and weight:  
Length: 104.6 mm / 4.12 in  
Width: 60.5 mm / 2.38 in  
Height: 23.1 mm / 0.91 in  
Weight: 347 g / 12.2 oz  
Operating conditions  
Normal altitude range: 0 to 3,000 m / 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: 500 hours of diving or two years, whichever  
comes first  
NOTE: Do not leave the dive computer in direct sunlight!  
Depth gauge  
Temperature compensated pressure sensor  
Maximum depth of operation: 150 m / 492 ft (complying with EN  
13319)  
Maximum static pressure: 15 bar (complying with EN 13319 and  
ISO 6425)  
Accuracy: 1% of full scale or better from 0 to 150 m / 492 ft at  
20°C / 68°F (complying with EN 13319)  
Depth display range: 0 to 300 m / 984 ft  
75  
 
   
Resolution: 0.1 m from 0 to 100 m / 1 ft from 0 to 328 ft; 1 m  
from 100 to 150 m / 1 ft from 328 to 392 ft  
Temperature display  
Resolution: 1°C / 1.5 °F  
Display range: -20 to +50°C/-4 to +122°F  
Accuracy: 2°C/ 3.6°F within 20 minutes of temperature change  
Displays in mixed gas dive mode  
Helium %: 0–95  
Oxygen %: 5–99  
Oxygen partial pressure display: 0.0–3.0 bar  
CNS%: 0–500% with 1% resolution  
OTU: 0-500  
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 (>99 above 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  
Compass  
Accuracy: +/- 15°  
Resolution: 1°  
76  
 
Max. tilt: 45 degrees  
Balance: global  
Timer  
Accuracy: 1 second  
Display range: 0’00 – 99’59  
Resolution: 1 second  
Logbook  
Sample rate. 10 seconds  
Memory capacity: approximately 200 hours of diving  
Tissue calculation model  
Suunto Fused™ RGBM algorithm (developed by Suunto and  
Bruce R. Wienke, BSc, MSc, PhD)  
15 tissue compartments  
Tissue compartment halftimes for nitrogen: 1, 2, 5, 10, 20, 40, 80,  
120, 160, 240, 320, 400, 480, 560 and 720 min. The on-gassing  
and off-gassing halftimes are the same.  
Tissue compartment halftimes are divided by a constant factor to  
obtain helium halftimes.  
Reduced gradient (variable) M-values based on diving habit and  
dive violations. The M-values are tracked up to 100 hours after a  
dive  
The exposure calculations (CNS% and OTU) are based on  
recommendations by R.W. Hamilton, PhD and currently accepted  
exposure time limit tables and principles.  
Battery  
Type: rechargeable lithium-ion  
77  
 
Battery life: fully charged, min. 20h dive time  
The following conditions have an effect on the expected battery  
lifetime:  
The conditions in which the unit is operated and stored (for  
example, temperature/cold conditions). Below 10°C/50°F the  
expected battery lifetime is about 50- 75% of that at 20°C/68°F.  
The quality of the battery. Some lithium batteries may exhaust  
unexpectedly, which cannot be tested in advance.  
NOTE: Low temperature or an internal oxidation of the battery  
may activate the battery warning even though the battery has  
enough capacity. In this case, the warning usually disappears when  
the dive mode is activated again.  
5.2 Compliance  
5.2.1 CE  
Suunto Oy hereby declares that this Suunto EON Steel is in  
compliance with the essential requirements and other relevant  
provisions of Directive 1999/5/EC.  
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  
78  
 
       
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.  
5.2.4 FCC compliance  
This device complies with Part 15 of the FCC Rules. Operation is  
subject to the following two conditions:  
(1) this device may not cause harmful interference, and  
(2) this device must accept any interference received, including  
interference that may cause undesired operation. This product has  
been tested to comply with FCC standards and is intended for home  
or office use.  
Changes or modifications not expressly approved by Suunto could  
void your authority to operate this device under FCC regulations.  
5.2.5 IC  
This device complies with Industry Canada licence-exempt RSS  
standard(s). Operation is subject to the following two conditions:  
(1) this device may not cause interference, and  
(2) this device must accept any interference, including interference  
that may cause undesired operation of the device.  
5.3 Trademark  
Suunto EON Steel , its logos, and other Suunto brand trademarks  
and made names are registered or unregistered trademarks of  
Suunto Oy. All rights are reserved.  
79  
 
     
5.4 Patent notice  
This product is protected by pending patent applications and their  
corresponding national rights: US 13/803,795, US 13/832,081, US  
13/833,054, US 14/040,808, US 7,349,805, and US 86608266.  
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  
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:  
80  
 
   
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;  
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  
81  
 
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  
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  
82  
 
 
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 Dive terms  
Term  
Explanation  
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  
Ascent time  
CCR  
The minimum amount of time needed  
to reach the surface on a  
decompression stop dive.  
Closed-Circuit Rebreather. Scuba that  
recycles all exhaled gas.  
On a decompression stop dive, the  
shallowest depth to which a diver may  
ascend based on computed inert gas  
load.  
Ceiling  
CNS  
Central nervous system toxicity.  
Toxicity is caused by oxygen. Can cause  
a variety of neurological symptoms.  
The most important of which is an  
83  
 
 
Term  
Explanation  
epileptic-like convulsion which can  
cause a diver to drown.  
Central nervous system toxicity limit  
fraction.  
CNS%  
Compartment  
See Tissue group  
Decompression sickness/illness. Any of  
a variety of maladies resulting either  
directly or indirectly from the  
formation of nitrogen bubbles in  
tissues or body fluids, as a result of  
inadequately controlled  
DCS  
decompression.  
Time spent at a decompression stop, or  
range, before surfacing, to allow  
absorbed nitrogen to escape naturally  
from tissues.  
Decompression  
On a decompression stop dive, the  
depth range between the floor and  
the ceiling within which a diver must  
stop for some time during ascent.  
Decompression range  
Dive series  
A group of repetitive dives between  
which the dive computer indicates  
some nitrogen loading is present.  
84  
 
Term  
Explanation  
When nitrogen loading reaches zero  
the dive computer deactivates.  
Elapsed time between leaving the  
surface to descend, and returning to  
the surface at the end of a dive.  
Dive time  
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  
MOD  
the partial pressure of oxygen (pO ) of  
2
the gas mix exceeds a safe limit.  
A single or repetitive dive that includes  
time spent at various depths and  
therefore has no decompression limits  
that are not determined solely by the  
maximum depth reached.  
Multi level dive  
Nitrox (Nx)  
In sports diving, refers to any mix with  
a higher fraction of oxygen than  
standard air.  
85  
 
Term  
Explanation  
No decompression stop time. The  
maximum amount of time a diver may  
remain at a particular depth without  
having to make decompression stops  
during the subsequent ascent.  
No deco  
Any dive which permits a direct,  
uninterrupted ascent to the surface at  
any time.  
No decompression dive  
Abbreviation for no decompression  
time limit.  
No dec time  
OC  
Open-circuit. Scuba that exhausts all  
exhaled gas.  
Oxygen tolerance unit. Used to  
measure the whole-body-toxicity,  
caused by prolonged exposure to high  
oxygen partial pressures. The most  
common symptoms are irritation in the  
lungs, a burning sensation in the chest,  
coughing and reduction of the vital  
capacity.  
OTU  
Oxygen percentage or oxygen fraction  
in the breathing gas. Standard air has  
21% oxygen.  
O %  
2
86  
 
Term  
Explanation  
Partial pressure of oxygen. Limits the  
maximum depth to which the nitrox  
mixture can be safely used. The  
maximum partial pressure limit for  
enriched air diving is 1.4 bar. The  
contingency partial pressure limit is 1.6  
bar. Dives beyond this limit risk  
immediate oxygen toxicity.  
pO  
2
Any dive whose decompression time  
limits are affected by residual nitrogen  
absorbed during previous dives.  
Repetitive dive  
Residual nitrogen  
RGBM  
The amount of excess nitrogen  
remaining in a diver after one or more  
dives.  
Reduced gradient bubble model.  
Modern algorithm for tracking both  
dissolved and free gas in divers.  
Semi-closed rebreather. Scuba that  
recycles a portion of exhaled gas.  
SCR  
Self-contained underwater breathing  
apparatus.  
Scuba  
87  
 
Term  
Explanation  
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.  
88  
 
INDEX  
setting declination, 26  
customization, 29  
views, 29  
customozation  
dive modes, 29  
A
alarms, 15  
configurable alarms, 19  
altitude adjustment, 50, 62  
altitude dive, 63  
ascent rate, 21  
ascent time, 32  
D
date, 24  
declination, 26  
decompression  
last stop depth, 36  
decompression dive, 32  
decompression stop, 32  
deep stop, 32  
deepstop, 57  
display, 11  
display brightness, 37  
state, 11  
view, 11  
dive history, 37  
dive mode, 38  
Air/Nitrox, 38  
CCR, 38  
B
battery, 22, 72  
battery icon, 22  
battery level, 12  
battery status, 12  
charging, 22  
charging battery, 72  
bookmark, 23  
bungee, 72  
installing bungee, 72  
C
calendar clock, 24  
care, 70  
compass, 25  
bearing lock, 27  
calibrating compass, 25  
Gauge, 38  
Trimix, 38  
89  
 
 
dive profile, 45  
icons, 12  
dive time, 22  
Isobaric counterdiffusion, 48  
DM5, 13, 29, 38, 45, 59  
syncing logs and settings, 60  
updating firmware, 60  
L
last stop depth, 36  
logbook, 45  
sample rate, 58  
syncing logs, 60  
E
error condition, 20  
F
M
firmware, 60  
Movescount, 29, 59  
multi-gas diving, 47  
updating firmware, 60  
Fused RGBM, 20, 38, 61  
algorithm lock, 20  
N
no-fly time, 12, 58  
notifications, 15  
G
gas consumption, 41  
gas mixtures, 43  
Nitrox, 43  
O
oxygen calculations, 50  
oxygen exposure, 64  
Trimix, 43  
P
gas time, 44  
gases  
personal adjustment, 50, 62  
active gas, 43  
change gas, 47  
gas mixtures, 43  
R
radio compliance, 15  
rebreather diving, 53, 54, 56  
closed-circuit gases, 53  
open-circuit gases, 54  
setpoints, 54  
H
handling  
wash, 70  
S
I
90  
 
safety stop, 32, 57  
scratch guard, 71  
software version, 15  
updating firmware, 60  
startup wizard, 13  
strap, 72  
support, 73  
surface time, 12, 58  
synchronizing, 60  
logs and settings, 60  
T
Tank POD, 12, 65  
pairing, 65  
tank pressure, 65  
time, 24  
timer, 69  
U
USB cable, 13, 22, 72  
W
warnings, 15  
water contacts, 69  
91  
 
SUUNTO CUSTOMER SUPPORT  
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Suunto is a registered trademark of Suunto Oy. All Rights reserved.  
 

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