Suunto EON STEEL 2.5 User manual

SUUNTO EON STEEL 2.5
USER GUIDE
2021-01-18

1. Intended use...................................................................................................................................................5
2. Safety...............................................................................................................................................................6
3. Getting started.............................................................................................................................................10
3.1. Set up..................................................................................................................................................10
3.2. Display - modes, views, and states............................................................................................10
3.3. Icons.................................................................................................................................................... 11
3.4. Product compatibility..................................................................................................................... 12
4. Features.........................................................................................................................................................13
4.1. Alarms, warnings, and notifications............................................................................................ 13
4.2. Algorithm lock..................................................................................................................................15
4.3. Altitude diving..................................................................................................................................15
4.4. Ascent rate....................................................................................................................................... 16
4.5. Battery............................................................................................................................................... 16
4.6. Bookmark..........................................................................................................................................17
4.7. Clock................................................................................................................................................... 17
4.8. Compass............................................................................................................................................17
4.8.1. Calibrating compass............................................................................................................17
4.8.2. Setting declination............................................................................................................. 18
4.8.3. Locking the bearing........................................................................................................... 18
4.9. Customize dive modes with DM5...............................................................................................19
4.10. Decompression algorithm..........................................................................................................20
4.10.1. Diver safety..........................................................................................................................21
4.10.2. Oxygen exposure..............................................................................................................21
4.11. Decompression dives....................................................................................................................21
4.11.1. Last stop depth................................................................................................................... 24
4.12. Deco profile................................................................................................................................... 24
4.13. Device info..................................................................................................................................... 26
4.14. Display.............................................................................................................................................26
4.15. Dive history....................................................................................................................................26
4.16. Dive modes....................................................................................................................................26
4.16.1. Air / Nitrox mode................................................................................................................27
4.16.2. Trimix mode....................................................................................................................... 28
4.16.3. CCR mode..........................................................................................................................29
4.16.4. Gauge mode......................................................................................................................30
4.17. Dive planner................................................................................................................................... 30
4.18. Enriched Air Nitrox diving use....................................................................................................31
4.19. Flip display...................................................................................................................................... 31
4.20. Gas consumption..........................................................................................................................31
4.21. Gas mixtures..................................................................................................................................32
4.22. Gas time.........................................................................................................................................33
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4.23. Language and unit system........................................................................................................33
4.24. Logbook.........................................................................................................................................34
4.25. Multi-gas diving............................................................................................................................34
4.25.1. Modifying gases during a dive..................................................................................... 35
4.25.2. Isobaric counterdiusion (ICD).................................................................................... 35
4.26. Oxygen calculations................................................................................................................... 36
4.27. Personal adjustments................................................................................................................. 36
4.28. Rebreather diving........................................................................................................................38
4.28.1. Closed-circuit gases........................................................................................................38
4.28.2. Open-circuit gases..........................................................................................................38
4.28.3. Setpoints............................................................................................................................38
4.28.4. Bailouts.............................................................................................................................. 39
4.29. Safety stops and deepstops.....................................................................................................40
4.30. Sample rate....................................................................................................................................41
4.31. Standby and deep sleep............................................................................................................. 41
4.32. Surface and no-fly time..............................................................................................................42
4.33. Suunto app....................................................................................................................................42
4.34. Suunto DM5.................................................................................................................................. 43
4.34.1. Synchronizing logs and settings.................................................................................. 43
4.34.2. Updating firmware...........................................................................................................43
4.35. SuuntoLink.................................................................................................................................... 44
4.36. Tank pressure ..............................................................................................................................44
4.37. Timer................................................................................................................................................44
4.38. Water contacts............................................................................................................................. 45
5. Use.................................................................................................................................................................46
5.1. How to access device info........................................................................................................... 46
5.2. How to change display brightness........................................................................................... 46
5.3. How to set language and unit.................................................................................................... 46
5.4. How to set time and date.............................................................................................................47
5.5. How to install and pair a Suunto Tank POD............................................................................47
5.6. How to plan a dive using the Dive planner............................................................................ 49
5.7. How to customize dive modes with DM5................................................................................50
5.8. How to enable gas consumption metering............................................................................ 52
5.9. How to add bookmarks................................................................................................................53
6. Care and support....................................................................................................................................... 54
6.1. Handling guidelines....................................................................................................................... 54
6.2. Installing scratch guard................................................................................................................54
6.3. Changing strap to bungee.......................................................................................................... 55
6.4. Charging battery............................................................................................................................55
6.5. Getting support.............................................................................................................................. 55
6.6. Disposal and recycling.................................................................................................................56
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7. Reference......................................................................................................................................................57
7.1. Technical specifications................................................................................................................. 57
7.2. Compliance......................................................................................................................................59
7.3. Trademark........................................................................................................................................ 60
7.4. Patent notice....................................................................................................................................60
7.5. International Limited Warranty....................................................................................................60
7.6. Copyright...........................................................................................................................................61
7.7. Dive terms..........................................................................................................................................61
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1. Intended use
The Suunto EON Steel dive computer is designed for use as an optional diving equipment for
recreational diving. Suunto EON Steel is intended for use in various types of scuba diving, for
example, air, nitrox, trimix and CCR diving. In scuba diving use Suunto EON Steel dive
computer displays important information before, during and after the dive to enable safe
decision making. The most important pieces of information are dive depth, dive time and
decompression information. In addition, Suunto EON Steel can show the user other dive
related values, such as ascent speed, water temperature, and compass direction. It also helps
the diver to plan the dive and to follow through the dive plan.
Suunto EON Steel can be used as a standalone product or in combination with the Suunto
Tank POD, which measures the tank pressure and transmits the pressure reading information
to the Suunto EON Steel dive computer. The combination of the Suunto EON Steel and the
Tank POD is a Personal Protective Equipment under the EU Regulation 2016/425 and protects
against risks listed under PPE Risk Category III (a). Backup instruments, for example, depth
gauge, submersible pressure gauge, timer, or watch must be used. The diver must have
access to decompression tables whenever diving with a dive computer.
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2. 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.
WARNING: All computers experience failures. It is possible that this device may suddenly
fail to provide accurate information during your dive. Always use a backup dive device and
only dive with a buddy. Only divers trained in proper use of scuba diving equipment should
use this dive device! YOU MUST READ all the printed information included with the product
and the online user guide before diving. Failure to do so may lead to improper use, serious
injury or death.
NOTE: Make sure your Suunto dive computer always has the latest software with
updates and improvements. Check before every dive trip from www.suunto.com/support, if
Suunto has released a new software update to your device. When it is available, you must
install it before diving. Updates are made available to improve your user experience and are
part of Suunto´s philosophy of continuous product development and improvement.
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 dive instrument, contact your Suunto dealer
before diving. Always remember that YOU ARE RESPONSIBLE FOR YOUR OWN SAFETY!
Before leaving on a dive trip, inspect your dive computer thoroughly to make sure everything
is functioning properly.
At the dive site, perform your manual pre-checks on each device before entering the water.
Dive Computer Pre-check
Ensure that:
1. Suunto EON Steel is in the correct dive mode and the display is working as expected.
2. Altitude setting is correct.
3. Personal setting is correct.
4. Deep stops are set correctly.
5. Unit system is correct.
6. Compass is calibrated. Start the calibration manually in the menu under General »
Compass » Calibrate to also confirm that the dive computer audible sounds are working.
After successful calibration, you should hear a sound.
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7. The battery is fully charged.
8. All primary and backup gauges for time, pressure and depth, both digital and mechanical,
are showing correct, consistent readings.
9. If Suunto Tank PODs are in use, check that Suunto Tank POD is properly installed and the
tank valve is open. Please see the Suunto Tank POD User Guide for detailed information
and proper use.
10. If Suunto Tank PODs are in use, check that connections are working and gas selections
are correct.
NOTE: For Suunto Tank POD related information please see the instructions provided
with the product.
Safety precautions
WARNING: ONLY TRAINED DIVERS SHOULD USE A DIVE COMPUTER! Insucient
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: 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 makeup 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: 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!
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.
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.
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WARNING: Not for professional use! Suunto dive computers are intended for recreational
use only where maximum depth of operation is 80 meters. 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.
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 you believe or conclude
that there is any problem with any computer function, abort the dive immediately and safely
return to the surface. Call Suunto Customer Support and return your computer to an
authorized Suunto Service Center for inspection.
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.
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 Triox, Heliox and Nitrox or all of them, divers must have
specialized training for the type of diving they are doing.
WARNING: If you use the protective boot, always make sure there is no air or dirt stuck
under it. Carefully remove the air around the button area before diving. Failure to do so may
lead to malfunctioning, for example, the buttons may be accidentally pressed while diving.
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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.
WARNING: You must only charge your device using USB adapters that comply with the
IEC 62368-1 standard and have a maximum output of 5 V. Non-compliant adapters are a fire
hazard and a risk to personal injury and might damage your Suunto device.
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.
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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3. Getting started
3.1. 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.
2. Follow the startup wizard to set up the device. When ready, the device goes to surface
state.
3. Fully charge before first dive.
The startup wizard guides you through:
•Language
•Units
•Time format (12h/24h)
•Date format (dd.mm / mm.dd)
•Connecting with Suunto app (optional)
3.2. Display - modes, views, and states
Your Suunto EON Steel has three buttons that have dierent functions in dierent views. Short
pressing or long pressing them gets you to dierent functionalities.
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By default Suunto EON Steel has four main dive modes: Air / Nitrox, Trimix, CCR and Gauge.
Press and hold the middle button to enter Main menu and select the appropriate mode for
your dive under Dive settings » Mode.
Suunto EON Steel automatically restarts to change mode.
Suunto EON Steel has two main views: time/no deco and compass. Change the main view by
pressing the middle button.
More views are available through customization in DM5. See 5.7. How to customize dive
modes with DM5.
For more detailed information on the views availabe in the dierent modes, see 4.16. Dive
modes.
Suunto EON Steel automatically switches between surface and dive state. If you are more
than 1.2 m (4 ft) below the water level and the water contact is on, the dive state is activated.
When tank pressure screen is in use, you see the following information:
•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
•Temperature is 20°C
The switch window in the bottom right corner has diferrent information that can be changed
by short pressing the lower button.
3.3. Icons
Suunto EON Steel uses the following icons:
No-fly time
Surface (interval) time
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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
Bluetooth
3.4. Product compatibility
Suunto EON Steel can be used together with Suunto Tank POD for wireless transmission of
tank pressure to the dive computer. One or more Tank PODs can be paired with the dive
computer for multi-gas diving.
This dive computer can also be paired with the Suunto app over Bluetooth. With the app you
can transfer dive logs to Suunto app.
You may also connect this dive computer to a PC or Mac with the supplied USB cable and use
Suunto DM5 to modify device settings, plan dives, as well as update the dive computer
software.
With the optional bungee adapter kit for Suunto EON Steel, you can replace the default strap
with a bungee cord if desired.
Do not use this dive computer with any unauthorized accessories or attempt to connect
wirelessly with mobile apps or equipment not authorized or ocially supported by Suunto.
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4. Features
4.1. 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.
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.
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
CNS 100% Central nervous system toxicity level at 100% limit
OTU 300 Recommended daily limit for Oxygen tolerance unit
reached
Depth Depth exceeds your depth alarm limit
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Warning Explanation
Dive time Dive time exceeds your dive time alarm limit
Diluent high pO₂Diluent partial pressure of oxygen exceeds safe level
(>1.6); no immediate danger unless diluent is used, e.g.
diluent flush
Diluent low pO₂Diluent partial pressure of oxygen below safe level
(<0.18); no immediate danger unless diluent is used, e.g.
diluent flush
Gas time Gas time exceeds your gas time alarm limit, or tank
pressure is below 35 bar (~510psi), in which case gas
time is zero.
Safety stop broken Safety stop ceiling broken by more than 0.6 m (2 ft)
Tank pressure Tank pressure is below your tank pressure alarm limit.
Tank pressure is below your tank pressure alarm limit.
There is a built in 50-bar alarm that cannot be changed.
In addition to it there is a configurable tank pressure
alarm, you can set to any value and your dive computer
also shows an alarm when that value and 50 bar
pressures are reached. The tank pressure number is
forced onto the display and turns yellow after the value
you set and red after 50 bar.
Notifications indicate events that require preventive actions. Acknowledge the notification by
pressing any button.
Notification Explanation
CNS 80% Central nervous system toxicity level at 80% limit
OTU 250 Approximately 80% of recommended daily limit for OTU
reached
Change gas On multi-gas dive when ascending, it is safe to switch to
next available gas for optimum decompression profile
Battery low Approximately three hours of dive time left
Recharge needed Approximately two hours of battery time left; re-charging
required before next dive
Setpoint switched Setpoint switched automatically on rebreather dive. See
4.28.3. Setpoints
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4.2. Algorithm lock
Breaking the decompression ceiling
When you ascend above the ceiling by more than 0.6 m (2 ft), the ceiling parameter turns red,
a red arrow pointing down appears, and an audio alarm is generated.
In such event, you should descend 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 Locked 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.
Algorithm locked
Suunto Fused™ RGBM 2 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 Locked is shown instead. Locking the algorithm is a safety feature, highlighting
that the algorithm information is no longer valid.
It is possible to dive with the device when the algorithm is locked, but instead of the
decompression information, Locked is shown. Diving while the algorithm is locked resets the
algorithm lock time back to 48 hours when you surface.
4.3. Altitude diving
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.
NOTE: If you are doing repetitive dives in a dierent altitude than the previous dive,
change altitude setting to correspond to the next dive after the previous dive ended. This
ensures more accurate tissue calculations.
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.
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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.
This setting automatically adjusts the decompression calculation according to the given
altitude range. You can find the setting under 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)
As a result, the allowed no decompression stop limits are considerably reduced.
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.
4.4. 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
When maximum allowed ascent rate is exceeded for five seconds, an alarm is generated.
Ascent rate violations result in longer safety stop times and mandatory safety stops.
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).
4.5. 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
your computer USB port.
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.
When the charge level drops below 2 (two) hours, you cannot start a dive
with Suunto EON Steel.
Battery is charging, showing current charge level as remaining dive time
A pop-up message indicates when recharge is needed.
4.6. Bookmark
Adding a bookmark (timestamp) to an active log is really easy in Suunto EON Steel. See 5.9.
How to add bookmarks for the procedure.
4.7. Clock
Suunto EON Steel's time and date settings are found under Device settings.
Time and date formats are found under Units & formats. For setting, see 5.4. How to set time
and date.
4.8. Compass
Suunto EON Steel includes a tilt-compensated digital compass, available as a main view.
4.8.1. Calibrating compass
When you first start using Suunto EON Steel, and after each charging, the compass needs to
be calibrated and it is required to do so to activate it. Suunto EON Steel displays the
calibration icon when you enter the compass view.
During the calibration process, the compass adjusts itself to the surrounding magnetic field.
Because of changes in the surrounding magnetic field, it is recommended to re-calibrate the
compass before each dive.
To manually start calibration:
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1. Take o your Suunto EON Steel.
2. Keep the middle button pressed to enter the menu.
3. Browse to General » Compass.
4. Press the middle button to enter Compass.
5. Scroll up or down to select Calibrate.
6. Start calibrating the device by trying to move it around the xyz axels of the coordinate
system (like you were drawing a small circle) so that the magnetic field is as stable as
possible during the calibration. To achieve this, try to keep Suunto EON Steel in the same
location and do not move it around using large movements.
7. Repeat the rotation as long as the compass calibration is successful.
8. A sound indicates when 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.
4.8.2. Setting declination
You should always adjust your compass declination for the area where you are diving to get
accurate heading readings. Check the local declination from a trusted source and set the
value in Suunto EON Steel.
To set declination:
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 0.0ºscroll up towards East or
down towards West declination. To turn declination o, 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.
4.8.3. Locking the bearing
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:
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1. Press the middle button to change to the compass view.
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 dierence
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.
3. Press the middle button to enter Compass.
4. Select Clear bearing with the middle button.
5. Keep the middle button pressed to exit.
4.9. Customize dive modes with DM5
You can customize Suunto EON Steel views and features with Suunto DM5.
Watch the video on YouTube.
Customization is divided into four categories:
•Dive mode name
•Dive algorithm
•Gas settings
•Customize views
Create up to 10 dierent dive modes with up to four custom views each.
Dive mode name has a 15-character limit, and you can select Suunto Fused™ RGBM 2 or no
algorithm for Dive algorithm.
For Gas settings, the GAS menu content can be configured.
For more details, see 5.7. How to customize dive modes with DM5.
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4.10. Decompression algorithm
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) 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
The Suunto Fused™ RGBM 2 combines and improves widely respected Suunto RGBM and
Suunto Fused™ RGBM decompression models developed by Suunto together with Dr. Bruce
Wienke. (Suunto dive algorithms are a culmination of expertise and knowledge accumulated
over decades of development, testing and thousands upon thousands of dives.)
In Suunto Fused™ RGBM 2 the tissue half-times are derived from Wienke’s FullRGBM where
human body is modeled by fifteen dierent tissue groups. FullRGBM can utilize these
additional tissues and model the on-gassing and o-gassing more accurately. The amounts of
nitrogen and helium on-gassing and o-gassing in the tissues are calculated independently
from each other.
The Fused™ RGBM 2 supports open-circuit and closed-circuit diving up to a depth of 150
meters. Compared to previous algorithms, Fused™ RGBM 2 is less conservative on deep air
dives, allowing shorter ascent times. In addition, the algorithm no longer requires tissues to
be completely free of residual gases when calculating no-fly times, thereby reducing the
required time between your last dive and flying.
The advantage of Suunto Fused™ RGBM 2 is additional safety through its ability to adapt to a
wide variety of situations. For recreational divers it may oer 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 2 algorithm gives the
perfect tool to be used as a non-monitoring, set point dive computer.
NOTE: Suunto EON Steel software version earlier than 2.0 has Suunto Fused RGBM
algorithm. When you update the device, software will update the dive algorithm to latest
version.
NOTE: Make sure your Suunto dive computer always has the latest software with
updates and improvements. Check before every dive trip from www.suunto.com/support, if
Suunto has released a new software update to your device. When it is available, you must
install it before diving. Updates are made available to improve your user experience and are
part of Suunto´s philosophy of continuous product development and improvement.
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