If you are doing repetitive dives at an altitude other than the previous dive altitude, change altitude setting to correspond to the next dive after the previous dive ended. This ensures more accurate tissue calculations.
During a dive, the bar on the left indicates ascent rate. One bar step corresponds to 2 m (6.6 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).
Batteri
Suunto EON Steel Black has a rechargeable lithium-ion battery. Charge the battery by connecting Suunto EON Steel Black to a power source with the included USB cable. As a power source use either your computer USB port or a 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.
A pop-up message indicates when recharge is needed.
Bookmark
Adding a bookmark (timestamp) to an active log is really easy in Suunto EON Steel Black . See How to add bookmarks for the procedure.
Ceiling broken
Algorithm lock
This section describes what happens if you break the decompression ceiling when diving with Suunto Fused™ RGBM 2 algorithm.
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, down pointing arrow 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 Black 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
Locking the algorithm is a safety feature, highlighting that the algorithm information is no longer valid.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.
NOTE:
When you dive with Bühlmann 16 GF algorithm, the algorithm will not be locked even if you break the decompression ceiling and omit the decompression stops. See Warning: Ceiling broken for more information.
Warning: Ceiling broken
This section describes what happens if you break the decompression ceiling when diving with Bühlmann 16 GF algorithm.
Bühlmann 16 GF algorithm does not have the same algorithm lock as the one in Suunto Fused™ RGBM 2 algorithm. If you dive with Bühlmann 16 GF algorithm, your device will continue showing the original dive plan even if the decompression stop is violated. Approve the Ceiling broken warning by pushing the middle button.
When the warning disappears, Ceiling broken sign becomes visible on the left side of the screen.
Logs
If ceiling is broken during your dive, it will be visible in your dive logs. When you check the dive in numeric view, Ceiling broken is shown as a header of the log.
If you dive again after ceiling was broken, the new dive log has the header Ceiling broken in previous dive .
Dive planner
If ceiling is broken during your dive, it will be visible in the Dive planner. A pop-up message appears on the screen, saying Prior Ceiling Broken violation will affect planner accuracy . The message disappears after three seconds or it can be removed by pushing the middle button. After the message disappears, the planner can be used as usual.
Clock
Suunto EON Steel Black 's time and date settings are found under Device settings .
Time and date formats are found under Units & formats . For setting, see How to set time and date .
Compass
Suunto EON Steel Black includes a tilt-compensated digital compass, available as a main view.
Calibrating compass
When you first start using Suunto EON Steel Black , and after each charging, the compass needs to be calibrated and it is required to do so to activate it. Suunto EON Steel Black 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:
- Take off your Suunto EON Steel Black .
- Keep the middle button pressed to enter the menu.
- Browse to General » Compass .
- Press the middle button to enter Compass .
- Scroll up or down to select Calibrate .
- Start calibrating the device by trying to move it around the xyz axes 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 Black in the same location and do not move it around using large movements.
-
Repeat the rotation until the compass calibration is successful.
- 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.
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 Black .
To set declination:
- Keep the middle button pressed to enter the menu.
- Browse to General » Compass .
- Press the middle button to enter Compass .
- Press the middle button again to enter Declination .
- 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.
- Press middle button to save changes and go back to the Compass menu.
- Keep the middle button pressed to exit.
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:
- Press the middle button to change to the compass view.
- Hold your Suunto EON Steel Black in level in front of you, with the top pointing in the direction to your target.
- 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:
- While in surface state, keep the middle button pressed to enter the main menu.
- Scroll to General with the upper or lower buttons and press the middle button.
- Press the middle button to enter Compass .
- Select Clear bearing with the middle button.
- Keep the middle button pressed to exit.
Customizing dive modes with Suunto app
You can easily customize device and dive settings, such as dive modes and views with Suunto app. Create up to 10 different dive modes with up to four custom views each.
You can customize the following:
- Dive mode name
- Settings (e.g., personal setting, views, gases)
See How to customize dive modes with Suunto app for more information.
Decompression algorithms
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
Suunto EON Steel Black has two decompression algorithms available: Suunto Fused™ RGBM 2 algorithm and Bühlmann 16 GF algorithm. Choose the appropriate algorithm for your dive under Dive settings » Parameters » Algorithm .
NOTE:
All decompression models are theoretical and have their benefits and limitations. When you choose the appropriate decompression algorithm and personal setting or gradient factors for your dive, always take your personal factors, the planned dive, and your dive training into consideration.
NOTE:
Although it is possible, changing the algorithm between dives is not recommended when no-fly time calculation is active.
NOTE:
Make sure your Suunto dive computer always has the latest software with updates and improvements. Check before every dive trip from support, if Suunto has released a new software update for your device. When a new software update 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.
Suunto Fused™ RGBM 2 algorithm
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 Full RGBM where human body is modeled by fifteen different tissue groups. Full RGBM 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.
Suunto Fused™ RGBM 2 algorithm supports open-circuit and closed-circuit diving up to a depth of 150 meters. Compared to previous algorithms, Suunto Fused™ RGBM 2 is less conservative on deep air dives, allowing shorter ascent times during decompression dives. 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 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 2 algorithm gives the perfect tool to be used as a non-monitoring, set point dive computer.
NOTE:
Suunto EON Steel devices with software version earlier than 2.0 use Suunto Fused™ RGBM algorithm. Once updated to the latest software, Suunto Fused™ RGBM 2 will be installed to the dive computer.
Bühlmann 16 GF algorithm
The Bühlmann decompression algorithm was developed by Swiss physician Dr. Albert A. Bühlmann, who researched into decompression theory starting from 1959. The Bühlmann decompression algorithm is a theoretical mathematical model describing the way in which inert gases enter and leave the human body as the ambient pressure changes. Several versions of the Bühlmann algorithm have been developed over the years and adopted by many dive computer manufacturers. Suunto’s Bühlmann 16 GF dive algorithm is based on the model ZHL-16C. This model has 16 different theoretical tissue groups with half times from 4 minutes up to 635 minutes.
Gradient factors
Gradient Factor (GF) is a parameter which is used only with the Bühlmann dive algorithm. GFs are a way to add conservatism to the Bühlmann algorithm by adding deepstops to the dive. GFs are divided into two separate parameters, Gradient Factor Low and Gradient Factor High. By using GF with the Bühlmann algorithm you can set your safety margin for the dive by adding conservatism to control when different tissue compartments reach their acceptable M‑value.
Gradient factors are always defined as percentages. The Low % value determines the first deepstop, while the High % value defines the allowed M-value once surfacing. Using this method, the GF changes throughout the ascent.
A commonly used combination is GF Low 30% and GF High 70%. (Also written as GF 30/70.) This setting means that the first stop would take place once the leading tissue reaches 30% of its M-value. The lower the first number is, the less supersaturation is allowed. As a result, the first stop is required when you are deeper. In the following illustration, GF Low is set to 30% and the leading tissue compartments react to the 30% limit of M-value. At this depth the first decompression stop takes place.
When the ascent continues, the GF moves from 30% to 70%. GF 70 indicates the amount of supersaturation allowed when you get to the surface. The lower the GF High value is, the longer shallow stop is needed in order to off-gas before surfacing. In the following illustration, GF High is set to 70% and the leading tissue compartments react to the 70% limit of M-value. At this point you can come back to the surface and finish your dive.
The default setting of Suunto's Bühlmann 16 GF dive algorithm is 30/70. All values other than the default values are out of recommendation. If you modify the default values, the value number turns red and a warning appears on the screen.
WARNING:
Do not edit gradient factor values until you understand the effects. Some gradient factor settings can cause a high risk of DCS or other personal injury.
The effects of gradient factors on the dive profile
GF Low % effect on dive profile is illustrated in the following picture. It shows how GF Low % determines the depth where the ascent starts slowing down and the depth of the first decompression stop. The illustration shows how the different GF Low % values change the depth of the first stop. The higher the GF Low % value is, the shallower the first stop occurs.
NOTE:
If GF Low % value is too low, some tissues may still on-gas when the first stop occurs.
GF High % effect on the dive profile is illustrated in the following picture. It shows how GF High % determines the decompression time spent in the shallow phase of the dive. The higher the GF High % value is, the shorter the total dive time is, and the less time diver spend in shallow water. If GF High % is set to a lower value, the diver spends more time in shallow water and total dive time gets longer.
If you want to see the comparison of the Suunto Fused™ RGBM 2 algorithm and the Bühlmann 16 GF algorithm, go to suunto.com/support .
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.
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.
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 to Air/Nitrox or Trimix (if helium is activated in use):
- The selected O 2 % (and possible helium %)
- CNS% and OTU (visible only after your customization in Suunto app)
- Audible notification when CNS% reaches 80%, then warning when 100% limit is exceeded
- Notification when OTU reaches 250 and then warning when 300 limit is exceeded
- Audible alarm when pO 2 value exceeds the preset limit (pO 2 high alarm)
- Audible alarm when pO 2 value is < 0.18 (pO 2 low alarm)
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.
Decompression dives
When on a decompression (deco) dive you exceed the no decompression limit, Suunto EON Steel Black 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 can be three kinds of stops:
- Safety stop : this is a recommended three-minute stop for every dive over 10 meters (33 ft).
- Deepstop : this is a recommended stop when you dive deeper than 20 m (66 ft).
- Decompression stop : this is a compulsory stop on your decompression dive that is for your safety, preventing decompression sickness.
In Dive settings » Parameters , you can
- turn deepstops on or off (it is on by default)
- adjust the safety stop time to be 3, 4 or 5 minutes (default is 3 minutes)
- set last stop depth to 3.0 m or 6.0 m (default is 3.0 m)
The following illustration shows a decompression dive where the ceiling is at 17.7 m (58 ft):
From bottom to top you see the following in the above image:
-
There is a decompression window ( Deco window ) that is the distance between the decompression ceiling ( Deco ceiling ) plus 3.0 m (9.8 ft) and the decompression ceiling. So the decom window in this example is between 20.7 m (68 ft) and 17.7 m (58 ft). This is the area where decompression takes place. The closer to the ceiling you stay, the more optimal the decompression time is.
When you ascend close to the ceiling depth and enter the deco window area, two arrows appear in front of the ceiling depth value. The downward and upward pointing white arrows indicate that you are within the deco window.
-
If you ascend above the ceiling depth, there is still a safe margin area, equaling to ceiling depth minus 0.6 meters (2 ft). So in this example, it is between 17.7 m (58 ft) and 17.1 m (56 ft). In this safe margin area, decompression calculation still continues, but you are advised to go down below the ceiling depth. This is indicated by the ceiling depth number turning yellow with a downward pointing yellow arrow in front of it.
-
If you 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 pointing red arrow in front of the ceiling depth value indicate unsafe decompression.
If you ignore the alarm and stay above the safe margin for three minutes, Suunto EON Steel Black locks the algorithm calculation, and decompression information will not be available anymore on the dive. See Algorithm lock .
Decompression display examples
Suunto EON Steel Black shows the ceiling value always from the deepest of these stops.
In the below display, the ceiling depth is set to 17.1 m and the diver is currently at 17.1 m. White arrows beside the ceiling depth value show the diver is inside the decompression window.
The following example shows that the decompression ceiling depth is at 15.2 m and diver is at 14.7 m. Diver is still inside the decompression window but above the optimal limit. A yellow downward pointing arrow indicates the diver is recommended to descend to be at optimal depth.
The following example shows that the decompression ceiling depth is at 12.4 m and diver is at 11.0 m. The diver is outside of the decompression window and must descend. A red arrow and an alarm sound prompt the diver to dive deeper and the ceiling depth is indicated in red.
NOTE:
When you dive with the Suunto Fused™ RGBM 2 algorithm and the ceiling is broken for more than 3 minutes, the decompression algorithm gets locked.
With decompression stops, in the continuous ascent mode the ceiling is constantly decreasing while you are near the ceiling depth, providing continuous decompression with optimum ascent time. While in the stepped ascent mode, the ceiling is the same for a specific time and then moves upwards 3 m (9.8 ft) at a time.
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 deepstops
- Ascent time from depth at 10 m (33.0 ft) per minute
- Time needed for decompression
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 Gases 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.
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.
Last stop depth
You can adjust the last stop depth for decompression dives under Dive settings » Parameters » Last stop depth . There are two options: 3 m and 6 m (9.8 ft and 19.6 ft).
By default, the last stop depth is 3 m (9.8 ft). This is the recommended last stop depth.
NOTE:
This setting does not affect the ceiling depth on a decompression dive. The last ceiling depth is always 3 m (9.8 ft).
TIP:
Consider setting the last stop depth to 6 m (19.6 ft) when you dive in rough sea conditions and stopping at 3 m (9.8 ft) is challenging.
Deco profile
Deco profile can be selected in Dive settings » Parameters » Deco profile .
Continuous decompression profile
Traditionally, since Haldane’s 1908 tables, decompression stops have always been deployed in fixed steps such as 15 m, 12 m, 9 m, 6 m and 3 m. This practical method was introduced before the advent of dive computers. However, when ascending, a diver actually decompresses in a series of more gradual ministeps, effectively creating a smooth decompression curve.
The advent of microprocessors has allowed Suunto to more accurately model the actual decompression behavior. A continuous decompression curve is included in the Suunto Fused™ RGBM 2's working assumption.
During any ascent involving decompression stops, Suunto dive computers calculate the point at which the control compartment crosses the ambient pressure line (that is the point at which the tissue’s pressure is greater than the ambient pressure), and off-gassing starts. This is referred to as the decompression floor. Above this floor depth and below the ceiling depth is the decompression window. The range of the decompression window is dependent on the dive profile.
Off-gassing in the leading fast tissues will be slow at or near the floor because the outward gradient is small. Slower tissues may be still on-gassing and given enough time, the decompression obligation may increase, in which case the ceiling may move down and the floor may move up.
Suunto RGBMs optimize these two contradictory issues through a combination of a slow ascent rate and continuous decompression curve. It all comes down to proper control of the expanding gas during an ascent. This is why all Suunto RGBMs use a maximum ascent rate at 10 m/minute, which has proven over the years to be an effective protective measure.
The decompression floor represents the point at which the Suunto RGBM is seeking to maximize bubble compression, while the decompression ceiling is maximizing off-gassing.
The added advantage of having a decompression ceiling and floor is that it recognizes that in rough water, it might be difficult to maintain the exact depth to optimize decompression. By maintaining a depth below the ceiling but above the floor, the diver is still decompressing, although slower than optimal, and provides an additional buffer to minimize the risk that waves will lift the diver above the ceiling. Also, the continuous decompression curve used by Suunto provides a much smoother and a more natural decompression profile than the traditional “step” decompression.
Suunto EON Steel Black has a feature of displaying the decompression ceiling. The optimal decompression occurs in the decompression window, which is displayed by both upward and downward arrows. If the ceiling depth is violated, a downward pointing arrow and an audible alarm will prompt the diver to descend back to the decompression window.
Stepped decompression profile
In this decompression profile the ascent has divided into traditional 3 m (10 ft) steps or stages. In this model diver will decompress at traditional fixed depths.
NOTE:
Decompression profile selection is available for EON Steel Black devices and EON Steel devices with software update 2.5.
Device info
Information about your Suunto EON Steel Black can be found in your device. This information includes device name, serial number, software and hardware versions and radio compliance information. See How to access device info .
Display
Display LED backlight is always on when the device is active. It cannot be turned off, but you can turn the display brightness down to extend battery life significantly.
For display brightness adjustment, see How to change display brightness .
Dive history
Dive history is a summary of all the dives done with your Suunto EON Steel Black . The history is divided according to the dive type used for the dive. Each dive type summary includes the number of dives, cumulative dive hours and maximum depth. Enter History under General » About EON :
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.
Dive modes
By default, Suunto EON Steel Black has four dive modes: Air/Nitrox, Trimix, CCR and Gauge (bottom timer). Select the appropriate mode for your dive under Dive settings » Mode .
NOTE:
Suunto EON Steel Black shows all dive mode names in English. You can change dive mode names via Suunto app.
NOTE:
All dive modes are by default in classic view style. You can change this and other settings, as well as set new views and create additional dive modes using Suunto app.
In Suunto app you can create new or edit existing dive modes, modify screen layouts, change helium and multi-gas settings, and change dive type (OC/CC).
Air/Nitrox mode
By default, Air/Nitrox mode is for diving with regular air and diving with oxygen enriched gas mixtures.
Diving with nitrox gas mixture allows you to increase bottom times or reduce the risk of decompression illness. Suunto EON Steel Black provides you with information to adjust your dive and stay within safe limits.
When diving with nitrox gas mixture, both the percentage of oxygen in your tank and the oxygen partial pressure limit must be entered into Suunto EON Steel Black . This ensures correct nitrogen and oxygen calculations and the correct maximum operating depth (MOD), which is based on your entered values. The default oxygen percentage (O 2 %) setting is 21% (air) and oxygen partial pressure (pO 2 ) setting is 1.6 bar (23 psi).
NOTE:
When diving with a nitrox gas mixture, Suunto recommends changing the partial pressure to 1.4 bar (20 psi).
Air/Nitrox has two views by default:
-
No deco
-
Compass
NOTE:
Air/Nitrox dive mode has one active gas by default. You can edit this gas in the device menu where O 2 percentage and pO 2 value can be changed. To enable diving with more than one gas, you need to activate multi-gas diving under Dive settings » Parameters » Multiple gases . After this step you are able to add further gases in the Gases menu. Gas settings can also be customized in Suunto app.
Trimix mode
Trimix dive mode is for diving with a breathing gas consisting of oxygen, nitrogen and helium. With helium added, you can create gas mixtures optimal for your dive.
Trimix mode is typically for deep dives with extended dive time.
Trimix mode has two views by default:
-
No deco
-
Compass
NOTE:
In Trimix mode, Suunto EON Steel Black has the multiple gases option automatically turned on.
NOTE:
When diving with helium activated, deepstop is on by default, and it cannot be turned off.
CCR mode
CCR is a dive mode dedicated to rebreather diving.
When you select CCR mode, your device will have two different gas menus: CC gases (closed-circuit gases) and OC gases (open-circuit gases). For more information on diving in CCR mode, see Rebreather diving .
CCR mode has two views by default
-
No deco
-
Compass
NOTE:
When diving with helium activated, deepstop is on by default, and it cannot be turned off.
Gauge mode
Use Suunto EON Steel Black as a bottom timer with Gauge .
Gauge mode is a bottom timer only. It does not use any decompression algorithm, thus it does not include decompression information or calculations.
Gauge mode has two views by default.
-
Timer
-
Compass
NOTE:
After diving in Gauge mode, decompression calculation is locked for 48 hours. If during this time you dive again in Air/Nitrox, Trimix or CCR mode, the dive algorithm and the decompression calculation will not be available and Locked will be shown on the screen
NOTE:
Locked time is set back to 48 hours if you start a new dive while your device is locked.
Dive planner
The dive planner in Suunto EON Steel Black helps you to quickly plan your next dive. The planner displays available no decompression time and gas times for your dive based on depth, tank size and gas consumption set.
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.
NOTE:
It is important to adjust tank size, tank pressure and personal gas consumption to get the gas calculations right.
See How to plan a dive using the Dive planner for details on planning your dives.
Enriched Air Nitrox diving use
This device can be used with nitrox breathing gases (also known as oxy-nitrogen).
WARNING:
Do not use nitrox gas mixtures if you do not have proper training. Appropriate training courses about nitrox and oxygen diving are essential prior to the use of this kind of equipment with oxygen content greater than 22%.
WARNING:
In nitrox use, the maximum operating depth and exposure time are dependent on the oxygen content of the gas.
WARNING:
There is a danger when using nitrox that contaminants may give rise to an oxygen ignition.
WARNING:
The use of breathable air according to EN 12021 may contaminate the diving apparatus.
NOTE:
To minimize the risk of oxygen ignition, always open the pressure valve(s) slowly.
For information on Nitrox diving with Suunto Tank POD, see Suunto Tank POD Safety and Regulatory Information delivered with your Tank POD or available at SuuntoTankPodSafety .
Flip display
You can flip the display of Suunto EON Steel Black 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.
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 custom dive mode views in Suunto app. In the classic view below, gas consumption rate is in the bottom right corner.
For enabling gas consumption metering, see How to enable gas consumption metering .
Gas mixtures
By default, Suunto EON Steel Black has only one gas (air) available. The default oxygen percentage (O 2 %) setting is 21% (air) and oxygen partial pressure (pO 2 ) setting is 1.6 bar (23 psi). You can modify O 2 percentage and pO 2 settings in Gases menu.
NOTE:
When diving with a nitrox gas mixture, Suunto recommends changing the partial pressure to 1.4 bar (20 psi).
If you are diving with only one gas, ensure you have only that one gas in the Gases menu. Otherwise, Suunto EON Steel Black expects you to use all gases in the list and notifies you to change gases during the dive.
If you need more than one gas, activate multi-gas option in your device. Go to Dive settings » Parameters and turn on Multiple gases option.
You need to define all gas mixtures intended to use during the dive in the Gases menu because during your dive the decompression algorithm calculates ascent time using all gases available in the Gases menu.
If you want to use trimix gas mixtures (with helium activated), you need to turn helium on under Dive settings » Parameters . When this is done, you can change helium percentage (He%) for the selected gas in the Gases menu.
You can activate multi-gas diving and helium, configure dive modes and change gas settings using Suunto app, too.
Changing gas during a dive
It is important to understand how your Suunto EON Steel Black device works when you dive with multiple gases. For example, you may have the following gases when diving to 55 m (180.5 ft):
- tx18/45, MOD 62.2 m (pO 2 1.3)
- tx50/10, MOD 22 m (pO 2 1.6)
- Nx99, MOD 6 m
While ascending, you are notified to change gas at 22 m (72 ft) and 6 m (20 ft) according to the maximum operating depth (MOD) of the gas. To take a better gas into use, you need to change gas manually by completing the following steps:
- Press any button to acknowledge the gas change notification.
- Long press the middle button to see gas options.
- Scroll with the upper or lower buttons to the desired gas.
- Press the middle button to confirm gas selection.
NOTE:
If you press any button while Change gas notification is visible on the device screen, the notification disappears. By pressing a button, you only confirm the notification, but gas is not changed automatically. You should always change gas manually. To change gas, you must follow the above listed steps.
NOTE:
When you select CCR, gas mixtures are divided to open-circuit and closed-circuit gases. See Rebreather diving .
Modifying gases during a dive
Modifying the gas list in your device is for emergency cases only. For example, due to unforeseen events, you might lose a gas mixture, in which case you could adjust to the situation by deleting that gas mixture from the gas list of Suunto EON Steel Black . This allows you to continue diving and get correct decompression information calculated by the dive computer.
In another case, if for some reason you run out of gas and need to use a gas mixture from a dive buddy, it is possible to adapt Suunto EON Steel Black to the situation by adding the new gas mixture to the list. Suunto EON Steel Black re-calculates decompression and shows the correct information.
NOTE:
This feature is not enabled by default, it must be activated and it creates an additional step to the gas menu during the dive. It is only available if multiple gases are selected for the dive mode.
To enable modifying gases, turn the feature on in the settings menu under Dive settings » Parameters » Modify gases .
When enabled, during a multi-gas dive, you can add a new gas as well as select an existing gas from the gas list to remove it.
NOTE:
You cannot modify or remove the gas currently in use (active gas).
When Modify gases is turned on, you can remove gases which are not in use from the gas list, add new gases to the list, and modify parameters (O 2 , He, pO 2 ) of nonactive gases.
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 Black to plan your trimix usage safely. Under the Gases menu, you can adjust oxygen (O 2 ) and helium (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 ppHe are displayed next to each gas mixture that you want to switch to. Maximum operating depth (MOD) of a breathing gas is the depth at which the partial pressure of oxygen (pO 2 ) of the gas mix exceeds a safe limit. You can define pO 2 limit for the gas.
An ICD warning is generated when:
- Gas switch depth is greater than 10 m (33 ft).
- Geometric mean of the partial pressure change of N2 and partial pressure change of He is bigger than 0.35 bar.
If these limits are exceeded with a gas switch, Suunto EON Steel Black indicates the risk of ICD as shown below:
In this example, the available gas mixtures for a deep trimix dive are:
- Trimix 15/55, MOD 76.7 m (pO 2 1.3)
- Trimix 35/15, MOD 27.1 m (pO 2 1.3)
- Trimix 50/10, MOD 22 m (pO 2 1.6)
- Oxygen, MOD 6 m
Suunto EON Steel Black highlights the dangerous ICD condition when the gas mixture switches from 15/55 to 35/15 at a depth of 27.1 m.
If this gas switch is made, the change in ppN2 and ppHe are far beyond the safe limits.
One way to avoid the ICD risk is to increase helium content in the first decompression gas mixture (trimix 35/15) to get a 35/32 trimix mixture. Due to this change, the second decompression gas (trimix 50/10) needs more helium to avoid ICD risk. The second decompression gas mixture should be trimix 50/12. These modifications would keep the changes in partial pressure at a safe level and remove the danger of sudden ICD.
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.
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 (230 ft, surrounding pressure 8 bar), gas time is 10 minutes.
Gas time information is visible in Air/Nitrox and Trimix dive modes by default. If you have not paired a Suunto Tank POD, the gas time field shows n/a. If you have paired a POD but there is no data being received, the field shows –. This may be because the POD is not in range, the tank is closed, or the POD battery is low.
NOTE:
Set tank size under the Gases menu to get the gas consumption and the gas time calculations right.
NOTE:
Gas time reading shows zero and turns red if tank pressure goes below 35 bar (500 psi).
Language and unit system
You can change the device language and unit system any time when you are not diving. Suunto EON Steel Black refreshes immediately to reflect the changes.
To set these values, see How to set language and unit .
Logbook
Dive logs can be found under Logs . They are listed by date and time, and each entry listing shows the max. depth and dive time of the log.
Dive log details and profile can be browsed by scrolling through the logs with the upper or the lower button and selecting a log 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. A blue line indicates depth, and a white line shows temperature. If you dive with Tank POD, tank pressure and gas consumption graphs become also visible.
The last page of the logbook contains further data. Press the middle button to find average depth, CNS percentage, and OTU value.
For more detailed log analyses, upload the dive(s) to the Suunto app.
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 Black counts it as one dive.
Oxygen calculations
During a dive, Suunto EON Steel Black calculates partial pressure of oxygen (pO 2 ), central nervous system toxicity (CNS%) and 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 on the screen as scrollable info.
NOTE:
You can customize views to always show CNS% and OTU.
Personal setting
Suunto Fused™ RGBM 2 algorithm provides 5 personal setting options (+2, +1, 0, -1, -2). These options refer to decompression models. +2 and +1 can be considered conservative, while -2 and -1 can be considered aggressive. 0 is the default setting and is neutral, for ideal conditions. Generally speaking, conservative means safer. In practice it means that a dive at a given depth is shorter due to the decompression obligation (the no decompression time is short).
Conservative also means that the time the diver needs to spend on decompression is longer. For recreational divers, a conservative model means less time in the water in order to avoid decompression requirements. For technical divers, however, conservative means more time in the water because of the longer decompression requirements imposed during ascent.
Aggressive models, on the other hand, increase the potential health risks of a dive. For recreational divers, an aggressive model allows more time at depth, but may significantly increase the risk of decompression sickness (DCS).
The default setting for the Suunto Fused™ RGBM and Fused™ RGBM 2 is to use a compromise (0 setting) between conservative and aggressive. With the personal setting, you can select gradually more conservative or more aggressive calculations.
There are several risk factors that can affect your susceptibility to DCS like your personal health and behavior. Such risk factors vary between divers, as well as from one day to another.
The personal risk factors which tend to increase the possibility of DCS include:
- exposure to low temperature – water temperature less than 20 °C (68 °F)
- below average physical fitness level
- age, particularly over the age of 50
- fatigue (from over exercising, lack of sleep, exhausting travel)
- dehydration (affects circulation and may slow down off-gassing)
- stress
- tight fitting equipment (may slow down off-gassing)
- obesity (BMI that is considered obese)
- patent foramen ovale (PFO)
- exercise before or after dive
- strenuous activity during a dive (increases bloodflow and brings additional gas to tissues)
WARNING:
SET THE CORRECT PERSONAL SETTING! Whenever it is believed that risk 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 Dive settings » Parameters » Personal .
| Personal level |
Explanation |
| More aggressive (-2) |
Ideal conditions, excellent physical fitness, highly experienced with a lot of dives in the near past |
| Aggressive (-1) |
Ideal conditions, good physical fitness, well experienced with dives in the near past |
| Default (0) |
Ideal conditions (default value) |
| Conservative (+1) |
Some risk factors or conditions exist |
| More conservative (+2) |
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.
Rebreather diving
By default Suunto EON Steel Black 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 Suunto app.
Suunto recommends using classic or graphical style with rebreather diving. However, you can use prominent view and customize fields if desired.
Fixed setpoint calculation enables Suunto EON Steel Black 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 your custom multi-gas mode for CCR (closed-circuit rebreather) diving in the dive mode setting, your device will have two different gas menus: CC gases (closed-circuit gases) and OC gases (open-circuit gases).
NOTE:
For rebreather dives, Suunto EON Steel Black should be used as a backup device only. The primary control and monitoring of your gases should be done through the rebreather itself.
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.
You can add only diluent(s) to the gas list. By default, Suunto EON Steel Black assumes that oxygen is used, so it is not shown in the gas list.
The correct oxygen and helium percentages of the diluent gases in your diluent cylinder(s) must always be entered into the dive computer (or through Suunto app) to ensure correct tissue and oxygen calculation. Diluent gases used on a rebreather dive are found under CC gases in the main menu.
Open-circuit gases
As with diluents, you must always define the correct oxygen and helium percentages of bailout gases 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.
Setpoints
Rebreather dive mode has two setpoint values, low and high. Both are configurable:
- Low setpoint: 0.4 – 0.9 (default: 0,7)
- High setpoint: 1.0 – 1.5 (default: 1,3)
Typically, you do not need to modify the default setpoint values. However, you can change them as needed either in Suunto app or under the main menu.
To change setpoint values in Suunto EON Steel Black :
- While in surface state, keep the middle button pressed to enter main menu.
- Scroll to Setpoint with the upper button and select with the middle button.
- Scroll to Low setpoint or High setpoint and select with the middle button.
- Adjust the setpoint value with the lower or upper button and accept with the middle button.
- Keep the middle button pressed to exit menu.
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 Black :
- While in surface state, keep the middle button pressed to enter main menu.
- Scroll to Setpoint with the upper button and select with the middle button.
- Scroll to Switch low or Switch high and select with the middle button.
- Adjust the depth value for the setpoint switch with the lower or upper button and accept with the middle button.
- Keep the 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.
To change to a custom setpoint:
- While diving in a rebreather mode, keep the middle button pressed to enter main menu.
- Scroll to Custom setpoint and select with the middle button.
- 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.
NOTE:
When you change to a custom setpoint, the automatic setpoint switching is turned off for the remainder of the dive.
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:
- Keep the middle button pressed to enter the main menu.
- Scroll to OC gases and select with the middle button.
- 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 2 value of the selected open-circuit gas.
If the malfunction is rectified or the dive situation otherwise normalizes, you can switch back to a diluent using the same procedure as described above, but selecting from CC gases .
Reset tissues
You have the possibility to reset tissue compartments, that is, to clear the data regarding the residual nitrogen and helium after a dive. After tissue reset, previous dives have no effects on dive algorithm calculations. See How to reset tissues for details on tissue reset.
Safety stops and deepstops
Safety stop and deepstop ceilings are always at constant depth when you are at the stop. Safety stop and deepstop times are counted down in minutes and seconds.
Safety stop
There are two types of safety stops: voluntary and mandatory. Safety stop is mandatory if ascent speed violation happened during the dive. Mandatory safety stop is shown in red, while voluntary safety stop is indicated with yellow.
A three (3) minute safety stop is always recommended for every dive over 10 meters (33 ft).
The time for a safety stop is calculated when you are between 2.4 and 6 m (7.9 and 19.8 ft). This is presented with up/down arrows on the left side of the stop depth value. Safety stop time is shown in minutes and seconds. The time may exceed three (3) minutes if you ascend too fast during dive. Ascent speed violation increases safety stop time with minimum 30 seconds. If violations happened several times, the additional stop time is longer. Safety stops can be set to three (3), four (4), or five (5) minutes.
Voluntary safety stop is shown in yellow:
Mandatory safety stop is shown in red:
NOTE:
Omitting mandatory safety stop does not lock the dive algorithm.
Deepstop
Deepstops activate only when you dive deeper than 20 m (66 ft). During ascend, deepstops activate when you are halfway up from your maximum depth. Deepstops are presented like safety stops. You are in the deepstop area when the deepstop depth has up/down arrows in front of it and deepstop time is running. The deepstop window is +/- 1.5 m (4.9 ft). Calculation starts at deepstop target depth plus 0.5 m (1.6 ft). Calculation ends - 3 m (- 10 ft) away from deepstop depth.
There can be more than one deepstop during ascend. For example, if you dive to 42 m (137.8 ft), the first deepstop is prompted at 21 m (68.9 ft) and the second is at 10.5 m (34.4 ft) The second deepstop is 2 minutes long.
In the following example the diver dives down to maximum 30.4 m (99.7 ft) and has a deepstop at 15.2 m (49.9 ft):
Below 20.0 m (66 ft), deepstop gets activated. In this case, as the diver ascends, the deepstop is necessary at halfway of the maximum depth, so at 15.2 m (49.9 ft).
If the deepstop depth is 15.2 m (49.9 ft), the calculation starts at 15.7 m (51.5 ft) and stops at 12.2 m (40.0 ft). The deepstop window is 1.5 m (4.9 ft) and when the diver is within the deepstop window, it is indicated with two white arrows pointing at each other on the display.
When the diver ascends above the deepstop window ceiling - in this case above 14.2 m (46.6 ft) - a downward pointing yellow arrow signals that the depth is not optimal, it is recommended to descend. The deepstop target depth number also turns yellow.
If the diver keeps ascending, after 0.5 m (1.6 ft), a downward pointing red arrow and an alarm notify the diver to descend immediately. The deepstop calculation keeps running for another 1.5 m (4.9 ft) up but stops after that. In the above example it stops at 12.2 m (40.0 ft).
NOTE:
For safety reasons, you cannot switch off deepstops if helium (trimix gas mixtures) is enabled for the dive mode in use. When helium is not in use, deepstops can be turned on and off. However, it is recommended that you turn deepstops on for all dives. If deepstops are turned on but omitted during a dive, it will affect your next dive which will be more conservative.
Sample rate
Suunto EON Steel Black uses a fixed sample rate of 10 seconds for all log recordings.
Standby and deep sleep
Standby and deep sleep are two functions that are designed to prolong battery life. Standby is an adjustable setting that turns off the screen after a set amount of time to save battery if Suunto EON Steel Black is not used.
To adjust the standby time:
- Keep the middle button pressed to enter the menu.
- Browse to General » Device settings » Standby .
- Press the middle button to enter Standby.
- Scroll up/down to select the desired standby time in minutes.
- Press the middle button to save changes and return to the Device settings menu.
- Keep the middle button pressed to exit.
Deep sleep
Deep sleep is a function that prolongs battery life when Suunto EON Steel Black has not been used for some time. Deep sleep is activated when two days have passed since:
- No buttons have been pressed
- Dive calculation has ended
Suunto EON Steel Black wakes up when it is connected to a PC/charger, when a button is pressed, or when the water contact gets wet.
Surface and no-fly time
After a dive, Suunto EON Steel Black displays surface time since the previous dive and a countdown time for the recommended no-fly time. During the no-fly time you should avoid flying or traveling to higher altitude.
No-fly time is the minimum surface time after a dive which is recommended to wait before flying with an airplane. It is always at least 12 hours. For desaturation times shorter than 75 minutes, no-fly time is not displayed. Maximum no-fly time is 72 hours.
If decompression is omitted during a dive and the dive algorithm is locked for 48 hours (see 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.
With Suunto Fused™ RGBM 2, the selected personal setting parameter (-2, -1, 0, +1, +2) is affecting no-fly time. The more conservative personal setting you have, the longer no-fly time values you will see. More aggressive personal setting will result in shorter no-fly time values.
Once the no-fly time calculated by your Suunto EON Steel Black with Suunto Fused™ RGBM 2 has ended, you can enter and fly with a normal airplane which is pressurized up to 3000 m.
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!
Suunto app
With the Suunto app, you can easily customize device and dive settings. See Customizing dive modes with Suunto app and How to customize dive modes with Suunto app .
You can also transfer your dive logs wirelessly to the app where you can follow and share your diving adventures.
To pair with Suunto app on iOS:
- Download and install Suunto app on your compatible Apple device from the App Store. The app description includes the latest compatibility information.
- Start Suunto app and turn on Bluetooth if it is not on already. Leave the app running in the foreground.
- If you have not yet set up your Suunto EON Steel Black , do so now (see Device setup ).
- Tap the watch icon in the upper left corner of the screen and tap on the ' + ' icon to add a new device.
- Select your dive computer from the list of found devices, tap PAIR .
- Enter the passkey shown on your dive computer display into the pairing request field on your mobile device.
- Tap PAIR at the bottom of the request field.
To pair with Suunto app on Android:
- Download and install Suunto app on your compatible Android device from Google Play. The app description includes the latest compatibility information.
- Start Suunto app and turn on Bluetooth if it is not on already. Leave the app running in the foreground.
- If you have not yet set up your Suunto EON Steel Black , do so now (see Device setup ).
- Tap the watch icon in the upper right corner of the screen.
- Select your dive computer from the list of found devices and tap PAIR .
- Enter the passkey shown on your dive computer display into the pairing request field on your mobile device.
- Tap PAIR at the bottom of the request field.
NOTE:
You cannot pair any device if airplane mode is on. Turn off airplane mode before pairing.
Synchronizing logs and settings
To be able to synchronize logs and settings, first you need to install Suunto app.
To download logs from your Suunto EON Steel Black and sync settings:
- Connect Suunto EON Steel Black to your mobile device via Bluetooth.
- Start Suunto app.
- Wait for the syncing to complete.
New dive logs appear in your activity history, sorted by date and time.
SuuntoLink
Use SuuntoLink to update the software of your Suunto EON Steel Black . Download and install SuuntoLink on your PC or Mac.
We strongly recommend updating your device when a new software release is available. If an update is available, you are notified via SuuntoLink and in the Suunto app.
Visit SuuntoLink for further information.
To update your dive computer software:
- Plug your Suunto EON Steel Black into the computer with the supplied USB cable.
- Start SuuntoLink if it is not already running.
- Click the update button in SuuntoLink.
TIP:
To sync your dives, connect the device to Suunto app before the software update.
Tank pressure
Your Suunto EON Steel Black can be used with the total number of twenty (20) gases per dive mode, each of which may have Suunto Tank POD for wireless tank pressure transmission.
To install and pair a Suunto Tank POD, see How to install and pair a Suunto Tank POD .
In tank pressure view, you can see the below screens.
The following example has the tank pressure alarm set to 100 bar. The tank pressure is 75 bar as indicated in the switch window in the bottom right corner.
Tank pressure is shown in yellow when it is over 50 bar (720 psi) and below the tank pressure alarm value set by the user:
When the tank pressure drops below 50 bar (720 psi), the actual tank pressure value is indicated in red in the switch window and a mandatory alarm is triggered:
Timer
Suunto EON Steel Black has a timer that can be used for timing specific actions during surface or dive. The timer is shown in the bottom right corner as a scrollable item.
NOTE:
In timer view, the timer is displayed as an analog watch.
To use the timer:
- Press the upper button to start the timer.
- Press the upper button again to pause the timer.
- Keep the upper button pressed to reset the timer.
Timer start and stop actions are saved in the dive log.
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 Black switches to dive state when water is detected. Dive starts
- when the water contact is on, at 1.2 m (4 ft), or
- when the water contact is not on, at 3.0 m (10 ft)
and ends
- when the water contact is on and your depth is less than 1.2 m (4 ft), or
- when the water contact is not on and your depth is at 3.0 m (10 ft).
When water contact is active, the color of the depth reading digits turns white.
