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Suunto Cobra2 Manual

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Suunto Cobra2Suunto SS012663000 Suunto Cobra 2 Air-Nitrox Air Integrated Computer
Suunto Cobra 2 Air/Nitrox Air Integrated Computer Console with Electronic Compass Watch . - 3 modes: Air - Matrix display - Digital compass with tilt-recognition ability - Automatic decompression calculations - Tracks remaining air pressure and air consumption rates - Audible and visual alarms - Provides digital dive profiling

Part Number: SS012663000
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DIVES THAT REQUIRE DECOMPRESSION STOPS ARE NOT RECOMMENDED. YOU SHOULD ASCEND AND BEGIN DECOMPRESSION IMMEDIATELY WHEN THE DIVE COMPUTER SHOWS YOU THAT A DECOMPRESSION STOP IS REQUIRED! Note the blinking ASC TIME symbol and the upward pointing arrow. USE BACK-UP INSTRUMENTS! Make sure that you use back-up instrumentation, including a depth gauge, submersible pressure gauge, timer or watch, and have access to decompression tables whenever diving with the dive computer. PERFORM PRE-CHECKS! Always activate and check the device before diving in order to ensure that all Liquid Crystal Display (LCD) segments are completely displayed, that the device has not run out of battery power, and that the oxygen, altitude, personal, Safety/Deep Stop, and RGBM adjustments are correct. 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 DCI. Review the recommendations given by Divers Alert Network (DAN) in Section 7.4. Flying after diving. 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. DO NOT DIVE WITH A CYLINDER OF ENRICHED AIR IF YOU HAVE NOT PERSONALLY VERIFIED ITS CONTENTS AND ENTERED THE ANALYZED VALUE INTO YOUR DIVE COMPUTER! Failure to verify cylinder contents and enter the appropriate O2% into your dive computer will result in incorrect dive planning information. THE DIVE COMPUTER WILL NOT ACCEPT FRACTIONAL PERCENTAGE VALUES OF OXYGEN CONCENTRATION. DO NOT ROUND UP FRACTIONAL PERCENTAGES! For example, 31.8% oxygen should be entered as 31%. Rounding up will cause nitrogen percentages to be understated and will affect decompression calculations. If you want to adjust the computer to provide more conservative calculations, use the personal adjustment feature to affect decompression calculations, or reduce the PO2 setting to affect oxygen exposure.

Contamination or dirt on the water contact may prevent this automatic activation. It is therefore important that the water contact is kept clean. The contact can be cleaned with fresh water and a soft brush, for example a tooth brush. 4.3. Learning how to use your compass Suunto Cobra2 integrates a digital compass, which can be used both while diving and on dry land, and can be accessed from either the DIVE mode or TIME mode.


When accessed from DIVE mode, toggle between the alternative displays by pressing the UP/DOWN buttons. In order to save battery power, the compass display will automatically return to the TIME or DIVE mode 60 seconds after the last buttonpress.
4.3.1. Compass display The Suunto Cobra2 displays the compass as a graphical representation of a compass rose. The rose displays the cardinal and half cardinal points, in addition to which, the current bearing is also displayed numerically. Tilt sensor The compass has a tilt sensor, so it doesn't have to be completely level in order to display o the correct bearing. As long as the device is held at an angle of +/- 5 to level, the compass will display the correct bearing. If the device is not held within this range, no bearing will be displayed.
4.3.2. Locking a bearing A bearing can be locked to help you follow a selected course, and directional arrows point towards the locked bearing. Locked bearings are stored in the memory for later analysis and are available the next time the compass is activated.
The Suunto Cobra2 also provides help for navigating square and triangular patterns, as well as navigating a return heading. This is made possible by following graphical symbols in the center of the compass display: Table 4.1. Locked bearing symbols Symbol Explanation You are traveling towards the locked bearing You are 90 (or 270) degrees from the locked bearing You are 180 degrees from the locked bearing You are 120 (or 240) degrees from the locked bearing 4.3.3. Compass settings You can define the compass settings (declination and calibration) when in COMPASS mode:

Declination You can compensate for the difference between true north and magnetic north by adjusting the compass declination. The declination can be found, for example, from sea charts or topographic maps of the local area.
Calibration Because of changes in the surrounding magnetic field, the Suunto Cobra2 electronic compass occasionally needs to be re-calibrated. During the calibration process, the compass adjusts itself to the surrounding magnetic field. As a basic rule, you should calibrate the compass whenever it doesnt seem to operate properly, or after replacing the dive computer's battery. Strong electromagnetic fields, such as powerlines, stereo speakers, and magnets can affect the compass calibration. It is therefore advisable to calibrate the compass if your Suunto Cobra2 has been exposed to these fields. NOTE NOTE When traveling overseas, it is recommended that you recalibrate the compass at the new location before using it. Remember to hold the Suunto Cobra2 level during the calibration process.
To calibrate the compass:
If the calibration fails several times in a row, it is possible that you are in an area with sources of magnetism, such as large metal objects, powerlines or electric appliances. Move to another location and try to calibrate the compass again. If the calibration continues to fail, contact an authorized Suunto service center.


Do not attempt to use the dive computer without reading this user's manual in its entirety, including all the warnings. Make sure that you fully understand the use, displays, and limitations of the instrument. If you have any questions about the manual or the Suunto Cobra2 please contact your Suunto representative before diving with the dive computer. Always remember that YOU ARE RESPONSIBLE FOR YOUR OWN SAFETY! When used properly, Suunto Cobra2 is an outstanding tool for assisting properly trained, certified divers in planning and executing sport dives. It is NOT A SUBSTITUTE FOR CERTIFIED SCUBA INSTRUCTION, including training in the principles of decompression. WARNING Diving with enriched air mixtures (nitrox) exposes you to risks that are different from those associated with diving with standard air. These risks are not obvious, and require training to understand and avoid. Risks include possible serious injury or death.
Do not attempt to dive with any gas mix other than standard air without first receiving certified training in this specialty. 5.1. The Suunto RGBM/Deep Stop Algorithm Suuntos Reduced Gradient Bubble Model (RGBM), utilized in the Suunto Cobra2, predicts both dissolved and free gas in the blood and tissues of divers. It is a significant advance on the classic Haldane models, which do not predict free gas. The advantage of Suunto RGBM is additional safety through its ability to adapt to a variety of situations and dive profiles. The Suunto Cobra2 uses traditional recommended safety stops as well as deep stops.

Three beeps with a three second interval and activated backlight Continuous beeps and activated backlight
No-decompression dive turns into a decompression stop dive. An arrow pointing upwards and the blinking ascent warning ASC TIME will appear. Maximum allowed ascent rate, 10 m per min/33 ft per min, is exceeded. Ascent rate bar graph blinks and STOP warning appears. Decompression ceiling depth is exceeded. An error warning Er and a downward pointing arrow appear. You should immediately descend to, or below, the ceiling. The instrument will otherwise enter a permanent Error mode within three minutes, indicated by a permanent Er.
You can set alarms for maximum depth, dive time and tank pressure. See also Section 5.8. DIVE mode settings and Section 4.1. TIME mode settings. Table 5.2. Preset alarm types Alarm type
Continuous beep series for 24 seconds Preset maximum depth is Maximum depth blinks as long as the current depth value reached. exceeds the preset value. Continuous beep series for 24 seconds or until any button is pressed. Dive time blinks for one minute. Preset dive time is reached.
Alarm type Current time is shown Continuous beep series for 24 seconds or until any button is pressed. Current time blinks for one minute Table 5.3. Oxygen alarms in NITROX mode Alarm type
Alarm reason Preset alarm time is reached.
Continuous beeps for 3 minutes Set oxygen partial pressure limit is exceeded. The and activated backlight alternative display is replaced with a current blinking PO2 value. You should immediately ascend above the PO2 depth limit. OLF value reaches 80%. The OLF value will start to blink. OLF value reaches 100%. The OLF value will blink. NOTE WARNING When the backlight is turned OFF, it does not illuminate when an alarm is activated. WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE MAXIMUM LIMIT IS REACHED, YOU MUST IMMEDIATELY ASCEND UNTIL THE OLF VALUE STOPS BLINKING. Failure to take action to reduce oxygen exposure after the warning is given can rapidly increase the risk of oxygen toxicity, injury, or death.
5.6. Error conditions The dive computer has warning indicators that alert you to react to certain situations that would significantly increase the risk of DCI. If you do not respond to its warnings, the dive computer will enter an Error mode, indicating that the risk of DCI has greatly increased. If you understand the dive computer and operate it sensibly, it is very unlikely you will ever put the instrument into the Error mode. Omitted decompression The Error mode results from omitted decompression, i.e. when you stay above the ceiling for more than three minutes. During this three-minute period the Er warning is shown and the audible alarm beeps. After this, the dive computer will enter a permanent Error mode. The instrument will continue to function normally if you descend below the ceiling within this three-minute period. Once in the permanent Error mode, only the Er warning is shown in the center window. The dive computer will not show times for ascent or stops. However, all the other displays will function as before to provide information for ascent. You should immediately ascend to a depth of 3 to 6 m/10 to 20 ft and remain at this depth until air supply limitations require you to surface. After surfacing, you should not dive for a minimum of 48 hours. During the permanent Error mode, the Er text will be displayed in the center window and the planning mode will be disabled. 5.7. Air integration The Cobra2 can be attached to the high-pressure port of the regulator, enabling you to receive cylinder pressure and remaining air time data. 18

5.9.5. Personal adjustments There are personal factors that can affect your susceptibility to DCI, which you can predict in advance, and input into the decompression model. Such factors vary between divers and also for the same diver from one day to another. The three-step Personal Adjustment setting is available if a more conservative dive plan is desired and, for very experienced divers, a two step adjustment for RGBM effect on repetitive dives is available. The personal factors which tend to increase the possibility of DCI include, but are not limited to: cold exposure - water temperature less than 20 C/68 F below average physical fitness level fatigue dehydration previous history of DCI stress obesity This feature is used to adjust the computer to be more conservative, according to personal preference, by entering the suitable Personal Adjustment setting with the help of Table 5.5, Personal Adjustment settings. In ideal conditions, retain the default setting, P0. If conditions are more difficult, or any of the factors which tend to increase the possibility of DCI exist, select P1, or even the most conservative P2. The dive computer then adjusts its mathematical model according to the entered Personal Adjustment setting, giving shorter no-decompression times (see Section 9.2.2. No-decompression limits, Table 9.1, Nodecompression time limits for various depths (m) and Table 9.2, No-decompression time limits for various depths (ft) ).
Table 5.5. Personal Adjustment settings Personal Condition adjustment value P0 P1 P2 Ideal conditions

Desired tables

Some risk factors or conditions exist Progressively more conservative Several risk factors or conditions exist
The Suunto Cobra2 also allows experienced divers who are willing to accept a greater level of risk to adjust the RGBM model. The default setting is 100%, which gives full RGBM effect. Suunto strongly advises you to use full RGBM effect. Statistically, very experienced divers have less incidents with DCI. The reason for this is unknown, but it is possible that some level of physiological and/or psychological accommodation can take place when you are very experienced as a diver. Thus, for certain divers and diving conditions, it may be desirable to set attenuated (50%) RGBM mode. See Table 5.6, RGBM model settings. Table 5.6. RGBM model settings RGBM setting Desired Tables 100% 50%


Standard Suunto RGBM model Full RGBM effects (Default) Attenuated RGBM model Smaller RGBM effects, higher risk!
5.10. Safety Stops Safety Stops are widely considered good diving practice for recreational diving, and are an integral part of most dive tables. The reasons for performing a Safety Stop include: reducing sub-clinical DCI, microbubble reduction, ascent control, and orientation before surfacing. The Suunto Cobra2 displays two different types of Safety Stops: Recommended Safety Stop and Mandatory Safety Stop. 5.10.1. Recommended Safety Stops With every dive over 10 meters, there is a three minute countdown for the Recommended Safety Stop, to be taken in the 6 - 3 m/10 ft - 20 ft range. This is shown with the STOP sign and a three-minute countdown in the center window instead of the no-decompression time.



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). Continuous ascent rate violations will result in Mandatory Safety Stops. When Recommended Deep Stop is enabled, the length is indicated in seconds.
6.1.5. Safety Stops A 3 minute Recommended Safety Stop is prompted after every dive to over 10m. 6.1.6. Decompression dives When your NO DEC TIME becomes zero, your dive becomes a decompression dive so you must perform one or more decompression stops on your way to the surface. The NO DEC TIME on your display will be replaced by an ASC TIME, and a CEILING notation will appear. An upward pointing arrow will also prompt you to start your ascent. If you exceed the no-decompression limits on a dive, the dive computer will provide the decompression information required for ascent. After this, the instrument will continue to provide subsequent interval and repetitive dive information. Rather than requiring you to make stops at fixed depths, the dive computer lets you decompress within a range of depths (continuous decompression). The ascent time (ASC TIME) is the minimum amount of time needed to reach the surface in a decompression dive. It includes: the time needed to ascend to the ceiling at an ascent rate of 10 m per minute/33 ft per minute. The ceiling is the shallowest depth to which you should ascend the time needed at the ceiling 28
the time needed at the Mandatory Safety Stop (if any) the time needed to reach the surface after the ceiling and Safety Stops have been completed YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN DISPLAYED BY THE INSTRUMENT! The ascent time will increase if you: remain at depth ascend slower than 10 m/33 ft per minute make your decompression stop deeper than at the ceiling These factors will also increase the amount of air required to reach the surface.
Ceiling, ceiling zone, floor and decompression range When in decompression, it is important that you understand the meaning of ceiling, floor, and decompression range. The ceiling is the shallowest depth to which you should ascend when in decompression. At this depth, or below, you must perform all stops The ceiling zone is the optimum decompression stop zone. It is the zone between the minimum ceiling and 1.8 m/6 ft below the minimum ceiling The floor is the deepest depth at which the decompression stop time will not increase. Decompression will start when you pass this depth during your ascent The decompression range is the depth range between the ceiling and floor. Within this range, decompression takes place. However, it is important to remember that the decompression will be very slow at, or close to, the floor

The depth of the ceiling and floor will depend on your dive profile. The ceiling depth will be fairly shallow when you enter the decompression mode, but if you remain at depth, it will move downward and the ascent time will increase. Likewise, the floor and ceiling may change upwards while you are decompressing. When conditions are rough, it may be difficult to maintain a constant depth near the surface. In such cases, it is more manageable to maintain an additional distance below the ceiling, to make sure that the waves do not lift you above the ceiling. Suunto recommends that decompression takes place deeper than 4 m/13 ft, even if the indicated ceiling is shallower. NOTE WARNING It will take more time and more air to decompress below the ceiling than at the ceiling. 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.
Display below the floor The blinking ASC TIME and an upward pointing arrow indicate that you are below the floor. You should start your ascent immediately. The ceiling depth is shown on the left side, and the minimum total ascent time on the right side, of the center window. Below is an example of a decompression dive without Deep Stops, below the floor. 29
Display above the floor When you ascend above the floor, the ASC TIME display stops blinking and the upward pointing arrow disappears. Below is an example of a decompression dive above the floor.
Decompression will now begin, but is very slow. You should therefore continue your ascent. Display at the ceiling zone When you reach the ceiling zone, the display will show you two arrows pointing at each other (the hour glass icon). Below is an example of a decompression dive at the ceiling zone.
During the decompression stop, ASC TIME will count down towards zero. When the ceiling moves upwards, you can ascend to the new ceiling. You may surface only after the ASC TIME and CEILING labels have disappeared, which means that the decompression stop and any Mandatory Safety Stop have been completed. You are advised, however, to stay until the STOP sign has also disappeared. This indicates that the three minute Recommended Safety Stop has also been completed. Display above the ceiling If you ascend above the ceiling during a decompression stop, a downward pointing arrow will appear and a continuous beeping starts.

In addition, an Error warning (Er) reminds you that you have only three minutes to correct the situation. You must immediately descend to, or below, the ceiling. If you continue to violate the decompression, the dive computer will go into a permanent Error Mode. In this mode, the instrument can only be used as a depth gauge and timer. You must not dive again for at least 48 hours. (See Section 5.6. Error conditions).
6.2. Diving in NITROX mode (DIVEnitrox) NITROX mode (DIVEnitrox) is the second dive mode available in Suunto Cobra2 and is used when using oxygen- enriched gas mixtures. 6.2.1. Before diving in NITROX mode If set to the NITROX mode, the correct oxygen percentage of the gas in your cylinder must always be entered into the computer to ensure correct nitrogen and oxygen calculations. The dive computer adjusts its mathematical nitrogen and oxygen calculation models accordingly. The dive computer will not accept fractional percentage values of oxygen concentration. Do not round up fractional percentages. For example, 31.8% oxygen should be entered as 31%. Rounding up will cause nitrogen percentages to be understated and will affect decompression calculations. If you want to adjust the computer to provide more conservative calculations, use the personal adjustment feature to affect decompression calculations, or reduce the PO2 setting to affect oxygen exposure according to the entered O2% and PO2 values. Calculations based on nitrox use result in longer no-decompression times and shallower maximum depths than diving with air. As a safety precaution, the oxygen calculations in the computer are made with an oxygen percentage of 1% + set O2%. When the dive computer is set in NITROX mode, the Dive Planning mode calculates using the O2% and PO2 values that are currently in the computer. To set the nitrox mixes, refer to Section 5.8.3. Setting the nitrox values. Default nitrox settings In NITROX mode, the Suunto Cobra2 allows you to set 1 or 2 nitrox mixes containing 2199% oxygen. In the NITROX mode, the default setting for MIX1 is standard air (21% O2). It remains in this setting until the O2% is adjusted to any other percentage of oxygen (22% - 99%). The default setting for maximum oxygen partial pressure is 1.4 bar, however you are able to set it in the range of 0.5 - 1.6 bar. MIX2 is set to OFF by default. To set MIX2 , refer to Section 6.2.4. Gas change and multiple breathing gas mixes. Oxygen percentages and maximum oxygen partial pressures for MIX2 are stored permanently. 6.2.2. Oxygen displays When NITROX mode is activated, the display will show the information in the figure below. In NITROX mode, the maximum operational depth is calculated based on set O2% and PO2 values.

If set to NITROX mode, the Suunto Cobra2 will additionally show on the alternative display: the oxygen percentage, labeled O2% the set oxygen partial pressure limit, labeled PO2 the current oxygen toxicity exposure, labeled OLF maximum depth current time water temperature dive time tank pressure 31
6.2.3. Oxygen limit fraction (OLF) If set to NITROX mode, in addition to tracking the diver's exposure to nitrogen, the instrument tracks the exposure to oxygen. These calculations are treated as entirely separate functions. The dive computer calculates separately for Central Nervous System oxygen toxicity (CNS) and Pulmonary Oxygen toxicity, the latter measured by the addition of Oxygen Toxicity Units (OTU). Both fractions are scaled so that the maximum tolerated exposure for each is expressed as 100%. The Oxygen Limit Fraction (OLF) displays only the value of the higher of the two calculations. The oxygen toxicity calculations are based on the factors listed in Section 9.3 Oxygen exposure. 6.2.4. Gas change and multiple breathing gas mixes The Suunto Cobra2 allows gas changes to enabled gas mixes during the dive. Gas changes are made by following the procedure below:
Mix number, O2%, and PO2 for the mixes are shown when scrolling. If the set PO2 limit is exceeded , it will be shown with the PO2 value blinking. The dive computer does not allow you to change to a gas whose set PO2 is exceeded. In such a case, the mix is shown but cannot be selected. If no button is pressed in 15 seconds, the dive computer will go back to the dive display without changing the gas mix. Upon ascent, the computer prompts you to change gas when the PO2 level you have set for the next mix allows a gas change. The prompt is an audible 3 beeps and the current O2 mix starts to blink.
6.3. Diving in GAUGE mode (DIVEgauge) If set to GAUGE mode, the dive computer can be used as a bottom timer. 32
In the GAUGE mode, the total dive time is always displayed in minutes in the lower right corner. In addition, a Dive Timer in the center window displays time in minutes and seconds. The center window Dive Timer is activated at the start of the dive and it can be reset during the dive and used as a stopwatch by pressing the SELECT button.

dive start time (year, month, day and time) dive computer settings oxygen percentage settings and maximum OLF (in NITROX mode) tissue calculation data real-time water temperature additional dive information (e.g. SLOW and Mandatory Safety Stop violations, Diver Attention Symbol, Bookmark, Surfaced Mark, Decompression Stop Mark, Ceiling Error Mark, Gas Change) dive computer serial number personal information (30 characters) Using SDM, you are able to enter setup options such as: input a personal, 30-character field into the Suunto Cobra2 reset the Dive Historys maximum depth to zero It is also possible to manually add comments, multimedia and other personal information to the PC-based dive data files. 7.8. and Suunto Diving World at When you have dived and transferred your dive data to your Suunto Dive Manager, you can share your best experiences with other diving enthusiasts at It's a free and open Internet community where you can compare your underwater experiences with other Suunto users and learn from each other. includes three sections. In My Suunto you can register your dive computer and manage your membership profile. The section also contains a personal event calendar. The Communities section is meeting a place for smaller groups of members. Here you can create and manage your own communities and search for others. All communities have a home page that lists the latest group activities. Community members can also use group-specific bulletin boards and calendars, create their own link lists and group activities. All registered users automatically become members of the World of Suunto Sports community. The Sport forums include sport-specific news, bulletin boards, event calendars, ranking lists and discussions. You can also exchange experiences and read travel reports written by other members. To learn more about SuuntoSports.coms functions and activities, visit the site, try them and, if necessary, use the site Help. The Help is available on the right side of the bar that divides the screen.


The Suunto Cobra2 dive computer is a sophisticated precision instrument. Though designed to withstand the rigors of scuba diving, you must handle your Suunto Cobra2 with care, and follow the advice below on how to maximize its service life. 8.1. Water contacts and buttons Contamination or dirt on the water contacts/connector or buttons may prevent the automatic activation of the DIVE mode and cause problems during data transfer. Therefore, it is important that the water contacts and push buttons are kept clean. If the water contacts of the instrument are active (AC-text remains on the display) or the DIVE mode activates on its own, the reason is probably contamination or invisible marine growth that may create an unwanted electric current between the contacts. It is important that the dive computer is carefully washed in fresh water after the day's diving is completed. The contacts can be cleaned with fresh water and, if necessary, a mild detergent and a soft brush. 8.2. Care of your dive computer NEVER try to open the case of the dive computer Have your dive computer serviced every two years or after 200 dives (whichever comes first) by an authorized Suunto representative. This service will include a general operational check, replacement of the battery, and a water resistance check. The service requires special tools and training, so do not attempt to carry out any service that you are not competent to perform If moisture appears inside the case, have the instrument checked immediately by your Suunto representative If you detect scratches, cracks or other such flaws on the display that may impair its durability, have it replaced immediately by your Suunto representative Check the strap and the buckle for flaws. If needed, have them replaced by your Suunto representative Wash and rinse the unit in fresh water after every use Protect the unit from shock, extreme heat, direct sunlight, and chemical corrosion. The dive computer cannot withstand the impact of heavy objects like scuba cylinders, nor chemicals like gasoline, cleaning solvents, aerosol sprays, adhesive agents, paint, acetone, alcohol etc. Chemical reactions with such agents will damage seals, the case, and the finish Store your dive computer in a dry place when you are not using it The dive computer displays a battery symbol as a warning when the power gets too low. When this happens, the instrument should not be used until the battery has been replaced. Also refer to Section 5.9. Activation and pre-checks Do not fasten the strap of your dive computer too tightly. You should be able to insert your finger between the strap and your wrist 8.3. Maintenance If left without care for an extended period, a thin film, often invisible to the naked eye, will cover the unit. Much like the build-up on the glass of an aquarium, this film is the result of organic contaminants found in both salt and fresh water. Suntan oil, silicone spray and grease will speed up this process. As a result of this build-up, moisture will be trapped next to the water contacts and will prevent your Suunto Cobra2 from operating properly. The water contacts can be cleaned with a small brush (e.g. toothbrush). IMPORTANT: Your Suunto Cobra2 should be soaked, then thoroughly rinsed with fresh water and dried with a soft towel after each dive. Make sure that all salt crystals and sand particles have been flushed out. Check the display for possible moisture or water, and do not use the Suunto Cobra2 if you detect any moisture or water inside.


Do not use compressed air to blow water off the unit. Do not use solvents or other cleaning fluids that might cause damage. Do not test or use the dive computer in pressurized air.
8.4. Water resistance inspection The water resistance of the unit must be checked after replacing the battery or after other service operations. The check requires special equipment and training. You must frequently check the display for any sign of leaks. If you find moisture inside your dive computer, there is a leak. A leak must be corrected without delay, as moisture will seriously damage the unit, even beyond repair. Suunto does not take any responsibility for damage caused by moisture in the dive computer, if the instructions of this manual have not been carefully followed. In the event of a leak, immediately take the dive computer to an authorized Suunto representative. 8.5. Battery replacement NOTE It is advisable to contact an authorized Suunto representative for battery replacement. It is imperative that the change is made in a proper manner to avoid any leakage of water into the battery compartment or computer. Defects caused by improper battery installation are not covered by the warranty. When the battery is changed, all nitrogen and oxygen uptake data is lost. Therefore, the no-fly time shown by the computer should have reached zero or you must wait for 48 hours, or preferably up to 100 hours, before you dive again.


All history and profile data, as well as the altitude, personal, and alarm settings, will remain in the dive computer memory after the battery change. However, the clock time and time alarm settings are lost. In the NITROX Mode, the nitrox settings also revert back to default settings (MIX% O2, 1.4 bar PO2, MIX2 OFF). When working with the battery compartment, cleanliness is extremely important. Even the smallest dirt particles may cause a leakage when you dive. 8.5.1. Battery kit The battery kit includes a 3.0 V coin type lithium cell battery and a lubricated Oring. When handling the battery do not make contact with both of the poles at the same time. Do not touch the surfaces of the battery with your bare fi ngers. 8.5.2. Required tools A Philips-head screwdriver. Soft cloth for cleaning. Needlenose pliers or small screwdriver for turning securing ring. 8.5.3. Battery replacement procedure The battery and the buzzer are located in the back of the instrument in a separate compartment. To change the battery, follow the procedure below: 1. Unscrew the four screws at the back of the elastomer console and remove the back cover of the console. 2. Thoroughly rinse and dry the computer. 41
6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.
Open the securing ring of the battery compartment lid by pushing it down and rotating it clockwise. You may use a pointed nose pliers or a small screwdriver as an aid in the rotating. Put the pliers ends into the holes of the securing ring or the screwdriver onto the side of the right tooth on the ring and turn the ring clockwise. Be careful not to damage any of the parts. Remove the ring. Carefully remove the lid with the beeper attached to it. You can remove the lid by pressing with your finger on the outermost edge of the lid while simultaneously pulling with your nail at the opposite side. Don't use sharp metal objects as they might damage the O-ring or the sealing surfaces. Remove the O-ring and the battery retainer. Carefully remove the battery. Do not damage the electrical contacts or the sealing surface. Check for any traces of flooding, particularly between the beeper and the lid, or for any other damage. In case of a leak or any other damage, bring the dive computer to an authorized SUUNTO dealer or distributor for check and repair. Check the condition of the O-ring; a defective O-ring may indicate sealing or other problems. Dispose the old O-ring, even if it seems to be in good condition. Check that the battery compartment, battery holder and lid are clean. Clean with soft cloth if necessary. Reinstall the battery retainer in its correct position. Check that the new lubricated O-ring is in good condition. Put it in the right position on the battery compartment lid. Be very careful not to get any dirt on the o-ring or its sealing surfaces. Carefully press the lid onto the battery compartment with your thumb, while making sure that the O-ring is not at any point protruding out on the edge. Put your other thumb through the locking ring. Press this thumb firmly against the lid and release the other one. Make sure that the lid is pressed completely down! Turn the locking ring counterclockwise with your free thumb and fingers until it snaps into its locked position. The dive computer should now active its timekeeping mode and show time 18:00 [6:00 PM] and date SA 01,01. Activate the instrument. Check that all display segments work. the low battery warning is off. the buzzer beeps and backlight works. all the settings are correct. Reset if necessary. Reassemble computer into the console. The instrument is now ready for use. Check after the first dives for possible moisture under the transparent battery compartment lid, indicating a leak.

Table 9.2. No-decompression time limits for various depths (ft) No-decompression time limits (mins) for various depths (ft) for the first dive of a series Depth (ft) Personal Mode / Altitude Mode P0/A0 -P0/AP0/AP1/AP1/AP1/AP2/AP2/AP2/A7 6
No-decompression time limits (mins) for various depths (ft) for the first dive of a series Depth (ft) Personal Mode / Altitude Mode P0/A6 P0/A5 P0/A4 P1/A5 P1/A4 P1/A4 P2/A4 P2/A4 P2/A3
9.2.3. Altitude diving The atmospheric pressure is lower at high altitudes than at sea level. After traveling to a higher altitude, you will have additional nitrogen in your body, compared to the equilibrium situation at the original altitude. This "additional" nitrogen is released gradually over time and equilibrium is restored. It is recommended that you acclimatize to a new altitude by waiting at least three hours before making a dive. Before high-altitude diving, the instrument must be set to the Altitude Adjustment mode to adjust the calculations for the new altitude. The maximum partial pressures of nitrogen allowed by the mathematical model of the dive computer are reduced according to the lower ambient pressure. As a result, the allowed no-decompression-stop limits are considerably reduced. 9.3. Oxygen exposure The oxygen exposure calculations are based on currently accepted exposure time limit tables and principles. In addition to this, the dive computer uses several methods to conservatively estimate the oxygen exposure. For example: the displayed oxygen exposure calculations are raised to the next higher percentage value for recreational scuba diving, the recommended upper limit of 1.4 bar PO2 is used as a default the CNS % limits up to 1.6 bar 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 will be shown before and during a dive when the computer is set in NITROX mode: the selected O2% on the alternative display OLF% alternative display for either CNS% or OTU% (whichever is larger) audible alarms are given and the OLF value starts to blink when the 80% and 100% limits are exceeded audible alarms are given and the actual PO2 value blinks when it exceeds the preset limit in dive planning, the maximum depth according to the O2% and maximum PO2 selected
10.1. Copyright This user's manual is copyrighted and all rights are reserved. It may not, in whole or in part, be copied, photocopied, reproduced, or translated to any media without prior written consent from Suunto. 10.2. Trademark Suunto, Cobra2, Consumed Bottom Time (CBT), Oxygen Limit Fraction (OLF), Suunto Reduced Gradient Bubble Model (RGBM), and Continuous Decompression and their logos are all registered or unregistered trademarks of Suunto. All rights are reserved. 10.3. Patent notice This product is protected by the following patents and patent applications: US 5,845,235 and US11/152,075. Other patents have been applied for.


NOTE Warranty arrangements vary from country to country. The dive computer packaging contains information regarding the warranty benefits and requirements applicable to your purchase.
This Suunto dive computer is warranted against defects in workmanship and materials for a period of two years after purchase to the original owner subject to and in accordance with the terms and conditions set forth below: The dive computer should be serviced and repaired only by an authorized Suunto representative. This warranty does not cover damage to the product resulting from improper usage, improper maintenance, neglect of care, alteration or unauthorized repair. This warranty will automatically become void if proper preventive maintenance procedures have not been followed as outlined in the use and care instructions for this product. All implied warranties, including but not limited to the implied warranties of merchantability and fitness for a particular purpose, are limited from the date of purchase and in scope to the warranties expressed herein. Suunto shall not be liable for loss of use of the product or other incidental or consequential costs, expenses or damage incurred by the purchase. All warranties not stated herein are expressly disclaimed. Some states do not allow the exclusion or limitation of implied warranties of consequential damages, so the above exclusions or limitations may not apply to you. This warranty gives you specific legal rights, and you may also have other rights that vary from state to state. This warranty does not cover any representation or warranty made by representatives beyond the provisions of this warranty. No Suunto representative is authorized to make any modifications to this warranty or to make any additional warranty. Battery replacement is not covered by this warranty. This User's Guide should be kept with your dive computer. Suunto's dive computers and wristop computers can be registered online at Registering your unit makes it quicker and easier for us to help you if you ever need to send your product for servicing, or if you need information about using your unit from our Global Help Desk.
Please dispose of the device in an appropriate way, treating it as electronic waste. Do not throw it in the garbage. If you wish, you may return the device to your nearest Suunto representative.


Air time Altitude dive Ascent rate ASC RATE Ascent time ASC TIME Ceiling Ceiling zone The amount of dive time remaining, based on a calculation of cylinder pressure and ambient pressure and present air consumption. A dive made at an elevation greater than 300 m/1000 ft above sea level. The speed at which the diver ascends toward the surface. Abbreviation for ascent rate. The minimum amount of time needed to reach the surface on a decompression stop dive. Abbreviation for ascent time. On a decompression stop dive, the shallowest depth to which a diver may ascend based on computed nitrogen load. On a decompression stop dive, the zone between the ceiling and the ceiling plus 1.8 m/6 ft. This depth range is displayed with two arrows pointing toward each other (the hour glass icon). Toxicity caused by oxygen. Can cause a variety of neurological symptoms. The most important of which is an epileptic-like convulsion which can cause a diver to drown. Abbreviation for central nervous system toxicity. Central nervous system toxicity limit fraction. Also note Oxygen Limit Fraction See "Tissue group". Abbreviation for Divers Alert Network. Abbreviation for decompression illness. Time spent at a decompression stop, or range, before surfacing, to allow absorbed nitrogen to escape naturally from tissues On a decompression stop dive, the depth range between the floor and the ceiling within which a diver must stop for some time during ascent. Any of a variety of maladies resulting either directly or indirectly from the formation of nitrogen bubbles in tissues or body fluids, as a result of inadequately controlled decompression. Commonly called "the bends" or "DCI". A group of repetitive dives between which the dive computer indicates some nitrogen loading is present. When nitrogen loading reaches zero the dive computer deactivates. Elapsed time between leaving the surface to descend, and returning to the surface at the end of a dive. Delta P, describing the Cylinder Pressure drop during the dive; the difference in cylinder pressure between the beginning and end of a dive. Abbreviation for equivalent air depth. Abbreviation for enriched air nitrox. Also called nitrox or Enriched Air = EANx. Air that has some oxygen added. Standard mixes are EAN32 (NOAA Nitrox I = NN I) and EAN36 (NOAA Nitrox II = NN II). Nitrogen partial pressure equivalent table. The deepest depth during a decompression stop dive at which decompression takes place. After a change in ambient pressure, the amount of time required for the partial pressure of nitrogen in a theoretical compartment to go half way from its previous value to saturation at the new ambient pressure. Abbreviation for high pressure (= cylinder pressure).


DIY - PC - Interface for Suunto Cobra/Vyper/Vytec/Mosquito/D3
Summary This document is the distinct consequence of the Spyder/Stinger ACW interface DIY. After having many e-mails concerning the application for the above mentioned computers I finally decided to develop a prototype and then a small series of these interfaces. For the electronics the schematic from the ACW interface could be used. The mechanical concept needed a complete redesign. For the contacts in the plug I wanted to use the proven concept with spring-loaded contact probes because I got absolutely no complaints about the reliability of the data transfer, which is obviously a result of the outstanding performance of these contacts. For the rest of the mechanical design I wanted to have a concept that fits to all of the five computer models Cobra/Vyper/Vytec/Mosquito/D3. I think that the design described in this document can easily be rebuilt for people skilled in doing home mechanics and handicrafts in electronics. Note: The circuit described here has proven to be reliable and safe. A correct assembled device will never harm the dive computer nor the PC it is attached to. However I do not take any responsibility for any kind of damage. If you decide to rebuild this unit, its on your own risk.
PC-Interface Cobra/Vyper/Mosquito by Roli 2001/2002

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Circuit description
The circuit generally consists of two level shifters. The power is taken from the output signal lines DTR and TXD. One thing I have noticed a while ago is that the DTR line is forced high during the whole communication process. I decided to use this line for the positive supply. A second fact is that the output RXD has to be low only when the input TXD is low. So I decided to use the TXD line for the negative supply of the RXD level shifter. R1, R2, D1 and Q1 form a simple controlled current source. The current (about 120 microamps) produces a voltage drop of around 2.6 Volts across R3 when the TXD line is high. The voltage on R4 is limited by the B-E junction of Q2 to about 0.6 Volts. The sum corresponds to the logic-high level of -3.2 Volts for the D I/O contact of the dive computer. Q2, Q3, D3, R5 and R6 form a level shifter from the dive computer logic levels to RS232 levels. When the voltage drop across R3, R4 is more than about 1.5 Volts the RXD line is pulled high by Q2. With no voltage drop across R3, R4 and if the TXD is low the RXD line is pulled low by Q3. D3 is to protect the B-E junction of Q3 from being reverse biased and R5 serves to protect the circuit from damage due to shorting or miswiring RXD. A few words about D2 and D4: Sometimes, especially before the PC software takes control over the RS323 port and after terminating the communication the DTR line can be low. D2 is to protect the circuit (and also the dive computer) from this condition. D4 is to ensure a defined function of the RXD level shifter even when the TXD signal level is higher than the DTR level. Otherwise the C-B junction of Q3 gets forward biased and the RXD output is defined via Q3 instead of Q2. Remark: To achieve perfect function even with signal voltages down to 2.5V (below RS232 specs but often used on PDA's) simply replace all diodes (including D1) with BAT48 Shottky and use R2 = 6.2k and R6 = 10k. Then add a LM385-1.2 bandgap voltage reference IC in parallel to D1 (see the spare traces on the PCB layout).

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PCB Artwork
Layout and placement of the components (both top view) and in 2 : 1 scale. The size of the PCB shown here fits into the housing specified in the parts list. It should be no problem to reproduce the PCB since it is only single sided and the trace width as well as the spacings are comfortable. If you want to use the above layout for reproduction don't forget to shrink it by 50%. Carefully note the orientation of the transistors on the layout which may be unconventional for the TO92 package. The square pad is the pin # 1 (left when seen from the front).

Parts List (The remarks in brackets are for easier finding equivalents) Electronics: QBC546 (NPN, 100mA) Q2, QBC556 (PNP, 100mA) DBZX55C4V3 (zener 4.3V 0.5W) D2.D1N4148 (100mA silicon diode) R10k R27k R3, R4, R22k R1k all resistors > 0.25W Others: Cable Connector Contacts 1 4-core, 1-2 meters 1 DB9 female 2 Feinmetall part-# F620.115.120.N.075 Plug part 1 see below PCB 1 see above Housing 1 Conrad part-# 74 Rubber band 1

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The Plug The plug consists of a support part to hold the spring contact probes and the contact probes themselves. Refer to the drawing below for the dimensions of the support piece.

2.0 10.0

5.8 2.2 1.6 1.8

1.6 4.2 11.2

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The Assembly

The above picture shows the PCB placed inside the housing. The solder ends of the spring contact probes extending from the plug are glued into two holes in the housing with epoxy resin. The PCB is held inside the housing with another drop of epoxy resin. I use two screws with nuts to wrap the rubber band around. You can see the openings in the other end of the housing for the cable and for the rubber band.
This picture shows the arrangement of the contacts on the back of the dive computer. The example is for the Vyper but it's the same on Mosquito, D3 and Cobra, too.

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Test Its favorable to test the circuit before putting it into operation. All you need is a dual output adjustable power supply (two series connected 9V batteries do the job, either) and a voltmeter. 1) Set DTR and TXD to +9V referred to GND. The voltage across the dive computer contacts should become around 3V and the voltage at RXD should be around +8V to GND. 2) Change TXD to 9V (keep DTR at +9V). The voltage across the dive computer contacts should become zero and the voltage at RXD should be around 8V. Are these tests successful, you can plug the interface to the PC and see if the Dive Manager software recognizes it by the test routine. Now you can perform your first data transfer. Pictures
That's it. Inspire yourself with the pictures and improve the design even more. If you e-mail me pictures of your designs, I could add them to this documentation or put them on my web page.

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In Case of Problems First of all there are no known problems with the PC-interface or the Suunto software. In most of the cases the problem with the data transfer is due to dirt on the water sensor contacts, improper COM-port selection or the "COM time delay" value is not suitable for the hardware used. Here are some hints & tips: When you often get the Transfer Timed Out error message, try the following: 1. Make sure that you have your PC-interface properly connected to your PC following the instructions of the program and the Help utility. Run the TEST utility from the Transfer Menu - PC Interface Setup window which should recognize the COM-port to which the PC-interface is connected to. Now make sure that this COM-port is the one you have selected. 2. You can set the "COM time delay" in the Interface Setup window of the Dive Manager program. The value depends on the hardware used (is it a powerful PC or not, and some other PC settings). It is advisable to experiment with different values and see which one works the best. A value between 10 and 50 should be appropriate for 95% of all computers. 3. The water sensor contacts are sometimes contaminated with dirt or corrosion, which usually causes problems with the data transfer. Carefully clean the PC-interface pins and the watersensor contacts of your computer with a soft eraser or dry cloth. 4. Attach your interface plug to the dive computer when you are asked to do so by the Dive Manager software, then switch the dive computer to the TR-PC mode. According to the program's Help, you should set your computer in TR-PC mode before attaching the PCinterface. However some users have good experiences when setting the computer in PC-TR mode after the interface is attached. 5. If you had an unsuccessful transmission just leave and re-enter the TR-PC mode (without removing the interface from the computer) to try again. Remark: On some dive computer models 4. and 5. don't work because the computer enters the Dive mode (when it is not yet in TR-PC mode) as soon as the interface is attached. 6. Do not move or touch your dive computer and interface while transmitting because any movements may interrupt the transfer and you have to start all over again.

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