Suunto Cobra2 User Manual
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Suunto Cobra2 User Manual

Suunto cobra2 diving instruments: user guide
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Summary of Contents for Suunto Cobra2

  • Page 3: Table Of Contents

    1. WELCOME TO THE WORLD OF SUUNTO DIVING INSTRUMENTS ... 5 2. WARNINGS, CAUTIONS, AND NOTES ... 6 3. SUUNTO Cobra2 AT A GLANCE ... 9 3.1. Navigating in the menus ... 9 3.2. Button symbols and functions ... 9 4.
  • Page 4 7.6. MEMORY mode ... 37 7.6.1. Dive logbook (MEMlogbook) ... 37 7.6.2. Dive history (MEMhistory) ... 38 7.7. Suunto Dive Manager (SDM) ... 38 7.8. www.suuntosports.com and Suunto Diving World at www.suunto.com/diving ... 39 8. CARE AND MAINTENANCE ... 40 8.1.

  • Page 5: Welcome To The World Of Suunto Diving Instruments

    1. WELCOME TO THE WORLD OF SUUNTO DIVING INSTRUMENTS Suunto Cobra2 was designed to help you get the most out of your diving. By reading this manual and becoming familiar with the functions of your dive computer, you can begin a new era in your diving.

  • Page 6: Warnings, Cautions, And Notes

    (DCI). Therefore, Suunto strongly recommends that the device is not used for any commercial or professional diving activities. ONLY DIVERS TRAINED IN THE PROPER USE OF SCUBA DIVING...
  • Page 7 DIVES THAT REQUIRE DECOMPRESSION STOPS ARE NOT WARNING RECOMMENDED. 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 WARNING instrumentation, including a depth gauge, submersible pressure gauge, timer or watch, and have access to decompression tables whenever...
  • Page 8 SELECT THE CORRECT ALTITUDE ADJUSTMENT SETTING! When WARNING diving at altitudes greater than 300 m/1,000 ft the Altitude Adjustment feature must be correctly selected in order for the computer to calculate the decompression status. The dive computer is not intended for use at altitudes greater than 3,000 m/10,000 ft.

  • Page 9: Suunto Cobra2 At A Glance

    3. SUUNTO COBRA2 AT A GLANCE 3.1. Navigating in the menus Suunto Cobra2 has four main operating modes - TIME mode (TIME), DIVE mode (DIVE), PLAN mode (PLAN), and MEMORY mode (MEMORY) – as well as the COMPASS submode, which can be activated from either TIME or DIVE modes. To toggle between the main modes, press the MODE button.
  • Page 10 Symbol Button Press Long DOWN Short DOWN Long Main functions Enable gas switching in NITROX mode Toggle between alternative displays Change submode Decrease values Enter Setting mode Toggle between ceiling and remaining air time display...

  • Page 11: Getting Started With Your Suunto Cobra2

    BEFORE getting into the water. 4.1. TIME mode settings The first thing you'll want to do with your Suunto Cobra2, is to set the TIME mode shortcuts: alarm, time, date, units, backlight, and tones. In this section, we look at how to do this.

  • Page 12: Setting The Units

    4.1.4. Setting the units In the UNITS SETTING mode you can choose to have the units displayed in either the metric or imperial system - meters/feet, Celsius/Fahrenheit etc. 4.1.5. Setting the backlight Use the BACKLIGHT SETTING mode to turn the backlight on or off and to define how long it stays on for (5, 10, 20, 30, or 60 seconds).

  • Page 13: Learning How To Use Your Compass

    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.

  • Page 14: Locking A 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.
  • Page 15 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 doesn’t seem to operate properly, or after replacing the dive computer's battery.

  • Page 16: Before Diving

    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.

  • Page 17: Nitrox

    5.4. Nitrox Diving with nitrox provides you with an opportunity to increase bottom times or reduce the risk of decompression illness by reducing the nitrogen content in the gas mix. However, when the gas mix is altered, the oxygen content of the mix is generally increased. This increase exposes the diver to an oxygen toxicity risk not usually considered in recreational diving.

  • Page 18: Error Conditions

    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. Alarm reason Preset alarm time is reached.

  • Page 19: Connecting Suunto Cobra2 To A Regulator

    Remove the high pressure (HP) port plug on the first stage of your regulator using an appropriate tool. Thread the high pressure hose of the Suunto Cobra2 into the HP port of your regulator with your fingers. Tighten the hose fitting with a 16 mm (5/8'') wrench. DO NOT OVERTIGHTEN! Attach the regulator to the scuba cylinder and slowly open the valve.

  • Page 20: Setting The Nitrox Values

    With a range of 1 - 999 minutes, the alarm can be set to your planned NOTE bottom time, for example. 5.8.3. Setting the nitrox values If set to the NITROX mode, the correct oxygen percentage of the gas in your cylinder (and additional gases) must always be entered into the computer to ensure correct nitrogen and oxygen calculations.

  • Page 21: Setting The Sample Rate

    5.9.1. Accessing DIVE mode The Suunto Cobra2 has three diving modes: AIR mode for diving with standard air only, NITROX mode for diving with oxygen enriched mixtures, and GAUGE mode for use as a bottom timer.

  • Page 22: Dive Mode Activation

    5.9.2. DIVE mode activation The dive computer activates automatically when submerged deeper than 0.5 m/1.5 ft. However, it is necessary to activate the DIVE mode BEFORE diving to check the altitude and personal adjustment settings, battery condition, oxygen settings etc. After activation, all display elements turn on showing mostly figure 8s and graphical elements, and the backlight and the beep are activated.

  • Page 23: Diving At Altitude

    5.9.4. Diving at altitude The dive computer can be adjusted both for diving at altitude and also to increase the conservatism of the mathematical nitrogen model. When programming the instrument for the correct altitude, you need to select the correct Altitude Adjustment settings according to Table 5.4, Altitude Adjustment settings.

  • Page 24: Safety Stops

    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.

  • Page 25: Mandatory Safety Stops

    The Suunto RGBM calculation model responds to this by adding a Mandatory Safety Stop to the dive. The time of this Mandatory Safety Stop depends on the severity of the ascent rate excess.

  • Page 26: Diving

    6. DIVING This section contains instructions on how to operate the dive computer and interpret its displays. You’ll find that this dive computer is easy to use and read. Each display shows only the data relevant to that specific diving mode. 6.1.

  • Page 27: Bookmark

    The bookmarks will also be shown as annotations in the downloadable Suunto Dive Manager PC software. The bookmark logs the depth, time, and water temperature, as well as compass heading (if the compass has been enabled).

  • Page 28: Ascent Rate Indicator

    Low Air Pressure Warnings The dive computer will warn you with three audible double beeps and a blinking pressure display when the cylinder pressure reaches 50 bar/725 psi. Three double beeps are also heard when the cylinder pressure goes down to the user- selected alarm pressure and when the remaining air time reaches zero.
  • Page 29 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.
  • Page 30 TIME AND AN ALARM TELL YOU TO ASCEND. MINIMUM TOTAL ASCENT TIME INCLUDING MANDATORY SAFETY STOP IS 15 MINUTES. CEILING IS AT 3 M. Display above the floor When you ascend above the floor, the ASC TIME display stops blinking and the upward pointing arrow disappears.

  • Page 31: Diving In Nitrox Mode (Divenitrox)

    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 21- 99% oxygen. In the NITROX mode, the default setting for MIX1 is standard air (21% O this setting until the O % is adjusted to any other percentage of oxygen (22% - 99%).

  • Page 32: Oxygen Limit Fraction (Olf)

    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, O...
  • Page 33 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.

  • Page 34: After Diving

    7.3. Repetitive dive planning The Suunto Cobra2 includes a dive planner that allows you to review the no-decompression limits on a subsequent dive, taking the residual nitrogen loading of previous dives into consideration.

  • Page 35: Flying After Diving

    Following any dive that required a decompression stop, flying should be delayed for at least 24 hours, and if possible, for 48 hours Suunto recommends that flying is avoided until all the DAN and UHMS guidelines, as • well as the dive computer’s no-fly conditions, are satisfied 7.5.

  • Page 36: Simulation Mode (Plansimulator)

    WHEN ENTERING THE MEMPLAN MODE THE DISPLAY FIRST BRIEFLY SHOWS TISSUE LOADING, THE REMAINING DESATURATION TIME BEFORE GOING INTO PLAN MODE. USE UP AND DOWN BUTTONS TO SCROLL DIFFERENT NO-DECOMPRESSION LIMITS. NO-DECOMPRESSION LIMITS LONGER THAN 99 MINUTES ARE DISPLAYED AS “–”. The Planning mode takes into account the following information from previous dives: any calculated residual nitrogen •...

  • Page 37: Memory Mode

    7.6.1. Dive logbook (MEMlogbook) The Suunto Cobra2 has a very sophisticated, high capacity Logbook and Profile Memory. The data is recorded in the profile memory based on the selected sample rate. The END OF LOGS text is displayed between the oldest and most recent dive. The following...

  • Page 38: Dive History (Memhistory)

    PC. You can then view and organize all the data recorded with your Suunto Cobra2. You can also plan dives, print copies of your dive profiles and upload your dive logs to share with your friends at SuuntoSports.com.

  • Page 39: Www.suuntosports.com And Suunto Diving World At Www.suunto.com/Diving

    PC-based dive data files. 7.8. www.suuntosports.com and Suunto Diving World at www.suunto.com/diving 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 SuuntoSports.com. It's a free and open Internet community where you can compare your underwater experiences with other Suunto users and learn from each other.

  • Page 40: Care And Maintenance

    8. CARE AND MAINTENANCE 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.

  • Page 41: Water Resistance Inspection

    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...
  • Page 42 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.

  • Page 44: Technical Data

    It is recommended that the instrument be stored in a dry place at room temperature. Do not leave the dive computer in direct sunlight! NOTE Tissue calculation model: • Suunto Deep Stop RGBM algorithm (developed by Suunto and Bruce R. Wienke, BSc, MSc, PhD) • 9 tissue compartments •...

  • Page 45: Rgbm

    It was developed in co- operation between Suunto and Bruce R. Wienke BSc, MSc, PhD. It is based on both laboratory experiments and diving data, including data from DAN.

  • Page 46: No-Decompression Limits

    When this is detected, in addition to adapting the decompression algorithm, the Suunto RGBM model will in some circumstances also advise, with the Diver Attention Symbol, that you extend your surface interval.

  • Page 47: Altitude Diving

    No-decompression time limits (mins) for various depths (ft) for the first Depth (ft) P0/A0 P0/A1 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.

  • Page 48: Intellectual Property

    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.

  • Page 49: Disclaimers

    11. DISCLAIMERS 11.1. User’s responsibility This instrument is intended for recreational use only. Suunto Cobra2 must not be used for obtaining measurements that require professional or industrial precision. 11.2. CE The CE mark is used to mark conformity with the European Union EMC directive 89/336/EEC FIOH, Laajaniityntie 1, FIN-01620 Vantaa, Finland, notified body no.0430, has EC type-...

  • Page 50: Warranty

    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.

  • Page 51: Disposal Of The Device

    13. DISPOSAL OF THE DEVICE 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.

  • Page 52: Glossary

    GLOSSARY Air time Altitude dive Ascent rate ASC RATE Ascent time ASC TIME Ceiling Ceiling zone Central nervous system toxicity CNS% Compartment Decompression Decompression range Decompression illness Dive series Dive time ΔP Enriched air nitrox Equivalent air depth Floor Half time The amount of dive time remaining, based on a calculation of cylinder pressure and ambient pressure and present air consumption.
  • Page 53 Abbreviation for oxygen tolerance unit. Used to measure the whole-body-toxicity. A term used by Suunto for the values displayed in the oxygen toxicity bar graph. The value is either the CNS% or the OTU%. Oxygen percentage or oxygen fraction in the breathing gas. Standard air has 21% oxygen.

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