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. GETTING STARTED WITH YOUR SUUNTO Cobra2 ..............................
6.2. Diving in NITROX mode (DIVEnitrox) ............................................... 6.2.1. Before diving in NITROX mode ................................................ 6.2.2. Oxygen displays ................................................................. 6.2.3. Oxygen limit fraction (OLF) ..................................................... 6.2.4. Gas change and multiple breathing gas mixes ............................... 6.3. Diving in GAUGE mode (DIVEgauge) ........................................
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.
2. WARNINGS, CAUTIONS, AND NOTES Throughout this manual, important safety icons are displayed.
WARNING 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. WARNING 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.
WARNING SELECT THE CORRECT ALTITUDE ADJUSTMENT SETTING! When 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. Failure to select the correct Altitude Adjustment setting, or diving above the maximum altitude limit will result in erroneous dive and planning data.
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. To select a submode in DIVE, PLAN and MEMORY modes, press the UP/DOWN buttons. 3.2.
Symbol 10 Button Press Main functions UP Long Enable gas switching in NITROX mode DOWN Short Toggle between alternative displays Change submode Decrease values DOWN Long Enter Setting mode Toggle between ceiling and remaining air time display
4. GETTING STARTED WITH YOUR SUUNTO COBRA2 To get the most out of your Suunto Cobra2, take some time to personalize it and really make it YOUR computer. Set the correct time and date, as well as the alarms and tones, unit and backlight settings, then calibrate and test the compass function. Suunto Cobra2 is a very user-friendly dive computer, and you will quickly become familiar with its functions.
ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 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. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 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).
AC APPEARS IN THE TOP RIGHT CORNER OF THE DISPLAY, WHEN THE DIVE COMPUTER IS IN CONTACT WITH WATER. THIS ALSO ACTIVATES THE DIVE MODE. 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.
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. TO LOCK A BEARING, PRESS SELECT. The Suunto Cobra2 also provides help for navigating square and triangular patterns, as well as navigating a return heading.
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. Strong electromagnetic fields, such as powerlines, stereo speakers, and magnets can affect the compass calibration.
5. BEFORE DIVING 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.
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.
Alarm type Alarm reason Current time is shown Continuous beep series for 24 seconds or until any button is pressed. Current time blinks for one minute Preset alarm time is reached. Table 5.3. Oxygen alarms in NITROX mode Alarm type Alarm reason 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%.
5.7.1. Connecting Suunto Cobra2 to a regulator When purchasing the Suunto Cobra2, we strongly recommend that you have your Suunto representative attach it to the first stage of your regulator. However, if you decide to attach it yourself, follow the steps outlined below: 1. Remove the high pressure (HP) port plug on the first stage of your regulator using an appropriate tool. 2. Thread the high pressure hose of the Suunto Cobra2 into the HP port of your regulator with your fingers.
ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. NOTE With a range of 1 - 999 minutes, the alarm can be set to your planned 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. In addition, the oxygen partial pressure limit must be set.
5.8.5. Setting the sample rate The sample rate controls how often the depth, time, tank pressure, and water temperature is stored in the memory. You can set the dive profile sample rate to 1, 10, 20, 30, or 60 seconds. The factory default setting is 20 seconds. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 5.8.6. Setting the Safety Stops/Deep Stops The Deep Stop setting allows you to choose between traditional Safety Stops or Deep Stops.
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.
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. The dive computer will adjust its mathematical model according to the entered altitude setting, giving shorter no-decompression times at higher altitudes (see Table 9.
Table 5.5. Personal Adjustment settings Personal Condition adjustment value Desired tables P0 Ideal conditions Default P1 Some risk factors or conditions exist Progressively more conservative P2 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.
5.10.2. Mandatory Safety Stops When the ascent rate exceeds 10 m/33 ft per minute continuously for more than 5 seconds, the microbubble build-up is predicted to be more than is allowed for in the decompression model. 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.
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. Diving in AIR mode (DIVEair) In this section, we look at how to make the most of the dive computer when diving with standard air. To activate DIVEair mode, please see Section 5.9.1. Accessing DIVE mode.
UP BUTTON TOGGLES BETWEEN DIVE TIME AND WATER TEMPERATURE. 6.1.2. Bookmark It is possible to record bookmarks in the profile memory during a dive. These bookmarks are displayed when scrolling the profile memory on the display. 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).
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. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. Three double beeps are also heard when the cylinder pressure goes down to the userselected alarm pressure and when the remaining air time reaches zero. 6.1.4. Ascent rate indicator The ascent rate is show graphically along the right hand side.
• • 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 WARNING 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.
UPWARD POINTING ARROW, BLINKING ASC 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. Below is an example of a decompression dive above the floor. UPWARD POINTING ARROW HAS DISAPPEARED AND ASC TIME LABEL HAS STOPPED BLINKING, MEANING YOU ARE IN THE DECOMPRESSION RANGE.
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.
DOWN BUTTON TOGGLES BETWEEN O2, MAXIMUM DEPTH TANK PRESSURE AND CURRENT TIME. UP BUTTON TOGGLES BETWEEN PO2, OLF, DIVE TIME AND WATER TEMPERATURE. 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.
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. BY PRESSING THE SELECT BUTTON DURING A DIVE, A BOOKMARK IS WRITTEN IN THE PROFILE MEMORY, THE DIVE TIMER IS RESET, AND THE PREVIOUSLY-TIMED INTERVAL IS DISPLAYED BELOW.
7. AFTER DIVING Once back at the surface, Suunto Cobra2 continues to provide post-dive safety information and alarms. Calculations to enable repetitive dive planning also help to maximize diver safety. Table 7.1. Alarms Symbol on display Indication Diver Attention Symbol - Extend Surface Interval Violated Decompression Ceiling Do Not Fly Symbol 7.1. Surface interval An ascent to any depth shallower than 1.
7.4. Flying after diving The no-fly time is shown in the center window next to the airplane image. Flying or traveling to a higher altitude should be avoided at any time when the computer is counting down the no-fly time. The no-fly time is always at least 12 hours, or equivalent to the so-called desaturation time (if longer than 12 hours). For desaturation times lower than 70 minutes, no no-fly time is given. In the Permanent Error mode and GAUGE mode the no-fly time is 48 hours.
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 “–”.
PRESS UP OR DOWN BUTTONS TO DESCEND OR ASCEND. The mode can also be used to add the desired surface intervals for dive simulations. Add the desired surface interval increments to the present surface interval by pressing the UP and DOWN buttons. ADD SURFACE TIME IN 15 MINUTES INCREMENTS. 7.6. MEMORY mode The memory options include a dive logbook (MEMlogbook) and dive history (MEMhistory). The dive time and date are registered in the Logbook memory.
• date of dive • type of dive (Air, Nitrox, Gauge) • dive start time • dive number • oxygen percentage for Mix1 • total dive time Page II • maximum depth • surface time before previous dive • warnings • consumed tank pressure Page III • depth/time profile of the dive • real-time water temperature • tank pressure The memory will retain approximately the last 42 hours of dive time. After that, when new dives are added, the oldest dives are deleted.
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.
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. 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.
CAUTION • • • 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.
3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 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.
9. TECHNICAL DATA 9.1. Technical specifications Dimensions and weight: • Diameter: width 73 mm/2.85 in, length 165 mm/6.50 in • Thickness: 35 mm/1.40 in • Weight: 210 g/7.
• Life expectancy at 20°C/68°F: • 0 dives/y - 3 years • 100 dives/year – 2 years • 300 dives/year – 1.5 years The following conditions have an effect on the expected battery lifetime: • The length of the dives • The conditions in which the unit is operated and stored (e.g. temperature/cold conditions). Below 10°C/50°F the expected battery lifetime is about 50-75% of that at 20°C/68°F • The use of the backlight and audible alarms • The use of the compass • The quality of the battery.
Diver Attention Symbol – Advice to Extend Surface Interval Some patterns of diving cumulatively add a higher risk of DCI; for example, dives with short surface intervals, repetitive dives deeper than earlier ones, multiple ascents, and substantial multiday diving. 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. 9.2.2.
No-decompression time limits (mins) for various depths (ft) for the first dive of a series Depth (ft) 120 130 140 150 Personal Mode / Altitude Mode P0/A0 P0/A1 P0/A2 P1/A0 P1/A1 P1/A2 P2/A0 P2/A1 10 9 7 6 9 7 6 5 8 6 5 4 9 7 6 5 8 6 5 4 6 5 4 4 8 6 5 4 6 5 4 4 P2/A2 5 4 4 3 9.2.3. Altitude diving The atmospheric pressure is lower at high altitudes than at sea level.
10. INTELLECTUAL PROPERTY 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.
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 typeexamined this type of personal protective equipment.
12. WARRANTY NOTE Warranty arrangements vary from country to country. The dive computer packaging contains information regarding the warranty benefits and requirements applicable to your purchase.
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.
GLOSSARY Air time The amount of dive time remaining, based on a calculation of cylinder pressure and ambient pressure and present air consumption. Altitude dive A dive made at an elevation greater than 300 m/1000 ft above sea level. Ascent rate The speed at which the diver ascends toward the surface. ASC RATE Abbreviation for ascent rate. Ascent time The minimum amount of time needed to reach the surface on a decompression stop dive. ASC TIME Abbreviation for ascent time.
Multi level dive A single or repetitive dive that includes time spent at various depths and whose no decompression limits are therefore not determined solely by the maximum depth attained. Nitrox In sports diving, refers to any mix with a higher fraction of oxygen than standard air. NOAA United States National Oceanic and Atmospheric Administration.
TWO YEAR WARRANTY This product is warranted to be free of defects in material and/or workmanship to the original owner for the above noted period (does not include battery life). Keep a copy of the original purchase receipt and make sure to get this warranty card stamped at the place of purchase. The warranty originates from the date of purchase. All warranties are limited and are subject to the restrictions given in the instruction manual.
