SUUNTO Cobra2 User Manual

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 ... ... ... . .. . .. . ... ... ... . .. . ... .. 11

4.1. TIME mode settings .. ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... . 11

4.1.1. Setting the alarm .. ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... .. 11

4.1.2. Setting the time . ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... . 11

4.1.3. Setting the date ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... .. 11

4.1.4. Setting the units .. ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... 12

4.1.5. Setting the backlight ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . 12

4.1.6. Setting the tones ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... . 12

4.2. AC water contacts .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . .. 12

4.3. Learning how to use your compass ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . . 13

4.3.1. Compass display .. ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . .. 13

4.3.2. Locking a bearing ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . 14

4.3.3. Compass settings .. . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . 14

5. BEFORE DIVING ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . . 16

5.1. The Suunto RGBM/Deep Stop Algorithm ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... . 16

5.2. Emergency ascents . . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . . 16

5.3. Dive computer limitations .. ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... .. 16

5.4. Nitrox .. ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... .. 17

5.5. Audible and visual alarms . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... .. 17

5.6. Error conditions ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... .. 18

5.7. Air integration . ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . .. 18

5.7.1. Connecting Suunto Cobra2 to a regulator . ... ... . .. . ... ... ... ... . .. . ... ... ... 19

5.8. DIVE mode settings ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... 19

5.8.1. Setting the depth alarm . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... .. 19

5.8.2. Setting the dive-time alarm . . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . 19

5.8.3. Setting the nitrox values . ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . 20

5.8.4. Setting the personal/altitude adjustments .... . .. . ... ... ... . .. . .. . ... ... ... . .. . 20

5.8.5. Setting the sample rate ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . 21

5.8.6. Setting the Safety Stops/Deep Stops . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... 21

5.8.7. Setting the RGBM values ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . 21

5.9. Activation and pre-checks ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... .. 21

5.9.1. Accessing DIVE mode . ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. 21

5.9.2. DIVE mode activation ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... . 22

5.9.3. Battery power indication . . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... 22

5.9.4. Diving at altitude ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... . 23

5.9.5. Personal adjustments . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . 23

5.10. Safety Stops ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... 24

5.10.1. Recommended Safety Stops . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... . 24

5.10.2. Mandatory Safety Stops ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... 25

5.11. Deep stops . ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... . 25

6. DIVING . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... 26

6.1. Diving in AIR mode (DIVEair) . ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... 26

6.1.1. Basic dive data .. . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . 26

6.1.2. Bookmark . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... .. 27

6.1.3. Tank pressure data ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... . 27

6.1.4. Ascent rate indicator . . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... .. 28

6.1.5. Safety Stops ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... 28

6.1.6. Decompression dives . . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... 28

6.2. Diving in NITROX mode (DIVEnitrox) . . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . 31

6.2.1. Before diving in NITROX mode . . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . . 31

6.2.2. Oxygen displays . ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... 31

6.2.3. Oxygen limit fraction (OLF) . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . . 32

6.2.4. Gas change and multiple breathing gas mixes . .. . ... ... ... ... . .. . ... ... ... .. 32

6.3. Diving in GAUGE mode (DIVEgauge) ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... . 32

7. AFTER DIVING . ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... .. 34

7.1. Surface interval . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... . 34

7.2. Dive numbering ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... .. 34

7.3. Repetitive dive planning . . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... 34

7.4. Flying after diving . . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . . 35

7.5. PLAN mode . . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . 35

7.5.1. Dive Planning mode (PLANnodec) ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . .. 35

7.5.2. Simulation Mode (PLANsimulator) .. ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . . 36

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. Water contacts and buttons ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . 40

8.2. Care of your dive computer . . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... .. 40

8.3. Maintenance . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... . 40

8.4. Water resistance inspection .. ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... .. 41

8.5. Battery replacement .. ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . . 41

8.5.1. Battery kit . . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... . 41

8.5.2. Required tools .. . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . . 41

8.5.3. Battery replacement procedure . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. 41

9. TECHNICAL DATA . ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . . 44

9.1. Technical specifications .. ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . 44

9.2. RGBM ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... .. 45

9.2.1. Suunto RGBM adaptive decompression . .. . ... ... ... ... . .. . ... ... ... ... . .. . .. 45

9.2.2. No-decompression limits .. . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . .. 46

9.2.3. Altitude diving . ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... 47

9.3. Oxygen exposure ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . . 47

10. INTELLECTUAL PROPERTY .... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... . 48

10.1. Copyright .. ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... .. 48

10.2. Trademark . . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . 48

10.3. Patent notice . . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... . 48

11. DISCLAIMERS . . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... .. 49

11.1. User’s responsibility .. ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. 49

11.2. CE ... . .. . ... ... ... ... . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . . 49

11.3. Limits of liability and ISO 9001 compliance . ... ... ... . .. . ... ... ... ... . .. . ... ... ... 49

11.4. After sales service . . .. . ... ... ... . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . . 49

12. WARRANTY . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . . 50

13. DISPOSAL OF THE DEVICE ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . .. 51

GLOSSARY . .. . .. . ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . ... ... ... ... . .. . 52

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.

With integrated digital compass, air integration, and gas switching, Suunto Cobra2 simplifies your diving experience because all the information you need relating to depth, time, tank pressure, decompression status, and direction is available on one easy-to-read screen.

To get the most out of your Suunto Cobra2, please read this instruction manual carefully and make sure you understand the use, displays, and limitations of the instrument before using it. To make life easier, we've included a glossary of dive-specific terminology at the back of the manual.

2. WARNINGS, CAUTIONS, AND NOTES

Throughout this manual, important safety icons are displayed. Three classifications are used to separate these icons by their order of importance:

WARNING

is used in connection with a procedure or situation that could result in serious injury or death

CAUTION

NOTE

Before you go on to read the manual itself, it is extremely important that you read the following warnings. These warnings are intended to maximize your safety while using Suunto Cobra2 and must not be ignored.

WARNING

is used in connection with a procedure or situation that could result in damage to the device

is used to emphasize important information

READ THIS MANUAL! Carefully read this manual in its entirety, paying close attention to all the warnings listed below, including Section 5. BEFORE DIVING. Make sure that you fully understand the use, displays and limitations of the dive computer, because any confusion resulting from neglecting to follow this user's manual or from improper use of this device could cause you to commit errors that may lead to serious injury or death.

NOT FOR PROFESSIONAL USE! Suunto dive computers are intended for recreational use only. The demands of commercial or professional diving may expose the diver to depths and conditions that tend to increase the risk of decompression illness (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 EQUIPMENT SHOULD USE A DIVE COMPUTER! No dive computer can replace the need for proper dive training. Insufficient or improper training may cause you to commit errors that may lead to serious injury or death.

THERE IS ALWAYS A RISK OF DECOMPRESSION ILLNESS (DCI) FOR ANY DIVE PROFILE, EVEN IF YOU FOLLOW THE DIVE PLAN PRESCRIBED BY DIVE TABLES OR A DIVE COMPUTER. NO PROCEDURE, DIVE COMPUTER, ORDIVE TABLECAN PREVENT THE POSSIBILITY OF DCI OR OXYGEN TOXICITY! An individual’s physiological make-up can vary from day to day. The dive computer cannot account for these variations. You are strongly advised to remain well within the exposure limits provided by the instrument to minimize the risk of DCI. As an added precaution, you should consult a physician regarding your fitness before diving.

WARNING

SUUNTO STRONGLY RECOMMENDS THAT SPORT DIVERS LIMIT THEIR MAXIMUM DEPTH TO 40 M/130 FT OR TO THE DEPTH CALCULATED BY THE COMPUTER BASED ON THE SELECTED O2% AND A MAXIMUM PO2OF 1.4 BAR!

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.

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 FLYINGANY 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 Diver’s 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.

WARNING

THE DIVE COMPUTER WILL NOT ACCEPT FRACTIONAL PERCENTAGEVALUES OF OXYGENCONCENTRATION. 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 PO2setting to affect oxygen exposure.

WARNING

SELECT THE CORRECTALTITUDE 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.

WARNING

NOTE

SELECT THE CORRECT PERSONAL ADJUSTMENT SETTING! Whenever it is believed that factors that tend to increase the possibility of DCI exist, it is recommended that you use this option to make the calculations more conservative. Failure to select the correct Personal Adjustment setting will result in erroneous dive and planning data.

This device contains a Lithium cell battery. To reduce the risk of fire or burns, do not disassemble, crush, puncture, short external contacts, or dispose of in fire or water. Replace only with manufacturer-specified batteries. Recycle or dispose of used batteries properly.

It is not possible to change between AIR, NITROX and GAUGE modes before the instrument has counted down the no-fly time. There is one exception to this: You can change from AIR to NITROX mode even during the no-fly time. When planning both air and nitrox dives during the same dive series, you should set the instrument in NITROX mode and modify the gas mix accordingly. In GAUGE mode, the no-fly time is always 48 hours.

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. Button symbols and functions

The table below explains the main functions of the dive computer's buttons. The buttons and their use will be explained in more detail in the relevant sections of the manual.

Table 3.1. Button symbols and functions

Main functionsPressButtonSymbol

ShortMODE

Switch between main modes Switch from submode to main mode Activate backlight in DIVE mode

Activate backlight in other modesLongMODE

ShortSELECT

ShortUP

Select a submode Select and accept settings

Activate compass in TIME and DIVE modesLongSELECT

Toggle between alternative displays Change submode Increase values

Main functionsPressButtonSymbol

Enable gas switching in NITROX modeLongUP

ShortDOWN

LongDOWN

Toggle between alternative displays Change submode Decrease values

Enter Setting mode Toggle between ceiling and remaining air time display

4. GETTING STARTED WITH YOUR SUUNTO COBRA2

USE UP AND DOWN BUTTONS

TO TOGGLE BETWEEN ALARM, TIME,

DATE, UNITS, BACKLIGHT

AND TONES.

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

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. Make absolutely sure that you know your computer and have it set up as you want it 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.

NOTE

Now that you know how to toggle between the shortcuts, you can start to set them. The following figure shows how to enter the TIME SETTINGS menu.

4.1.1. Setting the alarm

The dive computer has a daily alarm function. When the daily alarm activates, the screen blinks and the alarm sounds for 24 seconds. Press any button to stop the alarm.

The display is illuminated by holding down the MODE button for more than 2 seconds.

4.1.2. Setting the time

In the TIME SETTING mode, you are able to set the hour, minute, and second, as well as choose between 12 and 24 hour display.

4.1.3. Setting the date

Use the DATE SETTING mode to set the year, month, and day. The day of the week is automatically calculated in accordance with the date.

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

4.1.4. Setting the units

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

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). When the backlight is turned off, it does not illuminate when an alarm sounds.

4.1.6. Setting the tones

The TONE SETTING mode allows you to activate or deactivate the tones.

NOTE

When the tones are off, there are no alarms.

4.2. AC water contacts

The water and data transfer contact is located on the rear of the case. When submerged, the water contact poles are connected by the conductivity of the water and the “AC” symbol appears on the display. The AC text is shown until the water contact deactivates.

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

IF ACCESSED FROM TIME MODE, TIME AND BEARING ARE DISPLAYED AT THE BOTTOM OF THE SCREEN.

IF ACCESSED FROM DIVE MODE,

CURRENT DEPTH AND TIME OR

MAXIMUM DEPTH, AS WELL AS BEARING

OR DIVE TIME OR TEMPERATURE ARE

DISPLAYED.

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.

NOTE

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 the correct bearing. As long as the device is held at an angle of +/- 5oto 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

TO LOCK A BEARING,

PRESS SELECT.

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

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

ExplanationSymbol

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

HOLD THE DEVICE LEVEL AND SLOWLY ROTATE 360°.

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. It is therefore advisable to calibrate the compass if your Suunto Cobra2 has been exposed to these fields.

NOTE

When traveling overseas, it is recommended that you recalibrate the compass at the new location before using it.

NOTE

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.

5. BEFORE DIVING

YOU ARE ADVISED TO MAKE A

DEEPSTOP AT 18 M. THE SECOND

INDICATOR SHOWS THAT YOU HAVE 110 SECONDS LEFT OF YOUR DEEPSTOP.

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

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

Suunto’s 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.

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.

In order to optimize the response to different increased risk situations, an additional category of stop, referred to as a Mandatory Safety Stop, has been introduced. The combination of stop types depends on the user settings and the specific dive situation.

To get the most from the RGBM safety benefits, refer to Section 9.2. RGBM.

5.2. Emergency ascents

In the unlikely event that the dive computer malfunctions during a dive, follow the emergency procedures provided by your certified dive training agency or, alternatively, follow these steps:

Assess the situation calmly and then move promptly to less than 18 m/60 ft.

1. At 18 m/60 ft, slow down your ascent rate to 10 m/33 ft per minute and move to a

2. depth between 3 and 6 m/10 and 20 ft. Stay there for as long as your air supply will safely allow. After reaching the surface,

3. do not dive for at least 24 hours.

5.3. Dive computer limitations

While the dive computer's calculations are based on current decompression research and technology, it is important to realize that the computer cannot monitor the actual physiological functions of an individual diver. All decompression schedules currently known to the authors, including the U.S. Navy Tables, are based on theoretical mathematical models, which are intended to serve as a guide to reduce the probability of decompression illness.

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. In order to manage this risk, the dive computer tracks the time and intensity of the oxygen exposure and provides the diver with information to adjust the dive plan in order to maintain oxygen exposure within reasonably safe limits.

In addition to the physiological effects of enriched air on the body, there are operational considerations to be addressed when handling altered breathing mixes. Elevated concentrations of oxygen present a fire or explosion hazard. Consult the manufacturer of your equipment to check its compatibility with nitrox.

5.5. Audible and visual alarms

The dive computer features audible and visual alarms that advise when important limits are approached or that prompt you to acknowledge preset alarms. The table below describes the different alarms and their meanings.

Table 5.1. Audible and visual alarm types

Alarm reasonAlarm type

Dive computer is activated.Short single beep

Dive computer automatically returns to the TIME mode.

Three beeps with a three second interval

Three beeps with a three second interval and activated backlight

Continuous beeps and activated backlight

Cylinder pressure reaches 50 bar/725 psi. The cylinder pressure display will start to blink.

Cylinder pressure reaches the selected alarm pressure.

Calculated remaining air time reaches zero.

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 reasonAlarm type

Continuous beep series for 24 seconds Maximum depth blinks as long as the current depth value

exceeds the preset value.

Continuous beep series for 24 seconds or until any button is pressed.

Dive time blinks for one minute.

Preset maximum depth is reached.

Preset dive time is reached.

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

Continuous beeps for 3 minutes and activated backlight

Set oxygen partial pressure limit is exceeded. The alternative display is replaced with a current blinking PO value. You should immediately ascend above the PO depth limit.

OLF value reaches 80%. The OLF value will start to blink.

OLF value reaches 100%. The OLF value will blink.

Alarm reasonAlarm type

Preset alarm time is reached.

Alarm reasonAlarm type

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 ISREACHED, 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.

5.7.1. Connecting Suunto Cobra2 to a regulator

USE UP AND DOWN BUTTONS

TOGGLE BETWEEN DIVE SETTINGS

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

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:

Remove the high pressure (HP) port plug on the first stage of your regulator using an

1. appropriate tool. Thread the high pressure hose of the Suunto Cobra2 into the HP port of your regulator

2. 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. Check for leaks

3. by submerging the regulator first stage in water. If leaks are detected, check the condition of the O-ring and sealing surfaces.

5.8. DIVE mode settings

Suunto Cobra2 has several user-definable functions, as well as depth and time-related alarms that you can set according to your personal preferences. The DIVE mode settings are dependent on the dive sub-mode chosen (AIR, NITROX, GAUGE), so that, for example, nitrox settings are only available in the DIVENitrox sub-mode.

The following figure shows how to enter the DIVE mode settings menu.

NOTE

The settings cannot be activated until 5 minutes has elapsed after the dive.

5.8.1. Setting the depth alarm

You can set a depth alarm in the dive computer.

The depth alarm is factory-set to 30 m/131 ft, but you can adjust it according to your personal preference, or switch it off altogether. The depth range can be set from 3m to 100 m/9 ft to 328 ft.

5.8.2. Setting the dive-time alarm

The Suunto Cobra2 has a dive-time alarm setting which, when activated, can be used for several purposes to add to your diving safety.

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

NOTE

ADJUST WITH

UP AND DOWN BUTTONS. ACCEPT WITH

SELECT BUTTON.

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

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. When in the Nitrox setting mode, the equivalent allowed maximum depth, based on the chosen setting, will also be displayed. Settings for an additional mix (MIX2) are made similarly, but with the additional selection of “ON” or “OFF”.

In order to minimize the risk of error during a dive, it is highly recommended that the mixes are set in the proper order. This means that as the mix number rises, so does oxygen content, and this is the order they are usually used during the dive. Before a dive, only set to “ON” the mixes you actually have available and remember to check the set values to make sure they are correct.

The default oxygen percentage (O2%) setting is 21% (air) and oxygen partial pressure (PO2) setting 1.4 bar. After entering values for MIX1, you can enable/disable and set an additional gas mix - MIX2.

NOTE

If the oxygen content of a mix is set to 22% or above, the setting will remain stored until changed; it does not automatically revert back to 21%.

5.8.4. Setting the personal/altitude adjustments

The current Altitude and Personal Adjustment settings are displayed in the startup screen when entering the DIVE mode. If the mode does not match the altitude or personal conditions (see Section 5.9.4. Diving at altitude and Section 5.9.5. Personal adjustments), it is imperative that you enter the correct selection before diving. Use Altitude Adjustment to select the correct altitude and use Personal Adjustment to add an extra level of conservatism.

5.8.5. Setting the sample rate

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

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.

5.8.6. Setting the Safety Stops/Deep Stops

The Deep Stop setting allows you to choose between traditional Safety Stops or Deep Stops. If Deep Stops are set to OFF, only the traditional Safety Stop calculation is used. If set to ON, iterative Deep Stops will be prompted aswell. The length of the individual Deep Stops can be set to 1 or 2 minutes.

5.8.7. Setting the RGBM values

For certain divers and diving conditions, it may be desirable to set the attenuated RGBM mode. The selection is displayed during the DIVE mode startup. The options are full RGBM effects (100%), and attenuated RGBM (50%).

5.9. Activation and pre-checks

This section describes how to activate the DIVE mode and explains the pre-checks that it is highly recommended you perform before you get into the water.

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. The OFF mode disables the DIVE mode, and allows the TIME mode to be used underwater. The chosen dive mode is displayed when the DIVE mode is accessed, and you can toggle between the submodes by pressing the UP/DOWN buttons.

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. After this, the selected altitude and personal settings are displayed, as well as the RGBM and Deep Stop status. A few seconds later the battery power indicator is shown.

At this time, perform your pre-checks, making sure that:

the instrument operates in the correct mode and provides a complete display

• (AIR/NITROX/GAUGE mode) the battery level is ok

• the altitude, personal adjustment, Safety/Deep stops, and RGBM settings are correct

• the instrument displays correct units of measurement (Metric/Imperial)

• the instrument displays the correct temperature and depth (0.0 m/0 ft)

• the alarm beeps

•

And, if set to NITROX mode, make sure that:

the correct number of mixes is set and that the oxygen percentages are adjusted

• according to the measured nitrox blends in your cylinders the oxygen partial pressure limits are set correctly

•

For more information on the NITROX mode, refer to Section 6.2. Diving in NITROX mode (DIVEnitrox).

The dive computer is now ready for diving.

5.9.3. Battery power indication

Temperature or internal oxidation of the battery affect the battery voltage. If the instrument is stored for a long period, or used in cold temperatures, the low battery warning may be displayed even though the battery has enough capacity. In these cases, re-enter DIVE mode to receive the battery power indication.

After the battery check, the Low Battery Warning is indicated by the battery symbol.

If the battery symbol is displayed in the Surface mode, or if the display is faded or weak, the battery may be too low to operate the dive computer, and battery replacement is recommended.

NOTE

For safety reasons, the backlight cannot be activated when the low battery warning is indicated by the battery symbol.

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 9.1, No-decompression

time limits for various depths (m) and Table 9.2, No-decompression time limits for various depths (ft) in Section 9.2. RGBM).

Table 5.4. Altitude Adjustment settings

Altitude rangeAlt. adjustment value

0 - 300 m / 0 - 1000 ftA0

300 - 1500 m / 1000 - 5000 ftA1

1500 - 3000 m / 5000 - 10 000 ftA2

NOTE

WARNING

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, No-

decompression time limits for various depths (m) and Table 9.2, No-decompression time limits for various depths (ft) ).

Section 5.8.4. Setting the personal/altitude adjustments describes how the Altitude value is set.

Traveling to a higher elevation can temporarily cause a change in the equilibrium of dissolved nitrogen in the body. It is recommended that you acclimatize to the new altitude by waiting at least three hours before diving.

Table 5.5. Personal Adjustment settings

WHEN STOP IS DISPLAYED,

MAKE A RECOMMENDED SAFETY

STOP FOR 3 MINUTES.

Personal

Desired tablesCondition adjustment value

DefaultIdeal conditionsP0

Progressively more conservativeSome risk factors or conditions existP1

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

EffectDesired TablesRGBM setting

100%

Standard Suunto RGBM model

Full RGBM effects

(Default)

Smaller RGBM effects, higher risk!Attenuated RGBM model50%

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.

NOTE

The Recommended Safety Stop, as the name implies, is recommended. If it is ignored, there is no penalty applied to the following surface intervals and dives.

5.10.2. Mandatory Safety Stops

WHEN CEILING AND STOP ARE

DISPLAYED, MAKE A ONE MINUTE

MANDATORY SAFETY STOP IN THE

DEPTH ZONE BETWEEN 6 M AND 3 M.

WHEN CEILING AND STOP ARE DISPLAYED, IMMEDIATELY (WITHIN 3 MINUTES) DESCEND

TO OR BELOW CEILING.

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.

The STOP sign appears in the display and when you reach the depth zone between 6 m and 3 m/20 ft and 10 ft, the CEILING label, ceiling depth, and the calculated Safety Stop time also appear in the display. You should wait until the Mandatory Safety Stop warning disappears. The total length of the Mandatory Safety Stop time depends on the seriousness of the ascent rate violation.

You must not ascend shallower than 3 m/10 ft with the Mandatory Safety Stop warning on. If you ascend above the Mandatory Safety Stop ceiling, a downward pointing arrow will appear and a continuous beeping starts. You should immediately descend to, or below, the Mandatory Safety Stop ceiling depth. If you correct this situation at any time during the dive, there are no effects on the decompression calculations for future dives.

If you continue to violate the Mandatory Safety Stop, the tissue calculation model is affected and the dive computer shortens the available no-decompression time for your next dive. In this situation, it is recommended that you prolong your surface interval time before your next dive.

5.11. Deep stops

Deep Stops are safety stops that occur deeper than traditional stops, with the purpose of minimizing microbubble formation and excitation.

The Suunto RGBM model calculates deep stops iteratively, placing the first stop about halfway between the maximum depth and the ceiling depth. After the first Deep Stop is completed, another Deep Stop will be prompted halfway to the ceiling, and so on until the ceiling depth is reached.

The Deep Stop length can be set to 1 or 2 minutes.

NOTE

With Deep Stops on, the Recommended Safety Stops will still be activated at the end of the dive.

6. DIVING

DIVE HAS JUST BEGUN AND

AVAILABLE NO-DECOMPRESSION

TIME IS OVER 99 MINUTES SO NO

VALUE IS DISPLAYED.

DIVE DISPLAY - PRESENT DEPTH IS 15 M, NO-DECOMPRESSION STOP TIME LIMIT IS 38 MIN. ELAPSED DIVE TIME IS 13 MIN. 99 MINUTES OF REMAINING AIR TIME AND 202 BAR TANK PRESSURE.

DOWN BUTTON TOGGLES BETWEEN MAXIMUM DEPTH AND CURRENT TIME.

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.

NOTE

The dive computer will remain in the Surface mode at depths less than 1.2 m/4 ft. At depths greater than 1.2 m/4 ft the instrument will go into the DIVE mode automatically. However, it is recommended that you activate the DIVE Mode manually in order to perform the necessary dive pre-checks.

6.1.1. Basic dive data

During a No-decompression dive, the following information is displayed:

your present depth in meters/feet

• the available no-decompression time in minutes as NO DEC TIME

• the ascent rate presented as a bar graph on the right side

• the Diver Attention Symbol if surface interval should be prolonged (see Table 7.1,

• Alarms)

Alternative displays, by pressing the UP/DOWN buttons, show:

the elapsed dive time in minutes, shown as DIVE TIME

• the water temperature in °C/°F

• the maximum depth during this dive in meters/feet, indicated as MAX

• the current time, shown as TIME

•

UP BUTTON TOGGLES BETWEEN DIVE TIME AND WATER TEMPERATURE.

6.1.2. Bookmark

A BOOKMARK IS PLACED IN THE PROFILE MEMORY DURING A DIVE BY PRESSING

THE SELECT BUTTON.

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). To make a bookmark in the profile memory during a dive, press the SELECT button. A brief confirmation will be given.

6.1.3. Tank pressure data

The pressure of your scuba cylinder in bars (or psi) is shown digitally in the lower left corner of the alternative display. Whenever you start a dive, the remaining air time calculation begins. After 30 - 60 seconds (sometimes more, depending on your air consumption), the first estimation of remaining air time will be shown in the left center window of the display. The calculation is always based on the actual pressure drop in your cylinder and will automatically adapt to your cylinder size and current air consumption.

The change in your air consumption will be based on constant one second interval pressure measurements over 30 - 60 second periods. An increase in air consumption will influence the remaining air time rapidly, while a drop in air consumption will increase the air time slowly. In this way, an over optimistic air time estimation, caused by a temporary drop in air consumption, is avoided.

The remaining air time calculation includes a 35 bar/500 psi safety reserve. This means that when the instrument shows the air time to be zero, there is still about 35 bar/500 psi of pressure left in your cylinder, depending on your air consumption rate. With a high consumption rate, the limit will be closer to 50 bar/725 psi and with a low rate closer to 35 bar/500 psi.

NOTE

Filling your BC affects the air time calculation due to the temporary increase in air consumption.

NOTE

A change of temperature will affect the cylinder pressure and consequently the air time calculation.

Low Air Pressure Warnings

ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON.

NORMAL

ASCENT

RATE.

ACTIVATED BACKLIGHT,

ALARM AND A BLINKING ASCENT RATE BAR GRAPH INDICATE YOU ARE ASCENDING FASTER THAN 10 M/MIN. YOU ARE ADVISED TO MAKE A MANDATORY SAFETY STOP WHEN YOU REACH A

DEPTH OF 6 M.

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 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. When the maximum allowed ascent rate is exceeded, the lower segments start to blink with the top segment staying solid, indicating that the maximum ascent rate has been exceeded continuously or that the current ascent rate is significantly above the allowed rate.

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). 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

•

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

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

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.

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

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.

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.

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

UPWARD POINTING ARROW HAS DISAPPEARED AND ASC TIME LABEL HAS STOPPED BLINKING, MEANING YOU ARE IN

THE DECOMPRESSION RANGE.

TWO ARROWS POINT AT EACH OTHER

“HOUR GLASS”. YOU ARE IN THE OPTIMUM CEILING

ZONE AT 3 M. AND YOUR MINIMUM ASCENT TIME IS

15 MINUTES.

DECOMPRESSION DIVE, ABOVE CEILING.

NOTE DOWNWARD POINTING ARROW, ER WARNING

AND ALARM. YOU SHOULD IMMEDIATLY (WITHIN

3 MINUTES) DES C END TO OR BELOW CEILING.

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 DIVE MODE ACTIVATION. MAXIMUM OPERATIONAL DEPTH BASED ON SET O2% (21%) AND PO2 (1.4 BAR) IS 56.7 M.

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 PO2setting to affect oxygen exposure according to the entered O2% and PO2values. 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 PO2values 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 PO2values.

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 PO

• the current oxygen toxicity exposure, labeled OLF

• maximum depth

• current time

• water temperature

• dive time

• tank pressure

•

UP BUTTON

TOGGLES BETWEEN PO2, OLF, DIVE TIME AND WATER TEMPERATURE.

DOWN BUTTON

TOGGLES BETWEEN O2, MAXIMUM DEPTH TANK PRESSURE AND CURRENT

TIME.

6.2.3. Oxygen limit fraction (OLF)

CHANGING GAS MIX. SCROLL

THROUGH ENABLED MIXES BY PRESSING THE UP OR DOWN BUTTONS. SELECT NEW MIX BY

PRESSING THE SELECT BUTTON.

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:

NOTE

Mix number, O2%, and PO2for the mixes are shown when scrolling. If the set PO2limit is exceeded , it will be shown with the PO2value blinking. The dive computer does not allow you to change to a gas

NOTE

whose set PO2is 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 PO2level you have set for the next mix allows a gas change. The prompt is an audible 3 beeps and the current O2mix 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.

In the GAUGE mode, the total dive time is always displayed in minutes in the lower right

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.

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.

NOTE

The GAUGE mode does not provide decompression information.

There is no ascent rate monitoring in the GAUGE mode.

If you dive with the GAUGE mode, it is not possible to change between the modes before the no fly time has counted down.

7. AFTER DIVING

IT IS 15 MINUTES SINCE YOU SURFACED

FROM A 6-MINUTE DIVE. THE PRESENT DEPTH IS

0.0 M. THE AIRPLANE SYMBOL AND NO-FLY VALUE INDICATE THAT YOU SHOULD NOT FLY FOR 20

HOURS.

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

IndicationSymbol on display

Diver Attention Symbol - Extend Surface Interval

Violated Decompression Ceiling

Do Not Fly Symbol

7.1. Surface interval

An ascent to any depth shallower than 1.2 m/4 ft will cause the DIVING display to be replaced by the SURFACE display:

Or, in the alternative displays, the following information will be shown:

maximum depth of last dive in meters/feet

• dive time of last dive in minutes, shown as DIVE TIME

• the current time, shown as TIME

• the current temperature in °C/°F

•

If set to NITROX mode, the following information will also be shown:

the oxygen percentage labeled O2%

• the oxygen partial pressure labeled PO

• the current oxygen toxicity exposure labeled OLF

•

7.2. Dive numbering

Several repetitive dives are considered to belong to the same repetitive dive series when the dive computer has not counted the no-fly time to zero. Within each series, the dives are given individual numbers. The first dive of the series will be numbered as DIVE 1, the second as DIVE 2, the third as DIVE 3, etc.

If you start a new dive with less than 5 minutes of surface interval time, the dive computer interprets this as a continuation of the previous dive and the dives are considered to be the same. The diving display will return, the dive number will remain unchanged, and the dive time will begin where it left off. After 5 minutes on the surface, subsequent dives are, by definition, repetitive. The dive counter displayed in the Planning mode will increment to the next number if another dive is made.

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. The Dive Planning mode is explained in Section 7.5.1. Dive Planning mode (PLANnodec).

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. The Divers Alert Network (DAN) recommends the following on no-fly times:

A minimum surface interval of 12 hours would be required in order to be reasonably

• assured a diver will remain symptom free upon ascent to altitude in a commercial jetliner (altitude up to 2,400 m/8,000 ft) Divers who plan to make daily, multiple dives for several days, or make dives that

• require decompression stops, should take special precautions and wait for an extended interval beyond 12 hours before a flight. Further, the Undersea and Hyperbaric Medical Society (UHMS) suggests divers using standard air cylinders and exhibiting no symptoms of decompression illness wait 24 hours after their last dive to fly in an aircraft with cabin pressure up to 2,400 m/8,000 ft. The only two exceptions to this recommendation are:

If a diver has less than 2 hours total accumulated dive time in the last 48 hours, a

•

12 hour surface interval before flying is recommended 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. PLAN mode

The PLAN mode includes a dive planner (PLANnodec) and simulation mode (PLANsimulator).

7.5.1. Dive Planning mode (PLANnodec)

The Dive Planning mode displays no-decompression times for a new dive, taking into account the effects of previous dives.

When entering the PLANnodec mode, the display first briefly shows the remaining desaturation time before going into plan mode.

By pressing the UP/DOWN buttons, you can scroll the no-decompression limits in 3 m/10 ft increments ending at 45 m/150 ft. No-decompression limits longer than 99min are displayed as “—“.

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

• all dive history for the past four days

•

The no-decompression times given for different depths will therefore be shorter than before your first “fresh” dive.

You can exit the planning mode by pressing the MODE button.

NOTE

The Planning mode is disabled in GAUGE mode and in Error mode (see Section 5.6. Error conditions). The planning mode calculates nodecompression times for MIX1 only. If an additional mix is enabled in the NITROX mode, it does not affect the calculations in PLANNoDec mode.

Higher Altitude and conservative Personal Adjustment settings will shorten the nodecompression time limits. These limits at different Altitude and Personal Adjustment setting selections are explained in Section 5.9.4. Diving at altitude and in Section 5.9.5.

Personal adjustments

Dive numbering shown during dive planning

Dives belong to the same repetitive dive series if the instrument was still counting down the no-fly time at the beginning of the dive.

The surface interval must be at least 5 minutes for a dive to be considered a repetitive dive. Otherwise, it is considered a continuation of the same dive. The dive number will not change and the dive time will continue where it left off. (See also Section 7.2. Dive numbering ).

7.5.2. Simulation Mode (PLANsimulator)

The Simulation mode can be used to become familiar with the features and displays of the device before diving, to plan dives in advance, for demonstrational or educational purposes, or just for fun.

In the Simulation mode, time runs faster than real time, so after 15 seconds using a simulator, the dive time will be one minute.

Dive Simulator

The Dive Simulator is an excellent tool for familiarizing yourself with your dive computer and for planning your dives. The Dive Simulator allows you to "perform" dive profiles of your choice and to see what the display would look like during an actual dive - including basic dive information as well as audible and visual warnings.

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

ADD SURFACE TIME IN

15 MINUTES INCREMENTS.

THERE ARE THREE PAGES OF LOGBOOK DIVE INFORMATION. USE SELECT BUTTON TO SCROLL BETWEEN LOGBOOK PAGES I, II, AND III. THE DATA OF

THE MOST RECENT DIVE IS SHOWN FIRST.

the desired surface interval increments to the present surface interval by pressing the UP and DOWN buttons.

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. Always check before diving that the time and date are correctly set, especially after traveling between different time zones.

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 information will be shown on three pages:

Page I, main display

Maximum depth

•

date of dive

DIVE HISTORY DISPLAY.

TOTAL NUMBER OF DIVES, DIVE

HOURS AND MAXIMUM DEPTH.

• 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. The contents of the memory will remain when the battery is changed (providing that the battery has been replaced according to the instructions).

NOTE

Several repetitive dives are considered to belong to the same repetitive dive series if the no-fly time has not ended. See Section 7.2. Dive numbering for further information.

7.6.2. Dive history (MEMhistory)

The Dive History is a summary of all the dives recorded by the dive computer. The following information will be shown on the display:

The Dive History Memory can hold a maximum of 999 dives and 999 diving hours. When these maximum values are reached, the counters will start again from zero.

NOTE

The maximum depth can be reset to 0.0 m/0 ft using the PC-Interface unit and the downloadable Suunto Dive Manager software.

7.7. Suunto Dive Manager (SDM)

Suunto Dive Manager (SDM) is optional PC software that greatly enhances the functionality of your Suunto Cobra2. With the SDM software, you can download dive data from your dive computer to your 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.

You can always download the latest version of Suunto Dive Manager from www.suunto.com. Please check for updates regularly as new features are constantly being developed.

The following data is transferred to your PC:

depth profile of the dive

• dive time

• preceding surface interval time

• dive number

•

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 History’s 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. 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.

SuuntoSports.com 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 SuuntoSports.com

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 SuuntoSports.com 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.com’s 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.

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. 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.

•

CAUTION

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

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.

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.

CAUTION

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 (MIX1 21 % 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:

Unscrew the four screws at the back of the elastomer console and remove the back

cover of the console. Thoroughly rinse and dry the 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.

Open the securing ring of the battery compartment lid by pushing it down and rotating

3. 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.

4. Carefully remove the lid with the beeper attached to it. You can remove the lid by

5. 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.

6. Carefully remove the battery. Do not damage the electrical contacts or the sealing

7. surface. Check for any traces of flooding, particularly between the beeper and the lid, or for

8. 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

9. 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

10. cloth if necessary. Reinstall the battery retainer in its correct position.

11. Check that the new lubricated O-ring is in good condition. Put it in the right position

12. 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

13. 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

14. 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

15. into its locked position. The dive computer should now active its timekeeping mode and show time 18:00

16. [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.

17.

CAUTION

Check after the first dives for possible moisture under the transparent battery compartment lid, indicating a leak.

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/7.4 oz (without hose)

Depth gauge:

• Temperature compensated pressure sensor

• Salt water calibrated, in fresh water the readings are about 3% smaller (calibrated in

compliance with EN 13319)

• Maximum depth of operation: 100 m/328 ft (complying with EN 13319)

• Accuracy: ± 1% of full scale or better from 0 to 80 m/262 ft at 20°C/68°F (complying

with EN 13319)

• Depth display range: 0 to 150 m/492 ft

• Resolution: 0.1 m from 0 to 100 m/1 ft from 0 to 328 ft

Temperature display:

• Resolution: 1°C/1°F

• Display range: -20 to +50°C/-9 to +122°F

• Accuracy: ± 2°C/± 3.6°F within 20 minutes of temperature change

Calendar clock:

• Accuracy: ± 25 s/month (at 20°C/68°F)

• 12/24 h display

Displays only in NITROX mode:

• Oxygen %: 21 - 99

• Oxygen partial pressure display: 0.2 - 3.0 bar, depending on the limit setting

• Oxygen Limit Fraction: 1 - 200% with 1% resolution

Logbook/dive profile memory:

• Recording interval: 20 seconds adjustable (1,10,20,30,60s).

• Memory capacity: approximately 42 hours of diving with 20 second recording interval

• Depth accuracy: 0.3 m/1 ft

Operating conditions:

• Normal altitude range: 0 to 3,000 m/10,000 ft above sea level

• Operating temperature: 0°C to 40°C/32°F to 104°F

• Storage temperature: -20°C to +50°C/ -4°F to +122°F

It is recommended that the instrument be stored in a dry place at room temperature.

NOTE

Tissue calculation model:

• Suunto Deep Stop RGBM algorithm (developed by Suunto and Bruce R. Wienke, BSc,

MSc, PhD)

• 9 tissue compartments

• Tissue compartment halftimes: 2.5, 5, 10, 20, 40, 80, 120, 240 and 480 minutes (on

gassing). The off gassing halftimes are slowed down

• Reduced gradient (variable) "M" values based on diving habit and dive violations. The

"M" values are tracked up to 100 hours after a dive

• The EAN and oxygen exposure calculations are based on recommendations by R.W.

Hamilton, PhD and currently accepted exposure time limit tables and principles

Battery:

• One 3 V lithium battery: CR 2450

• Battery storage time (shelf life): Up to three years

• Replacement: Every three years, or more often depending on dive activity

Do not leave the dive computer in direct sunlight!

• 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. (Some lithium batteries may exhaust unexpectedly, which

• cannot be tested in advance) The time the dive computer has been stored until it gets to the customer. (The battery

• is installed in the unit at the factory)

NOTE

9.2. RGBM

The Suunto Reduced Gradient Bubble Model (RGBM) is a modern algorithm for predicting both dissolved and free gas in the tissues and blood of divers. It was developed in cooperation between Suunto and Bruce R. Wienke BSc, MSc, PhD. It is based on both laboratory experiments and diving data, including data from DAN.

It is a significant advance on the classical Haldane models, which do not predict free gas (microbubbles). The advantage of Suunto RGBM is additional safety through its ability to adapt to a wide variety of situations. Suunto RGBM addresses 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

•

Low temperature or an internal oxidation of the battery may activate the battery warning even though the battery has enough capacity. In this case, the warning usually disappears when the DIVE mode is activated again.

9.2.1. Suunto RGBM adaptive decompression

The Suunto RGBM algorithm adapts its predictions of both the effects of microbubble build-up and adverse dive profiles in the current dive series. It also changes these calculations according to the personal adjustment you select.

The pattern and speed of decompression at the surface is adjusted according to microbubble influence.

On repetitive dives, adjustment may also be applied to the maximum allowable nitrogen overpressure in each theoretical tissue group.

Depending on the circumstances, Suunto RGBM will adapt the decompression obligations by doing any or all of the following:

Reducing No-decompression Stop dive times

• Adding Mandatory Safety Stops

• Increasing Decompression Stop times

• Advising an extended surface interval (Diver Attention symbol)

•

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 limits

The no-decompression limits displayed by the dive computer for the first dive to a single depth (see Table 9.1, No-decompression time limits for various depths (m) and Table 9.2, No-decompression time limits for various depths (ft) .), are slightly more conservative than those permitted by the U.S. Navy tables.

Table 9.1. No-decompression time limits for various depths (m)

9 12 15

18 21 24

27 30 33

36 39 42 45

No-decompression time limits (mins) for various depths (m) for the first

(m)

-124 72

52 37 29

23 18 13

11 9 7 6

163 89 57

39 29 24

18 14 11

9 7 6 5

130 67 43

30 23 19

15 12 9

8 6 5 5

Personal Mode / Altitude ModeDepth

163 89 57

39 29 24

18 14 11

9 7 6 5

dive of a series

130 67 43

30 23 19

15 12 9

8 6 5 5

96 54 35

5 20 16

12 9 8

6 5 4 4

130 67 43

30 23 19

15 12 9

8 6 5 5

96 54 35

25 20 16

12 9 8

6 5 4 4

P2/A2P2/A1P2/A0P1/A2P1/A1P1/A0P0/A2P0/A1P0/A0

75 45 29

21 15 12

9 7 6

5 4 4 3

Table 9.2. No-decompression time limits for various depths (ft)

30 40 50

60 70 80

90 100 110

No-decompression time limits (mins) for various depths (ft) for the first

(ft)

-120 69

50 36 28

22 17 13

160 86 56

38 29 23

18 14 11

127 65 41

29 22 19

15 11 9

Personal Mode / Altitude ModeDepth

160 86 56

38 29 23

18 14 11

dive of a series

127 65 41

29 22 19

15 11 9

92 52 34

25 20 15

11 9 7

127 65 41

29 22 19

15 11 9

92 52 34

25 20 15

11 9 7

P2/A2P2/A1P2/A0P1/A2P1/A1P1/A0P0/A2P0/A1P0/A0

73 43 28

20 15 11

9 7 6

No-decompression time limits (mins) for various depths (ft) for the first

(ft)

120 130 140 150

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:

•

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:

•

10 9 7 6

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 PO2is 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

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 PO2value blinks when it exceeds the preset limit in dive planning, the maximum depth according to the O2% and maximum PO2selected

9 7 6 5

Personal Mode / Altitude ModeDepth

8 6 5 4

dive of a series

9 7 6 5

8 6 5 4

P2/A2P2/A1P2/A0P1/A2P1/A1P1/A0P0/A2P0/A1P0/A0

6 5 4 4

8 6 5 4

6 5 4 4

5 4 4 3

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. 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.

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.

EN 250 Respiratory equipment - Open circuit self-contained compressed air diving apparatus – Requirements, testing, marking.

The cylinder pressure gauge, and the parts of this product used in measuring the cylinder pressure, meet the requirements set in the section of the European Standard EN 250 that concern cylinder pressure measurements. The instruments must be serviced by an authorized Suunto representative every second year or after 200 dives (whichever comes first).

EN 13319 ”Diving accessories – Depth gauges and combined depth and time measuring devices – Functional and safety requirements, test methods” is a European diving depth gauge standard. The Suunto Cobra2 is designed to comply with this standard.

11.3. Limits of liability and ISO 9001 compliance

Suunto Oy does not assume any responsibility for losses or claims by third parties, which may arise through the use of this device.

Due to continuous product development, the Suunto Cobra2 is subject to change without notice.

ISO 9001

Suunto Oy’s Quality Assurance System is certified by Det Norske Veritas to be in accordance with ISO 9001 in all Suunto Oy's operations (Quality Certificate No. 96-HELAQ-220).

11.4. After sales service

If a claim under warranty appears to be necessary, return the product, freight prepaid, to your Suunto representative, who is responsible for having your product repaired or replaced. Depending on the requirements in your country, include your name, address, proof of purchase and/or Warranty card, which can be found at the back of this manual. The claim will be honored and the product repaired or replaced at no charge and returned in what your Suunto representative determines a reasonable amount of time, provided that all necessary parts are in stock. All repairs that are not covered under the terms of this warranty will be made at the owner's expense. This warranty is non-transferable from the original owner.

You can locate your local Suunto representative at www.suunto.com.

12. WARRANTY

NOTE

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

www.suunto.com. 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.

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

Altitude dive

Ascent rate

ASC RATE

Ascent time

ASC TIME

Ceiling

Ceiling zone

Central nervous system toxicity

CNS

CNS%

Compartment

DAN

DCI

Decompression

Decompression range

Decompression illness

Dive series

Dive time

ΔP

EAD

EAN

Enriched air nitrox

Equivalent air depth

Floor

Half time

The amount of dive time remaining, based ona calculationof 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 ona 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 "thebends" 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).

Multi level dive

Nitrox

NOAA

No decompression time

No decompression dive

NO DEC TIME

OEA = EAN = EANx

OLF

OTU

Oxygen tolerance unit

Oxygen limit fraction

O2%

Oxygen partial pressure

RGBM

Reduced Gradient Bubble Model

Repetitive dive

Residual nitrogen

SURF TIME

Surface interval time

Tissue group

Whole-body toxicity

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.

In sports diving, refers to any mix with a higher fraction of oxygen than standard

air.

United States National Oceanic and Atmospheric Administration.

The maximum amount of time a diver may remain at a particular depth without

having to make decompression stops during the subsequent ascent.

Any dive which permits a direct, uninterrupted ascent to the surface at any

time.

Abbreviation for no decompression time limit.

Abbreviations for oxygen enriched air nitrox.

Abbreviation for oxygen limit fraction.

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.

Limits the maximum depth to which the nitrox mixture can be safely used. The

maximum partial pressure limit for enriched air diving is 1.4 bar. The contingency

partial pressure limit is 1.6 bar. Dives beyond this limit risk immediate oxygen

toxicity.

Abbreviation for oxygen partial pressure.

Abbreviation for Reduced Gradient Bubble Model.

Modern algorithm for tracking both dissolved and free gas in divers.

Any dive whose decompression time limits are affected by residual nitrogen

absorbed during previous dives.

The amount of excess nitrogen remaining in a diver after one or more dives.

Abbreviation for surface interval time.

Elapsed time between surfacing from a dive and beginning a descent for the

subsequent repetitive dive.

Theoretical concept used to model bodily tissues for the construction of

decompression tables or calculations.

Another form of oxygen toxicity, which is caused by prolonged exposure to

high oxygen partial pressures. The most common symptoms are irritation in

the lungs, a burning sensation in the chest, coughing and reduction of the vital

capacity. Also called Pulmonary Oxygen Toxicity. See also OTU.

to the restrictions given in the instruction

manual. This warranty does not cover

the damage to the product resulting from

improper usage, improper maintenance,

neglect of care, alteration, improper battery

replacement or unauthorized repair.

Suunto’s dive computers and wristop

computers can be registered online at

www.suunto.com.

Name

Address

City Country

Telephone E-mail

Signature

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

Store stamp with date of purchase

the original purchase receipt and make sure

Store City Store Country

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

Date of purchase

Place of purchase/Store name

TWO YEAR WARRANTY

Model of Serial

Dive Computer number:

SUUNTO Cobra2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. WELCOME TO THE WORLD OF SUUNTO DIVING INSTRUMENTS

2. WARNINGS, CAUTIONS, AND NOTES

3. SUUNTO COBRA2 AT A GLANCE

3.1. Navigating in the menus

3.2. Button symbols and functions

4. GETTING STARTED WITH YOUR SUUNTO COBRA2

4.1. TIME mode settings

4.1.1. Setting the alarm

4.1.2. Setting the time

4.1.3. Setting the date

4.1.4. Setting the units

4.1.5. Setting the backlight

4.1.6. Setting the tones

4.2. AC water contacts

4.3. Learning how to use your compass

4.3.1. Compass display

Tilt sensor

4.3.2. Locking a bearing

4.3.3. Compass settings

Declination

Calibration

5. BEFORE DIVING

5.1. The Suunto RGBM/Deep Stop Algorithm

5.2. Emergency ascents

5.3. Dive computer limitations

5.4. Nitrox

5.5. Audible and visual alarms

5.6. Error conditions

5.7. Air integration

5.7.1. Connecting Suunto Cobra2 to a regulator

5.8. DIVE mode settings

5.8.1. Setting the depth alarm

5.8.2. Setting the dive-time alarm

5.8.3. Setting the nitrox values

5.8.4. Setting the personal/altitude adjustments

5.8.5. Setting the sample rate

5.8.6. Setting the Safety Stops/Deep Stops

5.8.7. Setting the RGBM values

5.9. Activation and pre-checks

5.9.1. Accessing DIVE mode

5.9.2. DIVE mode activation

5.9.3. Battery power indication

5.9.4. Diving at altitude

5.9.5. Personal adjustments

5.10. Safety Stops

5.10.1. Recommended Safety Stops

5.10.2. Mandatory Safety Stops

5.11. Deep stops

6. DIVING

6.1. Diving in AIR mode (DIVEair)

6.1.1. Basic dive data

6.1.2. Bookmark

6.1.3. Tank pressure data

6.1.4. Ascent rate indicator

6.1.5. Safety Stops

6.1.6. Decompression dives

Ceiling, ceiling zone, floor and decompression range

Display below the floor

Display above the floor

Display at the ceiling zone

Display above the ceiling

6.2. Diving in NITROX mode (DIVEnitrox)

6.2.1. Before diving in NITROX mode

Default nitrox settings

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)

7. AFTER DIVING

7.1. Surface interval

7.2. Dive numbering

7.3. Repetitive dive planning

7.4. Flying after diving

7.5. PLAN mode

7.5.1. Dive Planning mode (PLANnodec)

Dive numbering shown during dive planning