Suunto Cobra 3 Operation Manual

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COBRA3

USER’S GUIDE

Time Tank pressure

1. WELCOME TO THE WORLD OF SUUNTO DIVE COMPUTERS .. . . . . . .... . . . . . . 7

2. WARNINGS, CAUTIONS, AND NOTES . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . . 8

3. SUUNTO USER INTERFACE . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . 17

3.1. Navigating in the menus .. . . . . . . . .... . . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . 17

3.2. Button symbols and functions . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . 19

4. GETTING STARTED .. . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . 21

4.1. TIME mode settings . . . .... . . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . 21

4.1.1. Setting the alarm . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . 22

4.1.2. Setting the time .... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . . . . . . . . 22

4.1.3. Setting the date . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . 23

4.1.4. Setting the backlight ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . 23

4.1.5. Setting the tones ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . 24

4.2. AC water contacts .. ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . 24

4.3. Learning how to use your compass ... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . 25

4.3.1. Compass display . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . 26

4.3.2. Locking a bearing ...... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . 27

4.3.3. Compass settings .. . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . . . . . . . . ..... . . . . . . . . . 28

5. BEFORE DIVING . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . ... 32

5.1. The Suunto RGBM/Deep Stop Algorithm . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . 32

5.2. Emergency ascents . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... 33

5.3. Dive computer limitations .. . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . 34

5.4. Audible and visual alarms .... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . 34

5.5. Error conditions . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ... 37

5.6. Air integration . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . 38

5.6.1. Connecting Suunto Cobra3 to a regulator . . . . ..... . . . . . . . . .... . . . . . . . . ... 38

5.7. DIVE mode settings .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . 39

5.7.1. Setting the depth alarm .. .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . 40

5.7.2. Setting the dive-time alarm .... . . . . . . . . .... . . . . . . . . . .... . . . . . . . . ..... . . . . . . 40

5.7.3. Setting the nitrox values .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . 41

5.7.4. Setting the personal/altitude adjustments . . . . . .... . . . . . . . . ..... . . . . . . . . .. 42

5.7.5. Setting the sample rate . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . 42

5.7.6. Setting the Safety Stops/deep stops . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... 43

5.7.7. Setting the RGBM values . . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ... 43

5.7.8. Setting the units . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . 44

5.7.9. Setting the tank pressure alarm .. . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . 44

5.8. Activation and pre-checks .. . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . 45

5.8.1. Accessing DIVE mode .... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... 45

5.8.2. DIVE mode activation . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . .... 46

5.8.3. Battery power indication . . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . 47

5.8.4. Diving at altitude . . . . .... . . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . 48

5.8.5. Personal adjustments .. ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .. 49

5.9. Safety Stops .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . . . . 52

5.9.1. Recommended Safety Stops .. . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . 52

5.9.2. Mandatory Safety Stops . . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . 53

5.10. Deep stops . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .. 55

6. DIVING .. . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ... 56

6.1. Diving in the AIR mode (DIVE Air) . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... 56

6.1.1. Basic dive data .. . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . 56

6.1.2. Bookmark ...... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . ... 58

6.1.3. Tank pressure data . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . . . . . . . . .... 59

6.1.4. Ascent rate indicator . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . ... 61

6.1.5. Safety Stops . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . 62

6.1.6. Decompression dives . . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . 62

6.2. Diving in NITROX mode (DIVE Nitrox) . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . 67

6.2.1. Before diving in the NITROX mode ... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ... 67

6.2.2. Oxygen displays .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . 69

6.2.3. Oxygen limit fraction (OLF%) .. . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . 70

6.2.4. Gas change and multiple breathing gas mixes . . . . .... . . . . . . . . ..... . . . . . 71

6.3. Diving in the GAUGE mode (DIVE Gauge) .... . . . . . . . . ..... . . . . . . . . .... . . . . . . 72

7. AFTER DIVING .... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . 74

7.1. Surface interval ... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . 74

7.2. Dive numbering . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ... 75

7.3. Repetitive dive planning . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... 76

7.4. Flying after diving . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . 76

7.5. PLAN mode . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ... 77

7.5.1. DIVE PLANNING mode (PLAN NoDec) . . . . . . . ..... . . . . . . . . ..... . . . . . . . . . 78

7.5.2. Simulation Mode (PLAN Simulator) . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . 80

7.6. MEMORY mode . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . 81

7.6.1. Dive logbook (MEM Logbook) . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... 82

7.6.2. Dive history (MEM History) . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . 84

7.7. Suunto DM4 with Movescount . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . 85

7.8. Movescount . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . 87

8. CARE AND MAINTENANCE OF MY SUUNTO DIVING COMPUTER . . . . ..... . 88

9. BATTERY REPLACEMENT .. . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . 91

9.1. Battery kit . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . 91

9.2. Required tools .. ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . . . . . . . . .... 92

9.3. Replacing the battery . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . 92

10. TECHNICAL DATA . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . .. 95

10.1. Technical specifications .. . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . 95

10.2. RGBM ... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . .. 98

10.2.1. Suunto RGBM adaptive decompression . . . . .... . . . . . . . . ..... . . . . . . . . ... 99

10.2.2. No-decompression limits for air . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . 100

10.2.3. Altitude diving .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .... . . . . . . . . ..... . . . . . . 102

10.3. Oxygen exposure . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . 103

11. INTELLECTUAL PROPERTY .. . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . 104

11.1. Trademark . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . 104

11.2. Copyright . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . 104

11.3. Patent notice ...... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . . .. 104

12. DISCLAIMERS .... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . 105

12.1. CE .. . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . 105

12.2. EN 13319 .. . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . 105

12.3. EN 250 / FIOH . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . 105

13. SUUNTO LIMITED WARRANTY . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . 106

14. DISPOSAL OF THE DEVICE . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . ..... . . . . . 108

GLOSSARY .. . . . . . . . ..... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . . . . . . . . .... . . . . . . . . ..... . 109

1. WELCOME TO THE WORLD OF SUUNTO DIVE COMPUTERS

Suunto Cobra3 wristop dive computer is 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 Cobra3 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.

The Suunto Cobra3 User's Guide contains vitally important information which enables you to become familiar with your Suunto wristop dive computer. To understand the use, displays, and limitations of the instrument before using it, please read this user's guide carefully, and save it for further reference. Note also that a glossary is included at the back of the user's guide to help you understand dive-specific terminology.

2. WARNINGS, CAUTIONS, AND NOTES

Throughout this user's guide, 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 may result in serious injury or death

CAUTION

NOTE

Before you go on to read the user's guide itself, it is extremely important that you read the following warnings. These warnings are intended to maximize your safety while using Suunto Cobra3 and must not be ignored.

WARNING

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

is used to emphasize important information

YOU MUST READ the leaflet and user guide for your dive computer. Failure to do so may lead to improper use, serious injury or death.

ALLERGIC REACTIONS OR SKIN IRRITATIONS MAY OCCUR WHEN PRODUCT IS IN CONTACT WITH SKIN, EVEN THOUGH OUR PRODUCTS COMPLY WITH INDUSTRY STANDARDS. IN SUCH EVENT, STOP USE IMMEDIATELY AND CONSULT A DOCTOR.

WARNING

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 not be used for any commercial or professional diving activities.

WARNING

ONLY DIVERS TRAINED IN 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 a diver 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 OR DIVE TABLEWILL 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 measure of safety, 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! Exposure to greater depths increases the risk of oxygen toxicity and decompression illness.

WARNING

DIVES WITH REQUIRED DECOMPRESSION STOPS ARE NOT RECOMMENDED. YOU SHOULD ASCEND AND BEGIN DECOMPRESSION IMMEDIATELY WHEN THE DIVE COMPUTER SHOWS YOU THAT A DECOMPRESSION STOP IS REQUIRED! Note the blinking ASC TIME symbol and the upward pointing arrow.

USE BACK-UP INSTRUMENTS! Ensure 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, the device has not run out of battery power, and that the oxygen, altitude, personal, RGBM adjustments, and Safety/Deep Stop are correct.

WARNING

YOU ARE ADVISED TO AVOID FLYING ANY TIME THE COMPUTER COUNTS DOWN THE NO-FLY TIME. ALWAYS ACTIVATE THE COMPUTER TO CHECK THE REMAINING NO-FLY TIME PRIOR TO FLYING! Flying or traveling to a higher altitude within the no-fly time can greatly increase the risk of DCI. Review the recommendations given by Divers Alert Network (DAN). There can never be a flying after diving rule that is guaranteed to completely prevent decompression illness!

WARNING

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.

WARNING

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 there is a desire 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.

WARNING

SET THE CORRECT ALTITUDE ADJUSTMENT MODE! When diving at altitudes greater than 300 m/1000 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 3000 m/10000 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

SET THE CORRECT PERSONAL ADJUSTMENT MODE! 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.

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).

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/min / 33 ft/min or

• make your decompression stop deeper than at the ceiling These factors will also increase the amount of air required to

reach the surface.

WARNING

NEVER ASCEND ABOVE THE CEILING! You must not ascend above the ceiling during your decompression. In order to avoid doing so by accident, you should stay somewhat below the ceiling.

WARNING

DO NOT DIVE WITH A CYLINDER OF ENRICHED AIR IF YOU HAVE NOT PERSONALLY VERIFIED ITS CONTENTS AND ENTERED THE ANALYSIS 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.

DO NOT DIVE WITH A GAS 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 gas values where applicable into your dive computer will result in incorrect dive planning information.

Diving with gas mixtures 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.

WARNING

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.

WARNING

WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE MAXIMUM LIMIT IS REACHED, YOU MUST IMMEDIATELY TAKE ACTION TO REDUCE OXYGEN EXPOSURE. Failure to take action to reduce oxygen exposure after the warning is given can rapidly increase the risk of oxygen toxicity, injury, or death

Suunto also recommends that you receive training in Free diving techniques and physiology before conducting breath hold dives. No dive computer can replace the need for proper dive training. Insufficient or improper training may cause a diver to commit errors that may lead to serious injury or death.

Using the Suunto Dive Planner software is not a substitute for proper dive training. Diving with mixed gases has dangers that are not familiar to divers diving with air. To dive with trimix, triox, heliox and nitrox or all of them, divers must have specialized training for the type of diving they are doing.

WARNING

Always use realistic SAC rates and conservative turn pressures during dive planning. Overly optimistic or erroneous gas planning can result in the exhaustion of breathing gas during decompression or in a cave or a wreck.

WARNING

NOTE

In GAUGE mode the no-fly time is always 48 hours.

ENSURE THE WATER RESISTANCE OF THE DEVICE! Moisture inside the device or battery compartment will seriously damage the unit. Only an authorized SUUNTO dealer or distributor should do service activities.

It is not possible to change between AIR, NITROX and GAUGE modes before the instrument has counted down the no-fly time. There are, however, exceptions to this: You can change from AIR to NITROX mode, as well as from AIR or NITROX mode to GAUGE 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.

3. SUUNTO USER INTERFACE

3.1. Navigating in the menus

Suunto Cobra3 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 is explained in more detail in the relevant sections of the user's guide.

Table 3.1. Button symbols and functions

Main functionsPressButtonSymbol

ShortMODE

LongMODE

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

Activate backlight in other modes Activate stopwatch in DIVE mode

ShortSELECT

Select a submode Select and accept settings Select stopwatch to stop or start in DIVE mode

Activate compass in TIME and DIVE modesLongSELECT

Main functionsPressButtonSymbol

ShortUP

Toggle between alternative displays Change submode Increase values

Activate 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

USE UP AND DOWN BUTTONS

TO TOGGLE BETWEEN ALARM, TIME,

DATE, UNITS, BACKLIGHT

AND TONES.

To get the most out of your Suunto Cobra3, use 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 Cobra3 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 to do with your Suunto Cobra3, is to modify the TIME mode settings: the time, alarm, date, units, backlight, and tones.

NOTE

The figure below shows how to enter the TIME Settings menu.

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

4.1.1. Setting the alarm

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

The dive computer has a daily alarm function. When the daily alarm activates, the screen blinks and the alarm sounds for 60 seconds. Press any button to stop the alarm.

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 a 12 and 24 hour display.

4.1.3. Setting the date

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

In the Date setting mode, you are able to set the year, month, and day. The day of the week is automatically calculated in accordance with the date. In metric units the date is presented as DD/MM, and in imperial units as MM/DD.

4.1.4. Setting the backlight

In the Backlight setting mode, you are able 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.

4.1.5. Setting the tones

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

In the Tones setting mode, you are able to activate or deactivate the tones.

NOTE

When the tones are off, there are no audible 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. Therefore, it is 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 Cobra3 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.

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.

NOTE

When accessed from DIVE mode, toggle between the alternative displays by pressing the UP/DOWN buttons.

4.3.1. Compass display

The Suunto Cobra3 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.

4.3.2. Locking a bearing

TO LOCK A BEARING,

PRESS SELECT.

A bearing can be locked to help you follow a selected course, and directional arrows point towards the locked bearing. The last locked bearing is stored and is available the next time the compass is activated. In the DIVE mode the locked bearings are also stored in the log.

The Suunto Cobra3 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

ExplanationSymbol

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 (Calibration, Declination and Timeout) in the COMPASS mode:

Calibration

Because of changes in the surrounding magnetic field, the Suunto Cobra3 electronic compass occasionally needs to be re-calibrated. During the calibration process, the compass adjusts itself to the surrounding magnetic field and to tilting. As a basic rule, you should calibrate the compass whenever it does not seem to operate properly, or after replacing the dive computer's battery.

First the compass is level calibrated and after a successful level calibration, the compass is tilt calibrated. The tilt calibration compensates for tilting the compass in any direction in angles of up to 45°.

Strong electromagnetic fields, such as power lines, stereo speakers, and magnets can affect the compass calibration. Therefore, it is advisable to calibrate the compass if your Suunto Cobra3 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 Cobra3 level during the level calibration process. A deviation of ± 5° is allowed in any direction from the horizontal plane during level calibration.

To calibrate the compass:

HOLD THE

DEVICE LEVEL AND SLOWLY ROTATE 360°.

HOLD THE DEVICE STILL AND SLOWLY TILT 90°

VERTICALLY.

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, power lines 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.

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.

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

Time-out

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

You can set the compass time-out to 1, 3, or 5 minutes. After the set time has passed from the latest button press, the dive computer returns to the TIME or DIVE mode from the COMPASS mode.

You can exit the COMPASS mode also by long pressing the SELECT button.

5. BEFORE DIVING

Do not attempt to use the dive computer without reading this user's guide 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 dive computer, contact your SUUNTO dealer before diving with the dive computer.

Always remember that YOU ARE RESPONSIBLE FOR YOUR OWN SAFETY! When used properly, Suunto Cobra3 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 Cobra3, 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 Cobra3 uses traditional recommended safety stops as well as deep stops.

YOU ARE ADVISED TO MAKE A

DEEPSTOP AT 18 M. THE SECOND INDICATOR SHOWS THAT YOU HAVE 110 SECONDS LEFT OF YOUR DEEPSTOP.

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 10.2. 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

2. a 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 sur-

3. face, do not dive for at least 24 hours.

5.3. Dive computer limitations

While the dive computer is based on current decompression research and technology, you must 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. Audible and visual alarms

The dive computer has 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.

The visual information on the dive computer display is shown during the alarm breaks in order to save battery.

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.

Alarm reasonAlarm type

Three beeps with a three second interval

Three beeps with a three second interval and activated backlight

Continuous beeps and activated backlight

You can set alarms for maximum depth, dive time and tank pressure. For more information, refer to Section 5.7. DIVE mode settings and Section 4.1. TIME mode settings.

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.

Table 5.2. Preset alarm types

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.

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 PO2value. You should immediately ascend above the PO2depth 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 maximum depth has been exceeded.

Preset dive time has been exceeded.

Preset alarm time is reached.Continuous beep series for 24 seconds or until any

Alarm reasonAlarm type

NOTE

When the backlight is turned OFF, it does not illuminate when an alarm is activated.

WARNING

5.5. 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, for example, 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 enters a permanent Error mode. The instrument will continue to function normally if you descend below the ceiling within this three-minute period.

When the dive computer is in the permanent Error mode, only the Er warning is shown in the center window. The dive computer does not show times for ascent or stops. However, all the other displays function as before to provide information for ascent. You must 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 is displayed in the center window and the planning mode is disabled.

5.6. Air integration

The Cobra3 can be attached to the high-pressure port of the regulator, enabling you to receive cylinder pressure and remaining air time data.

5.6.1. Connecting Suunto Cobra3 to a regulator

When purchasing the Suunto Cobra3, 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

1. an appropriate tool. Thread the high pressure hose of the Suunto Cobra3 into the HP port of your

2. regulator with your fingers. Tighten the hose fitting with a 16 mm (5/8'') wrench. DO NOT OVERTIGHTEN! Attach the regulator to the scuba cylinder and slowly open the valve. Check for

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

5.7. DIVE mode settings

USE UP AND DOWN BUTTONS

TOGGLE BETWEEN DIVE SETTINGS

Suunto Cobra3 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 submode chosen (AIR, NITROX, GAUGE), so that, for example, nitrox settings are only available in the NITROX submode.

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

NOTE

Some settings cannot be changed until five (5) minutes has elapsed after the dive.

5.7.1. Setting the depth alarm

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

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

5.7.2. Setting the dive-time alarm

The Dive Time Alarm setting can be activated and used for several purposes to add to your diving safety.

NOTE

With a range of 1–999 minutes, the alarm can be set to your planned bottom time, for example.

5.7.3. Setting the nitrox values

ADJUST WITH

UP AND DOWN BUTTONS. ACCEPT WITH

SELECT BUTTON.

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

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 maximum operating depth (MOD), 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 enable the mixes you actually have available, and remember to check the set values to ensure 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

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

If MIX2 is set ON, settings for all mixes are stored until changed. If MIX2 has an oxygen content of 22% or greater, settings for all mixes are stored until changed.

5.7.4. 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 (refer to Section 5.8.4. Diving at altitude and Section 5.8.5. Per- sonal 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.

5.7.5. Setting the sample rate

The Sample Rate setting controls how often the depth, tank pressure (if enabled), and water temperature is stored in the memory.

You can set the dive profile sample rate to 1, 10, 20, 30, or 60 seconds. The factory default setting is 20 seconds.

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

5.7.6. Setting the Safety Stops/deep stops

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

In the AIR mode in the Deep Stops setting mode, the Deep stops can be set “ON” or “OFF” depending on whether the Deep stops are used or not.

The Deep Stop setting allows you to view deep stops. If deep stops are set OFF, only the traditional Safety Stop calculation is used.

5.7.7. 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%).

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

5.7.8. Setting the units

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

In the Unit settings you are able to choose between metric (meters/Celsius/bar) and imperial (feet/Fahrenheit/psi) units.

5.7.9. Setting the tank pressure alarm

The tank pressure alarm can be set "ON" or "OFF" and in the range of 10–200 bar. The alarm is the secondary cylinder pressure alarm point. The alarm is activated when the tank pressure drops below the set limit. You can acknowledge this alarm.

The 50 bar/700 psi alarm, however, is fixed and cannot be changed. You cannot acknowledge this alarm.

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

5.8. 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.

5.8.1. Accessing DIVE mode

The Suunto Cobra3 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 and for freediving.

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.

5.8.2. 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, and so on.

After activation, all graphical display elements are turned ON, 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, and ensure 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, 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, ensure 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 correct oxygen percentages are adjusted according to the measured oxygen

• percentages in your cylinders the oxygen partial pressure limits are set correctly

•

For more information on the NITROX mode, please refer to Section 6.2. Diving in NI- TROX mode (DIVE Nitrox).

The dive computer is now ready for diving.

5.8.3. 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, reenter 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

5.8.4. 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.

For more information, see Section 10.2.3. Altitude diving.

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

Table 5.4. Altitude Adjustment settings

value

Altitude rangeAlt. adjustment

0–300 m / 0–1000 ftA0

300–1500 m / 1000–5000 ftA1

1500–3000 m / 5000–10 000 ftA2

NOTE

WARNING

5.8.5. 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. There is available a threestep Personal Adjustment setting if a more conservative dive plan is desired, and a two-step adjustment for RGBM effect on repetitive dives for very experienced divers.

Section 5.7.4. Setting the personal/altitude adjustments describes how the Altitude value is set.

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

• patent foramen ovale (PFO)

• exercise on or after dive

•

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 (refer to Section 10.2.2. No-

decompression limits for air, Table 10.1, No-decompression time limits for various depths (m) and Table 10.2, No-decompression time limits for various depths (ft) ).

Table 5.5. Personal Adjustment settings

Personal adjustment value

The Suunto Cobra3 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. for more information, refer to Table 5.6, RGBM model settings.

Table 5.6. RGBM model settings

100%

exist

Several risk factors or conditions exist

Standard Suunto RGBM model (Default)

Desired tablesCondition

DefaultIdeal conditions

Progressively more conservativeSome risk factors or conditions

EffectDesired TablesRGBM setting

Full RGBM effects

EffectDesired TablesRGBM setting

Smaller RGBM effects, higher risk!Attenuated RGBM model50%

5.9. 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 Cobra3 displays two different types of Safety Stops: Recommended Safety Stop and Mandatory Safety Stop.

5.9.1. 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 3–6 m/10–20 ft range. This is shown with the STOP sign and a three-minute countdown in the center window instead of the no-decompression time.

WHEN STOP IS DISPLAYED,

MAKE A RECOMMENDED SAFETY

STOP FOR 3 MINUTES.

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.

5.9.2. Mandatory Safety Stops

When the ascent rate exceeds 10 m/33 ft per minute continuously for more than five (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 is shown 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. 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.

WHEN CEILING AND STOP ARE

DISPLAYED, MAKE A ONE MINUTE

MANDATORY SAFETY STOP IN THE

DEPTH ZONE BETWEEN 6 M AND 3 M.

You must not ascend shallower than 3 m/10 ft with the Mandatory Safety Stop warning

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

TO OR BELOW CEILING.

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.

5.10. 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.

6. DIVING

DIVE HAS JUST BEGUN AND

AVAILABLE NO-DECOMPRESSION

TIME IS OVER 99 MINUTES SO NO

VALUE IS DISPLAYED.

This section contains instructions on how to operate the dive computer and interpret its displays. The dive computer is easy to use and read. Each display shows only the data relevant to that specific diving mode.

6.1. Diving in the AIR mode (DIVE Air)

This section contains information on diving with standard air. To activate the DIVE Air mode, please refer to Section 5.8.1. 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 SURFACE mode manually before entering the water 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

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.

• 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) the Deep Stop depth, if activated

• the Remaining air time

•

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 tank pressure

• the current time, shown as TIME

•

DOWN BUTTON TOGGLES BETWEEN MAXIMUM DEPTH, CURRENT TIME AND TANK PRESSURE.

UP BUTTON TOGGLES BETWEEN DIVE TIME AND WATER TEMPERATURE.

6.1.2. Bookmark

It is possible to record bookmarks in the profile memory during a dive. These bookmarks are displayed when scrolling the profile memory on the display. The bookmarks are also shown as annotations in the downloadable Suunto DM4 with Movescount 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.

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

THE SELECT BUTTON.

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 is based on constant one second interval pressure measurements over 30–60 second periods. An increase in air consumption influences the remaining air time rapidly, while a drop in air consumption increases 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/700 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

Low Air Pressure Warnings

The dive computer will warn you with three (3) audible double beeps and a blinking pressure display when the cylinder pressure reaches 50 bar/700 psi.

Three (3) double beeps are also heard when the cylinder pressure goes down to the user-selected alarm pressure, and when the remaining air time reaches zero.

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

6.1.4. Ascent rate indicator

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 ascent rate is shown 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.

Continuous ascent rate violations will result in Mandatory Safety Stops. When Recommended Deep Stop is enabled, the length is indicated in seconds.

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).

6.1.5. Safety Stops

A three (3) minute Recommended Safety Stop is prompted after every dive to over 10 m.

6.1.6. Decompression dives

When your NO DEC TIME becomes zero, your dive changes into a decompression dive. Therefore, 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 at the deep stop

• the time needed to ascend to the ceiling at an ascent rate of 10 m/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 mandatory decompression dives

• have been completed

NOTE

In addition, there may also be Mandatory Safety Stops which are not displayed in ASC TIME.

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 decom-

• pression. 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 1.2 m/4 ft below the minimum ceiling. The floor is the deepest depth at which the decompression stop time will not in-

• crease. 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 or

•

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 depends 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 ensure 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

It will take more time and more air to decompress below the ceiling than at the ceiling.

WARNING

NEVER ASCEND ABOVE THE CEILING! You must not ascend above the ceiling during your decompression. In order to avoid doing so by accident, you should stay somewhat below the ceiling.

Display below the floor

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.

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

THE DECOMPRESSION RANGE.

The blinking ASC TIME sign 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.

Display above the floor

When you ascend above the floor, the ASC TIME sign 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. Therefore, you should continue your

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.

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 (3) 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.

DECOMPRESSION DIVE, ABOVE CEILING.

NOTE DOWNWARD POINTING ARROW, ER WARNING

AND ALARM. YOU SHOULD IMMEDIATLY (WITHIN

3 MINUTES) DES CEND TO OR BELOW CEILING.

In addition, an Error warning (Er) reminds you that you have only three (3) 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 (refer to Section 5.5. Error conditions).

6.2. Diving in NITROX mode (DIVE Nitrox)

The NITROX mode (DIVE Nitrox) is the second dive mode available in Suunto Cobra3 and is used when using oxygen-enriched gas mixtures.

6.2.1. Before diving in the 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 5.7.3. Setting the nitrox values .

Default nitrox settings

In the NITROX mode, the Suunto Cobra3 allows you to set 1 or 2 nitrox mixes containing 21–99% oxygen.

In the NITROX mode, the default setting for Mix1 is standard air (21% 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

NITROX DIVE MODE ACTIVATION. MAXIMUM OPERATIONAL DEPTH BASED ON SET O

% (21%) AND PO2 (1.4 BAR) IS 56.7 M.

When the NITROX mode is activated, the display will show the information in the figure below. In the NITROX mode, the maximum operational depth is calculated based on set O2% and PO2values.

If set to the NITROX mode, the Suunto Cobra3 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 PO

, OLF, DIVE TIME AND WATER TEMPERATURE.

DOWN BUTTON

TOGGLES

BETWEEN O

, MAXIMUM DEPTH TANK PRESSURE

AND CURRENT

TIME.

6.2.3. Oxygen limit fraction (OLF%)

If set to the 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

CHANGING GAS MIX. SCROLL

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

PRESSING THE SELECT BUTTON.

calculations. The oxygen toxicity calculations are based on the factors listed in Section 10.3. Oxygen exposure .

6.2.4. Gas change and multiple breathing gas mixes

The Suunto Cobra3 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 whose set PO2is exceeded. In such a case, the mix is shown but cannot be selected.

NOTE

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.

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 PO level 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 the GAUGE mode (DIVE Gauge)

If set to the 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 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.

NOTE

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 Cobra3 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 or Too Long Bottom Time

Do Not Fly Symbol

7.1. Surface interval

An ascent to any depth shallower than 1.2 m/4 ft will cause the DIVE 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

• tank pressure

•

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, and so on.

If you start a new dive with less than five (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 five (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 Cobra3 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 (PLAN NoDec).

7.4. Flying after diving

In the DIVE mode, the no-fly time is displayed in the center window next to the airplane image. In the TIME mode, the airplane image is shown in the top left corner. 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 nofly 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 two (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 (PLAN Nodec) and simulation mode (PLAN Simulator).

7.5.1. DIVE PLANNING mode (PLAN NoDec)

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

When entering the PLAN nodec 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 99 min are displayed as “—“.

WHEN ENTERING THE PLANNODEC 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 5.5. Error conditions). The planning mode calculates no-decompression times for MIX1 only. If an additional mix is enabled in the NITROX mode, it does not affect the calculations in PLAN NoDec 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 5.8.4. Diving at altitude and in Section 5.8.5.

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 (PLAN Simulator)

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 SURFACE TIME IN

15 MINUTES INCREMENTS.

Add 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 (MEM Logbook) and dive history (MEM History).

The dive entry time and date is registered in the Logbook memory. Always check before diving that the time and date are correctly set, especially after travelling between different time zones.

7.6.1. Dive logbook (MEM Logbook)

The Suunto Cobra3 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:

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.

Page I, main display

maximum depth

• date of dive

• type of dive (AIR, NITROX, GAUGE)

• dive start time

• dive number

• oxygen percentage for Mix1

• total dive time (in minutes in all modes)

•

Page II

maximum depth

•

warnings

• consumed tank pressure

•

Page III

water temperature

• tank pressure

•

NOTE

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

7.6.2. Dive history (MEM History)

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

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.

DIVE HISTORY DISPLAY.

TOTAL NUMBER OF DIVES, DIVE

HOURS AND MAXIMUM DEPTH.

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 DM4 Dive Manager software.

7.7. Suunto DM4 with Movescount

The Suunto DM4 with Movescount (DM4) is an optional software that greatly enhances the functionality of your Suunto Cobra3. With the DM4 software, you can download dive data from your dive computer to your laptop. After that, you can view and organize all the data recorded with your Suunto Cobra3. You can plan dives (with Suunto Dive Planner), print copies of your dive profiles, and also upload your dive logs to share with your friends at http://www.movescount.com (see Section 7.8. Movescount). You can always download the latest version of the DM4 from http://www.suunto.com. Please check for updates regularly as new features are constantly being developed. The following data is transferred from your dive computer to your laptop (optional, cable required):

• 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 the NITROX mode)

• tissue calculation data

• real-time water temperature

• tank pressure data (if enabled)

• additional dive information (for example, SLOW and Mandatory Safety Stop violations, Diver Attention Symbol, Bookmark, Surfaced Mark, Decompression Stop Mark, and Ceiling Error Mark)

• dive computer serial number

• personal information (30 characters)

By using the DM4, you are able to enter setup options such as:

input a personal, 30-character field into the Suunto instrument.

• reset the Scuba History's maximum depth to zero

• reset all Free Dive History

• manually add comments, multimedia and other personal information to the PC-

• based dive data files

7.8. Movescount

Movescount is an online sports community that offers you a rich set of tools to manage all you sports and create engaging stories about your diving experiences. Movescount offers you new ways to get inspired and share your best dives with other community members!

To connect to Movescount:

Go to www.movescount.com.

1. Register and create your free Movescount account.

2. Download and install the Suunto DM4 with Movescount software from the

3. Movescount.com website if you do not already have the DM4 installed on your laptop

To transfer data:

Connect your dive computer to your laptop.

1. Download your dives to the DM4 on your laptop.

2. Follow the instructions on the DM4 on how to transfer your dives to your

3. Movescount.com account.

8. CARE AND MAINTENANCE OF MY SUUNTO DIVING COMPUTER

The SUUNTO dive computer is a sophisticated precision instrument. Although it is designed to withstand the rigors of scuba diving, you must treat it with the same proper care and caution as any other precision instrument.

WATER CONTACTS AND PUSH BUTTONS

• Contamination or dirt on the water contacts/connector or push buttons may prevent

the automatic activation of the Dive Mode and cause problems during the data transfer. Therefore, it is important that the water contacts and push buttons are kept clean. If the water contacts are active (AC text remains on display) or the Dive Mode activates on its own, the reason for this is probably contamination or invisible marine growth, which may create an 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. Sometimes it might be necessary to remove the instrument from the protective boot for cleaning. 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 dealer or distributor. This service will include a general operational check, replacement of the battery, and water resistance check. The service requires special tools and training. Therefore, it is advisable to contact an authorized SUUNTO dealer or distributor for service. Do not attempt to do any servicing that you are not sure of.

• Should moisture appear inside the case or battery compartment, immediately have the instrument checked by your SUUNTO dealer or distributor.

• Should you detect scratches, cracks or other such flaws on the display that may impair its durability, immediately have it replaced by your SUUNTO dealer or distributor.

• Wash and rinse the unit in fresh water after every use.

• Protect the unit from shock, extreme heat, direct sunlight, and chemical attack. 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, and so on. Chemical reactions with such agents will damage the seals, case and finish.

• Store your dive computer in a dry place when you are not using it.

• The dive computer will display 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.

• 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. Shorten the strap by cutting it if you do not expect to need the extra length.

MAINTENANCE

• The instrument should be soaked, thoroughly rinsed with fresh water, then dried

with a soft towel after each dive. Make sure that all salt crystals and sand particles have been flushed out. Check the display and the transparent battery compartment cover for possible moisture or water. DO NOT use the dive computer if you detect any moisture or water inside. In order to limit corrosion damage, remove the battery and moisture from the battery compartment. Contact an authorized Suunto dealer for battery replacement or other service.

CAUTION!

• Do not use compressed air to blow water off the unit.

• Do not use solvents or other cleaning fluids that might cause damage.

• Do not test or use the dive computer in pressurized air. 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 transparent battery compartment cover and 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 unless the instructions of this manual are carefully followed. In the event of a leak, immediately take the dive computer to an authorized SUUNTO dealer or distributor.

FAQs

For more information on service, please refer to FAQs on www.suunto.com.

9. BATTERY REPLACEMENT

NOTE

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 gas nitrox settings also revert back to default settings (Mix1 21% O2, 1.4 bar PO2, Mix2 OFF, Mix2-Mix8 OFF).

When working with the battery compartment, cleanliness is extremely important. Even the smallest dirt particles may cause a leakage when you dive.

9.1. Battery kit

The battery kit includes a 3.0 V coin type lithium cell battery and a lubricated O ring. 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 fingers.

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.

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.

9.2. Required tools

A Phillips-head screwdriver.

• Soft cloth for cleaning.

• Needlenose pliers or small screwdriver for turning securing ring.

•

9.3. Replacing the battery

The battery and the buzzer are located in the back of the instrument in a separate compartment. To change the battery:

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.

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

rotating it clockwise. You may use a pointed nose pliers or a small screwdriver as an aid in the rotating. Put the pliers ends into the holes of the securing ring or the screwdriver onto the side of the right tooth on the ring and turn the ring clockwise. Be careful not to damage any of the parts. Remove the ring.

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

pressing with your finger on the outermost edge of the lid while simultaneously pulling with your nail at the opposite side. Don't use sharp metal objects as they might damage the O-ring or the sealing surfaces. Remove the O-ring and the battery retainer.

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

surface.

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

8. for any other damage. In case of a leak or any other damage, bring the dive computer to an authorized SUUNTO dealer or distributor for check and repair. Check the condition of the O-ring; a defective O-ring may indicate sealing or

9. other problems. Dispose the old O-ring, even if it seems to be in good condition. Check that the battery compartment, battery holder and lid are clean. Clean with

10. soft 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

13. making sure that the O-ring is not at any point protruding out on the edge. Put your other thumb through the locking ring. Press this thumb firmly against the

14. lid and release the other one. Make sure that the lid is pressed completely down! Turn the locking ring counterclockwise with your free thumb and fingers until it

15. snaps 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.

10. TECHNICAL DATA

10.1. 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

• Calibrated complying 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 100 m/328 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

Cylinder pressure gauge:

• Rated working pressure: 300 bar/4000 psi, maximum allowed pressure

• Resolution: 1 bar/10 psi

Other displays

• Dive time: 0 to 999 min, counting starts and stops at 1.2 m /4 ft depth

• Surface time: 0 to 99 h 59 min

• Dive counter: 0 to 99 for repetitive dives

• No-decompression time: 0 to 99 min (- - after 99)

• Ascent time: 0 to 99 min (- - after 99)

• Ceiling depths: 3.0 to 100 m /10 to 328 ft

• Air time: 0 to 99 min (- - after 99)

Temperature display:

• Resolution: 1°C/1°F

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

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

Displays only in NITROX mode:

• Oxygen %: 21–99

• Oxygen partial pressure display: 0.2–3.0 bar.

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

Logbook/dive profile memory:

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

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

• Depth resolution: 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

Do not leave the dive computer in direct sunlight!

Tissue calculation model:

• Suunto 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

• Life expectancy at 20°C/68°F:

• 0 dives/year –> 3 years

• 100 dives/year –>1.5 years

• 300 dives/year –>1 year

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 (for example, temperat-

• ure/cold conditions). Below 10°C/50°F the expected battery lifetime is about 5075% 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

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

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

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.

Incorporating consistency with real physical laws for gas kinetics

•

10.2.1. 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.

10.2.2. No-decompression limits for air

The no-decompression limits displayed by the dive computer for the first dive to a single depth (see Table 10.1, No-decompression time limits for various depths (m) and Table 10.2, No-decompression time limits for various depths (ft) .), are slightly more conservative than those permitted by the U.S. Navy tables.

Table 10.1. No-decompression time limits for various depths (m)

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

Depth

(m)

9 12 15

18 21 24

27 30 33

100

205 124 71

51 37 29

22 17 13

148 77 51

34 26 19

13 10 8

for the first dive of a series

Personal Mode / Altitude Mode

133

181

108

160 93 59

43 31 25

19 14 11

120 63 42

29 21 16

11 9 6

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

76 46 29

20 13 9

7 5 4

Suunto Cobra 3 Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual