en COBRA USER’S GUIDE
Present Depth Dive Counter Bookmark Symbol m ft DIVE Diver Attention Symbol Bar Graph: - Mode Indicator - Consumed Bottom Time - Oxygen Limit Fraction NO O2%SURF S L O AVGPO2 MAX W STOP ASC TIME QUIT Do Not Fly Icon OK Remaining Air Time / Oxygen Percentage in Nitrox Mode Altitude Adjustment Mode Personal Adjustment Mode Fast Ascent Warning (SLOW) CEILING SELECT NO DEC TIME AIR TIME OLF C B T °F °Cbar psi OPTIONS DIVE TIME Cylinder Pressure Temperature Week Day Mode Text Scroll Button Indi
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 ................................................... 18 4. GETTING STARTED .................................................................. 20 4.1.
5.8.1. Accessing DIVE mode ...................................................... 5.8.2. DIVE mode activation ....................................................... 5.8.3. Battery power indication .................................................... 5.8.4. Diving at altitude ............................................................. 5.8.5. Personal adjustments ....................................................... 5.9. Safety Stops .......................................................................
7.3. Flying after diving ................................................................. 80 7.4. Memories and Data Transfer [1 MEMORY] .................................... 81 7.4.1. Logbook and Dive Profile Memory [1 LOGBOOK]) ..................... 82 7.4.2. Dive history Memory [2 HISTORY] ........................................ 88 7.4.3. Data Transfer and PC-Interface [3 TR-PC] ............................... 90 7.5. Movescount .......................................................................
11.1. Trademark ...................................................................... 11.2. Copyright ........................................................................ 11.3. Patent notice ................................................................... 12. DISCLAIMERS ...................................................................... 12.1. CE ............................................................................... 12.2. EN 13319 .........................................................
1. WELCOME TO THE WORLD OF SUUNTO DIVE COMPUTERS Suunto Cobra dive computer is designed to help you get the most out of your diving. The Cobra builds on the Suunto tradition of delivering feature-rich dive computers. The Cobra provides many new and enhanced features that cannot be found in any other air-integrated dive computer. Push button controls access a wide selection of choices. The display is optimized for the dive mode chosen.
2. WARNINGS, CAUTIONS, AND NOTES Throughout this user's guide, important safety icons are displayed.
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 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 PO2 OF 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.
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).
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.
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.
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.
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.
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 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.
3. SUUNTO USER INTERFACE 3.1. Navigating in the menus Suunto Cobra multipurpose dive computer features three dive computer modes (AIR, NITROX, GAUGE), three main operating modes (TIME/STAND-BY, SURFACE, DIVING), three menu based main modes (MEMORY, SIMULATION, SET) and 16–18 menu based submodes. You can scroll through the modes using the push buttons. The mode indicator at the left side and the mode text at the bottom of the display indicate the selected mode.
3.2. Button symbols and functions The list 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. The dive computer has easy-to-use push buttons and an advising display, which guides the user. The SMART (MODE) button is the key of the system. The two scroll buttons, PLAN and TIME, are used for scrolling up and down the menus and to get the alternative displays visible.
Activates the electroluminescent backlight (in the Surface mode hold down the mode button for more than two (2) seconds, during a dive for one (1) second). PLAN (arrow up) button • Activates the timekeeping display, if the display is blank. • Activates the Dive Planning in the Surface mode • Makes a special bookmark in the profile memory during a dive • Scrolls up the options ( increases values) TIME (arrow down) button • Activates the timekeeping display, if the display is blank.
4. GETTING STARTED To get the most out of your Suunto Cobra, use some time to personalize it and really make it YOUR computer. Set the correct time and date, the alarms,as well as the unit and backlight settings. The main menu based functions are grouped under 1) memory, 2) dive simulation and 3) setting modes. User options for the Cobra are selected by using the push buttons.
3.
THE USE OF THE MENU BASED FUNCTIONS 1. Activate the menu based modes by pressing once the SMART (MODE) button in the Dive Mode. Figure 4.1. Main menu based Mode options [3 MODE] 2. 22 Scroll the mode options by pressing the arrow up/ down buttons. When scrolling the options, the label and an equivalent number are shown on the display.
Figure 4.2. Scroll the mode options by pressing the arrow up/ down buttons. 3. 4. 5. 6. Press the SMART (Select) button once to select the desired option. Scroll the submode options by pressing the arrow up/down buttons. When scrolling the options, the label and an equivalent number are shown on the display. Select the desired option by pressing once the SMART (Select) button. Repeat the procedure, if there are more submodes.
By pressing the SMART button for more than 1 second, any menu based function or submode can be quit and the dive computer will return directly to the Dive Mode. 4.1. SET MODES [3 SET] The Set Modes include dive configuration and setup options that have to be set before the dive. The Set Modes are divided into three submodes for setting the dive-related parameters, time related parameters and your personal preferences.
4.1.1. Setting Time [2 SET TIME] To enter the Time Setting mode, select MODE- 3 SET- 2 SET TIME. The Time Setting mode has three options: 1 AdJ Time, 2 AdJ Date, and 3 T ALARM Daily Time Alarm. Adjusting Time [1 AdJ TIME] To enter the Time Setting mode, select MODE- 3 SET- 2 SET TIME- 1 AdJ TIME. After entering this mode you are able to select between 12 h and 24 hour time formats and set the correct time by using the SMART (MODE) and scroll buttons. Figure 4.4. Adjusting the Time setting.
NOTE The day of the week is automatically calculated in accordance with the date. The date can be set within the range of Jan 1, 1990 to Dec. 31, 2089. Figure 4.5. Adjusting the Date setting mode [2 AdJ DATE]. Adjusting Daily Alarm [3 T ALARM] You can set one daily alarm in the dive computer. When the daily alarm activates, the time symbol blinks for 1 minute and the alarm sounds for 24 seconds. The alarm is given at the preset time each day.
Figure 4.6. Adjusting the Daily Alarm setting mode [3 T ALARM] 4.1.2. Setting Preferences [3 SET PREF] To enter the Setting Preferences mode, select MODE- 3 SET- 3 SET PREF. The Time Setting mode has three options: 1 Time, 2 Date, and 3 Daily Time Alarm. Backlight Setting [1 LIGHT] In the Backlight Setting mode the backlight can be turned off or on and the on time can be set to be 5 to 30 seconds. To enter the Backlight Setting mode, select MODE- 3 SET- 3 SET PREF- 1 LIGHT.
Figure 4.7. Setting Backlight On Time. Press scroll buttons to change backlight on/off and to set time value. Dive Computer Units Setting (Metric/ Imperial) [2 UNITS] To enter the Dive Computer Units Setting mode, select MODE- 3 SET- 3 SET PREF2 UNITS. This will enable you to choose between metric and imperial units. Figure 4.8.
Dive Computer Model Settings (Air/Nitrox/Gauge) [3 MODEL] In the Dive Computer Model Setting mode the dive computer can be set to be an AIR computer, NITROX computer or a depth GAUGE with a timer. To enter the Dive Computer Model Setting mode, select MODE- 3 SET- 3 SET PREF3 MODEL. Figure 4.9. Setting Dive Computer model 4.2. AC water contacts The water contacts control the automatic activation of the Dive Mode. The water and data transfer contacts are located on bottom of the case.
Figure 4.10.
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.
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.
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 type Short single beep Alarm reason Dive computer is activated.
Alarm type Alarm reason Continuous beeps and activ- Maximum allowed ascent rate, 10 m per min/33 ft per min, is exceeded. Ascent rate bar graph blinks and ated backlight for five (5) STOP warning appears. seconds The Mandatory Safety Stop ceiling is exceeded. A downward pointing arrow 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.
Alarm type Alarm reason Continuous beep series for 24 seconds or until any button is pressed. Current time blinks for one minute if no button is pressed. Preset alarm time is reached. Table 5.3. Oxygen alarms in NITROX mode Alarm type Alarm reason Three double beeps and the The OLF bar graph reaches 80%. The segments exbacklight for five (5) seconds ceeding the 80% limit start to blink. The OLF bar graph reaches 100%. The OLF value will blink.
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. 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.
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 Cobra 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.
5.7. DIVE mode settings Suunto Cobra 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, settings are only available in the submode. The Set Modes [3 SET] include dive configuration and setup options that have to be set before the dive.
5.7.1. Setting the personal/altitude adjustments [1 AdJ MODE] The current Altitude and Personal Adjustment settings are displayed in the startup screen when diving at the surface. 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. Personal adjustments), it is imperative that you enter the correct selection before diving.
5.7.2. Setting the dive-time alarm [2 d ALARM] The Dive Time Alarm setting [2 d ALARM] can be activated and used for several purposes to add to your diving safety. To enter the Dive Time Alarm Setting mode, select MODE- 3 SET- 1 SET DIVE- 2 d ALARM. Figure 5.2. Setting Dive Time Alarm. Press scroll buttons to change alarm on/off and to set dive time value. NOTE With a range of 1–999 minutes, the alarm can be set to your planned bottom time, for example. 5.7.3.
To enter the Maximum Depth Alarm Setting, select MODE- 3 SET- 1 SET DIVE- 3 MAXDPTH. Figure 5.3. Setting Maximum Depth Alarm. Press scroll buttons to change alarm on/off and to set maximum depth value. 5.7.4. Setting the nitrox values [4 NITROX] 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. In addition, the oxygen partial pressure limit must be set.
Figure 5.4. Setting Oxygen Percentage and Partial Pressure. The equivalent maximum depth is displayed as 32.8 m /107 ft. Press scroll buttons to change oxygen percentage and to set oxygen partial setting value. 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.
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 cylinder pressure, altitude and personal adjustment settings, battery condition, oxygen settings, and so on. Press the SMART (On) button to activate the instrument. Figure 5.5. Startup I. All segments shown. After activation, all display elements will turn on showing mostly figure 8’s and graphical elements.
Figure 5.6. Startup II. Battery power indicator. 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 low battery indicator is not on. • the altitude and personal adjustment 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).
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 enriched air blends in your cylinders • the oxygen percentage is adjusted according to the measured Nitrox blend in your cylinder • the oxygen partial pressure limit is set correctly The dive computer is now ready for diving. 5.8.3.
Figure 5.7. Low Battery Warning. Battery symbol indicates that the battery is low and battery replacement is recommended. If the battery symbol is displayed in the Surface mode, or if the display is faded or weak, the battery may be too low to operate the dive computer, and battery replacement is recommended. NOTE For safety reasons, the backlight cannot be activated when the low battery warning is indicated by the battery symbol. 5.8.4.
Table 5.4. Altitude Adjustment settings Alt. adjustment Symbol on display value Altitude range A0 0–300 m / 0–1000 ft A1 300–1500 m / 1000–5000 ft A2 1500–3000 m / 5000–10 000 ft NOTE Section 5.7.1. Setting the personal/altitude adjustments [1 AdJ MODE] describes how the Altitude value is set. WARNING Traveling to a higher elevation can temporarily cause a change in the equilibrium of dissolved nitrogen in the body.
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.
Table 5.5. Personal Adjustment settings Personal ad- Sym- Condition justment bol on value Display Desired tables P0 Ideal conditions P1 Some risk factors or conditions exist Progressively more conservative P2 Several risk factors or conditions exist Default 5.9. Safety Stops Safety Stops are widely considered good diving practice for recreational diving, and are an integral part of most dive tables.
• • STOP + CEILING label, when in the depth range 3–6 m/10–20 ft = Mandatory Safety Stop Time display STOP label, when deeper than 6 m = Mandatory Safety Stop scheduled 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. Figure 5.8. Ascent rate indicator.
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.
You must not ascend shallower than 3 m/10 ft with the Mandatory Safety Stop warning on. If you ascend above the Mandatory Safety Stop ceiling, a downward pointing arrow will appear and a continuous beeping starts. You should immediately descend to, or below, the Mandatory Safety Stop ceiling depth. If you correct this situation at any time during the dive, there are no effects on the decompression calculations for future dives.
6. DIVING 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 AIR mode 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. Figure 6.1. The dive has just begun and no air time is shown.
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.
Figure 6.2. Diving display. Present depth is 19.3 m /63 ft and nodecompression stop time limit is 23 minutes in A0/P1 mode. Maximum depth during this dive was 19.8 m/65 ft, elapsed dive time is 16 minutes.
Figure 6.3. Diving display. Present cylinder pressure is 210 bar/3045 psi and remaining air time 41 minutes. Alternative display of current time and temperature is shown for 5 seconds after pressing TIME button. NOTE In Dive Mode the TIME / TEMPERATURE display automatically changes back to DIVE TIME / CYLINDER PRESSURE after five (5) seconds. 6.1.2. Bookmark It is possible to make special marks in the profile memory during a dive.
Figure 6.4. Bookmark activation. An annotation, Bookmark, is placed in the profile memory during a dive by pressing PLAN button. Note Logbook symbol. 6.1.3. Cylinder 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.
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.
Figure 6.5. Cylinder pressure warnings. Pressure has dropped below 50 bar /725 psi. Pressure display is blinking and there is an audible alarm. 6.1.4. Consumed Bottom Time (CBT) The available no-decompression time is also shown visually in the multi-function bar graph on the left side of the display. When your available no-decompression time decreases below 200 minutes, the first (lowest) bar graph segment appears. As your body absorbs more nitrogen, more segments start to appear.
Red Zone– As all of the bars appear (red zone), your no-decompression stop time has become zero and your dive has become a decompression stop dive (for more information see Section 6.1.6. Decompression dives). 6.1.5. Ascent rate indicator The ascent rate is displayed graphically along the right hand side with a vertical bar.
When the maximum allowed ascent rate is exceeded the fifth SLOW warning segment and the STOP sign appear and the depth reading starts to blink indicating that the maximum ascent rate has been exceeded continuously or that the ascent rate is above the allowed maximum rate. Whenever the SLOW warning segment and the STOP sign appear, you should immediately slow down your ascent.
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). 6.1.6. Decompression dives When your NO DEC TIME becomes zero, your dive changes into a decompression dive.
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.
Ceiling, ceiling zone, floor and decompression range When in decompression, it is important that you understand the meaning of ceiling, floor, and decompression range. • The ceiling is the shallowest depth to which you should ascend when in decompression. At this depth, or below, you must perform all stops. • The ceiling zone is the optimum decompression stop zone. It is the zone between the minimum ceiling and 1.4m/6 ft below the minimum ceiling.
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.
Figure 6.9. Decompression dive, below floor. Upward pointing arrow, blinking ASC TIME label and an audible alarm tell you to ascend. Minimum total ascent time including safety stop is 7 minutes. Ceiling is at 3 m/10 ft. 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.
Figure 6.10. Decompression dive, above the floor. The upward pointing arrow has disappeared and the ASC TIME label has stopped blinking, which means that you are in the decompression range. Decompression will now begin, but is very slow. Therefore, you should continue your ascent. Display at the ceiling zone When you reach the ceiling zone, the display will show you two arrows pointing at each other (the “hour glass” icon). Below is an example of a decompression dive at the ceiling zone.
Figure 6.11. Decompression dive, at ceiling zone. Two arrows point at each other (“hour glass”). You are in the optimum ceiling zone at 3.5 m/11 ft and your minimum ascent time is 5 minutes. Pressing TIME button activates alternative display. During the decompression stop, ASC TIME will count down towards zero. When the ceiling moves upwards, you can ascend to the new ceiling.
Figure 6.12. Decompression dive, above ceiling. Note a downward pointing arrow, an Er warning and an audible alarm. You should immediately (within 3 minutes) descend 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.
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%.
6.2.2. Oxygen displays 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 PO2 values.
In the Dive modes, the oxygen percentage labeled with O2% and the current oxygen toxicity exposure shown with an Oxygen Limit Fraction (OLF) bar graph are shown (Fig. 3.22. and Fig. 3.23.). The O2% is shown until the remaining air time is less than 30 minutes. After this, the remaining air time is displayed in its place. During a dive, the oxygen partial pressure, labeled with PO2, is also shown instead of the maximum depth in the upper right display, if the partial pressure is greater than 1.
• • maximum depth (during decompression stop dive) Oxygen percentage when remaining air time is less than 30 min Figure 6.15. Alternative display. Pressing TIME button displays current time, maximum depth, temperature, CBT and O2%, if Air Time is less than 30 minutes. After five seconds, the display will automatically revert to the original display. 6.2.3.
The Oxygen Limit Fraction (OLF) has 11 segments, each representing 10%.The Oxygen Limit Fraction (OLF%) displays only the value of the higher of the two calculations. The oxygen toxicity calculations are based on the factors listed in Section 10.3. Oxygen exposure . When the OTU value meets and exceeds the CNS value then in addition to displaying its percentage the lowest segment blinks to indicate that the value shown relates to OTU. Figure 6.16.
6.3. Diving in the GAUGE mode If set to Gauge mode, the dive computer can be used for diving with technical diving mixed gases. If you are trained for technical diving and you plan to use Gauge mode on a regular basis, it may be preferable to set the instrument permanently to its Gauge mode. If set to Gauge mode, the text GAUGE is shown after activation.
NOTE 76 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 Once back at the surface, Suunto Cobra continues to provide post-dive safety information and alarms. Calculations to enable repetitive dive planning also help to maximize diver safety. Table 7.1. Alarms Symbol on display Indication Diver Attention Symbol - Extend Surface Interval Violated Decompression Ceiling or Too Long Bottom Time Do Not Fly Symbol 7.1. Surface interval An ascent to any depth shallower than 1.
Figure 7.1. Surface display. You have surfaced from a 18 minute dive, which maximum depth was 20.0 m/66 ft. The present depth is 0.0 m/0 ft. The Airplane symbol indicates that you should not fly and diver attention symbol indicates that you should prolong your surface interval time.
Figure 7.2. Surface interval, the surface time and no-flying time displays: Pressing the TIME button once the surface time display is shown and by pressing the TIME button twice the no-flying time display is shown, indicated by the airplane symbol.
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.
• • • 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.
Figure 7.3. Memory options [3 MEMORY]. 7.4.1. Logbook and Dive Profile Memory [1 LOGBOOK]) The Suunto Cobra has a very sophisticated, high capacity Logbook and Profile Memory. The data is recorded in the profile memory based on the selected sample rate. Dives shorter than the recording interval are not registered. To enter the Logbook Memory Mode, select MODE- 1 MEMORY- 1 LOGBOOK. For each dive there are four pages of logbook dive information.
When Select is displayed next to the mode button the scroll buttons will scroll through the four pages of the selected dive. The END text is displayed between the oldest and most recent dive Note that chronological sequence in the logbook is determined by the date, not by the dive number. The END text is displayed between the oldest and most recent dive. The following information will be shown on three pages: Figure 7.4. Logbook, end of the memory.
Figure 7.5. Logbook, page I. Scroll different pages of specific dive. Page II • maximum depth NOTE • • • • • • • • • 84 Due to lower resolution, the reading may differ from the maximum depth reading of the Dive History up to 0.
• • • downward pointing arrow, if the ceiling was violated oxygen percentage (only in Nitrox mode) maximum OLF during the dive (only in Nitrox mode) Figure 7.6. Logbook, page II. Main dive related data. Page III • dive number in the dive series • average depth • surface interval time before the dive • ΔP describing Cylinder pressure drop during the dive.
Figure 7.7. Logbook, page III. Surface interval time, average depth and consumed air indicated by ΔP.
Figure 7.8. Logbook, page IV. Profile of a specific dive. Press the SMART (Select) button once to change the scroll buttons to scroll the different dives forward and backward. Press the SMART (>Select) button again to change function of the scroll buttons back to scroll the different pages of the selected dive. When searching the dives, only the page 1 is shown. The END text is displayed between the oldest and the most recent dive. NOTE The memory will retain approximately the last 36 hours of dive time.
Dive Profile memory [PROF] The scrolling of the profile will start automatically when the Logbook page IV (PROF) is entered. With the default setting, the dive profile is recorded and displayed in 20second increments with each display being shown for about three seconds. The depths shown are the maximum values of each interval. Pressing any button stops the scrolling of the profile. 7.4.2. Dive history Memory [2 HISTORY] The dive history is a summary of all the dives recorded by the dive computer.
Figure 7.10. Dive History information. 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 Dive Manager software.
7.4.3. Data Transfer and PC-Interface [3 TR-PC] The Suunto DM4 with Movescount (DM4) is an optional software that greatly enhances the functionality of your Suunto Cobra. 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 Cobra. 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.
• cylinder pressure at the beginning and at the end of the dive (i.e. pressure drop ΔP during dive) • surface air consumption • Altitude and Personal adjustment settings By using the DM4, you are able to enter setup options such as: • input a personal, 30-character field into the Suunto instrument.
Download and install the Suunto DM4 with Movescount software from the Movescount.com website if you do not already have the DM4 installed on your laptop To transfer data: 1. Connect your dive computer to your laptop. 2. Download your dives to the DM4 on your laptop. 3. Follow the instructions on the DM4 on how to transfer your dives to your Movescount.com account. 3. 7.6.
Figure 7.11. Dive Simulation options [2 SIMUL] In Simulation Mode, time moves four times faster than real time (when diving), for example, 15 s = 1 min. 7.6.1. Dive Simulator [1 SIMDIVE] The Dive Simulator mode is an excellent tool for becoming familiar with the dive computer and planning your dives. Suunto recommends using the dive simulator to run through different dive scenarios.
Figure 7.12. Dive Simulator mode [1 SIMDIVE]. Descend by pressing the arrow down (TIME) button and ascend by pressing the arrow up (PLAN) button. 7.6.2. Dive Planning Simulator [2 SIMPLAN] The Dive Planning Simulator mode shows you the present no-decompression limits. In this mode, you are also able to add the desired surface interval increment to present surface interval time, which allows you to plan your dives in advance. This mode is also used to add the desired surface intervals for dive simulations.
Figure 7.13. Dive Planning Simulator mode [2 SIMPLAN]. Add desired surface interval increment (to present shown surface interval) by pressing TIME and PLAN buttons. This display is only shown for repetitive dives. NOTE This display is only shown for repetitive dives. NOTE The Dive Planning Simulator mode is disabled in Gauge mode and in Error mode.
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. WARNING • • 96 The built-in depth sensor is a sophisticated precision component. Keep the area around the depth sensor clear from dirt, sand, dust or other substances.
• • • • • • • • 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.
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 for possible moisture or water. DO NOT use the dive computer if you detect any moisture or water inside. Contact an authorized Suunto dealer for battery replacement or other service. CAUTION! • Do not use compressed air to blow water off the unit.
9. BATTERY REPLACEMENT NOTE It is advisable to contact an authorized Suunto representative for battery replacement. It is imperative that the change is made in a proper manner to avoid any leakage of water into the battery compartment or computer. CAUTION 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.
9.3. Replacing the battery The battery and the buzzer are located in the back of the instrument in a separate compartment. To change the battery: 1. Unscrew the four screws at the back of the elastomer console and remove the back cover of the console. 2. Thoroughly rinse and dry the computer. 3. 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.
10. Check that the battery compartment, battery holder and lid are clean. Clean with soft cloth if necessary. 11. Check the polarity of the battery: the “-” mark should point toward the bottom of the compartment and the “+” mark upwards. Gently insert the new battery in the battery compartment. 12. Reinstall the battery retainer in its correct position. 13. Check that the new lubricated O-ring is in good condition. Put it in the right position on the battery compartment lid.
9.4. DISPLAY SHIELD REPLACEMENT Unscrew the four screws at the back of the console and remove the back cover. Remove the computer and the display shield. Install new display shield and reinstall computer and console back. 9.5. COMPASS ATTACHMENT Unscrew the four screws at the back of the console and remove the back cover. Replace the console end part with compass. Reassemble console. Figure 9.1. Opening of the securing ring.
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: 80 m/262 ft (complying with EN 13319) • Accuracy: ± 1% of full scale or better from 0 to 80 m/262 ft at 20°C/68°F (complying with EN 13319) • Depth display range: 0 to 150 m/492 ft • Resolution: 0.
• 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: -9 to +50°C/-9 to +122°F • Accuracy: ± 2°C/± 3.6°F within 20 minutes of temperature change Calendar clock: • Accuracy: ± 25 s/month (at 20°C/68°F) • 12/24 h display Displays only in NITROX mode: • Oxygen %: 21–50 • Oxygen partial pressure display: 1.2–1.6 bar.
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.
• • 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 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. 10.2.
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.
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 (mins) for various depths (m) for the first dive of a series Depth (m) 36 39 42 45 Personal Mode / Altitude Mode P0/A0 10 8 6 5 P0/A1 P0/A2 P1/A0 P1/A1 P1/A2 P2/A0 P2/A1 P2/A2 6 5 4 3 4 3 3 2 9 8 6 5 5 4 4 3 3 3 3 2 9 7 5 4 5 4 3 3 3 3 2 2 Table 10.2.
No-decompression time limits (mins) for various depths (ft) for the first dive of a series Depth (ft) Personal Mode / Altitude Mode P0/A0 P0/A1 P0/A2 P1/A0 P1/A1 P1/A2 P2/A0 P2/A1 P2/A2 90 100 110 21 17 12 13 10 7 8 5 4 19 15 11 11 9 7 7 5 4 18 13 10 10 8 6 6 5 4 120 130 140 150 10 8 6 5 6 5 4 3 4 3 3 2 9 7 6 5 5 4 4 3 3 3 2 2 8 6 5 4 5 4 3 3 3 3 2 2 10.2.3. Altitude diving The atmospheric pressure is lower at high altitudes than at sea level.
Before high-altitude diving, the instrument must be set to the Altitude Adjustment mode to adjust the calculations for the new altitude. The maximum partial pressures of nitrogen allowed by the mathematical model of the dive computer are reduced according to the lower ambient pressure. As a result, the allowed no-decompression-stop limits are considerably reduced. 10.3. Oxygen exposure The oxygen exposure calculations are based on currently accepted exposure time limit tables and principles.
• • • Audible alarms are given and the actual PO2 value blinks when it exceeds the preset limit. In dive planning, the maximum depth according to the O2% and maximum PO2 selected. the blinking of the bar graph stops, when the PO2 is below 0.5 bar.
11. INTELLECTUAL PROPERTY 11.1. Trademark Suunto is a registered trademark of Suunto Oy. 11.2. Copyright © Suunto Oy 08/2011. All rights reserved. 11.3. Patent notice Patents have been issued or applied for one or several features of this product.
12. DISCLAIMERS 12.1. CE The CE mark is used to mark conformity with the European Union EMC directive 89/336/EEC. 12.2. EN 13319 EN 13319 is a European diving depth gauge standard. Suunto dive computers are designed to comply with this standard. 12.3. EN 250 / FIOH The tank pressure gauge and dive instrument parts used in measuring the tank pressure meet the requirements set in the section of the European Standard EN 250 that concern tank pressure measurements. FIOH, notified body no.
13. SUUNTO LIMITED WARRANTY Suunto warrants that during the Warranty Period Suunto or a Suunto Authorized Service Center (hereinafter Service Center) will, at its sole discretion, remedy defects in materials or workmanship free of charge either by a) repairing, or b) replacing, or c) refunding, subject to the terms and conditions of this Limited Warranty. This Limited Warranty is only valid and enforceable in the country of purchase, unless local law stipulates otherwise.
serial number has been removed, altered or made illegible in any way, as determined at the sole discretion of Suunto; 4. has been exposed to chemicals including but not limited to mosquito repellents. Suunto does not warrant that the operation of the Product will be uninterrupted or error free, or that the Product will work in combination with any hardware or software provided by a third party. Access to Suunto warranty service Register your item at www.suunto.
14. DISPOSAL OF THE DEVICE Please dispose of the device in an appropriate way, treating it as electronic waste. Do not throw it in the garbage. If you wish, you may return the device to your nearest Suunto representative.
GLOSSARY Air time The amount of dive time remaining, based on a calculation of cylinder pressure and ambient pressure and present air consumption. Altitude dive A dive made at an elevation greater than 300 m/1000 ft above sea level. Ascent rate The speed at which the diver ascends toward the surface. ASC RATE Abbreviation for ascent rate. Ascent time The minimum amount of time needed to reach the surface on a decompression stop dive. ASC TIME Abbreviation for ascent time.
Decompression Time spent at a decompression stop, or range, before surfacing, to allow absorbed nitrogen to escape naturally from tissues Decompression range On a decompression stop dive, the depth range between the floor and the ceiling within which a diver must stop for some time during ascent.
Half time After a change in ambient pressure, the amount of time required for the partial pressure of nitrogen in a theoretical compartment to go half way from its previous value to saturation at the new ambient pressure. HP Abbreviation for high pressure (= cylinder pressure). Multi level dive A single or repetitive dive that includes time spent at various depths and whose no decompression limits are therefore not determined solely by the maximum depth attained.
O2% Oxygen percentage or oxygen fraction in the breathing gas. Standard air has 21% oxygen. Oxygen partial pressure Limits the maximum depth to which the nitrox mixture can be safely used. The maximum partial pressure limit for enriched air diving is 1.4 bar. The contingency partial pressure limit is 1.6 bar. Dives beyond this limit risk immediate oxygen toxicity. PO2 Abbreviation for oxygen partial pressure. RGBM Abbreviation for Reduced Gradient Bubble Model.
TIME-KEEPING AND STAND-BY MODE SURFACE MODE ON DIVING MODE DIVE MODE 1.
SUUNTO HELP DESK Global USA (toll free) Canada (toll free) +358 2 284 1160 +1-800-543-9124 +1-800-267-7506 www.suunto.com Copyright © Suunto Oy 02/2004, 09/2006, 09/2011. Suunto is a registered trademark of Suunto Oy. All Rights reserved.
