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Suunto D4 User Manual

Suunto d4 divers watch user's guide.
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  • Page 2: Table Of Contents

    1. WELCOME TO THE WORLD OF SUUNTO DIVING INSTRUMENTS ... 7 2. WARNINGS, CAUTIONS, AND NOTES ... 9 3. SUUNTO D4 AT A GLANCE ... 15 3.1. Navigating in the menus ... 15 3.2. Button symbols and functions ... 16 4.
  • Page 3 5.8. DIVE mode settings ... 33 5.8.1. Setting the depth alarm ... 35 5.8.2. Setting the depth notify alarm (FREE mode) ... 36 5.8.3. Setting the dive-time alarm ... 36 5.8.4. Setting the nitrox values ... 37 5.8.5. Setting the personal/altitude adjustments ... 37 5.8.6.
  • Page 4 7.5.2. Dive logbook (MEMLogbook) ... 71 7.5.3. Dive history (MEMHistory) ... 73 7.6. Suunto Dive Manager (SDM) ... 74 7.7. and Suunto Diving World at ... 76 8. CARE AND MAINTENANCE OF MY SUUNTO DIVING COMPUTER ... 77...
  • Page 5 11.3. Patent notice ... 93 12. DISCLAIMERS ... 94 12.1. User’s responsibility ... 94 12.2. CE ... 94 13. SUUNTO LIMITED WARRANTY for Suunto diving computers and Suunto Diving computer accessories ... 95 14. DISPOSAL OF THE DEVICE ... 101 GLOSSARY ... 102...
  • Page 6: Welcome To The World Of Suunto Diving Instruments

    1. WELCOME TO THE WORLD OF SUUNTO DIVING INSTRU- MENTS Suunto D4 was designed to help you get the most out of your diving. Suunto D4 simplifies your diving experience because all the information you need re- lating to depth, time and decompression status is available on one easy-to-read screen.
  • Page 7 To get the most out of your Suunto D4 please read this instruction manual carefully and make sure you understand the use, displays, and limitations of the instrument before using it. To make life easier, we've included a glossary of dive-specific termin-...
  • Page 8: Warnings, Cautions, And Notes

    Before you go on to read the manual itself, it is extremely important that you read the following warnings. These warnings are intended to maximize your safety while using Suunto D4 and must not be ignored. READ THIS MANUAL! Carefully read this manual in its entirety,...
  • Page 9 (DCI). Therefore, Suunto strongly recommends that the device is not used for any commercial or professional diving activities. ONLY DIVERS TRAINED IN THE PROPER USE OF SCUBA...
  • Page 11 YOU ARE ADVISED TO AVOID FLYING ANY TIME THE COM- WARNING PUTER COUNTS DOWN THE NO-FLY TIME. ALWAYS ACTIV- ATE 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) in Section 7.4.
  • Page 12 THE DIVE COMPUTER WILL NOT ACCEPT FRACTIONAL WARNING 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 decompres- sion calculations.
  • Page 13 This device contains a Lithium cell battery. To reduce the risk of WARNING fire or burns, do not disassemble, crush, puncture, short external contacts, or dispose of in fire or water. Replace only with manu- facturer-specified batteries. Recycle or dispose of used batteries properly.
  • Page 14: Suunto D4 At A Glance

    Time 3.1. Navigating in the menus Suunto D4 has three main operating modes - TIME mode (TIME), DIVE mode (DIVE), and MEMORY mode (MEM). To toggle between the main modes, press the MODE button. To select a submode in DIVE and MEM modes, press the UP/DOWN buttons.
  • Page 15: Button Symbols And Functions

    3.2. Button symbols and functions The table below explains the main functions of the dive computer's buttons. The buttons and their use will be explained in more detail in the relevant sections of the manual.
  • Page 16 Table 3.1. Button symbols and functions Symbol Button MODE MODE SELECT DOWN Press Main functions Switch between main modes Short Switch from submode to main mode Activate backlight in DIVE mode Long Activate backlight in other modes Select a submode Short Select and accept settings Displays Day History in FREE mode (free dive mode)
  • Page 17 Symbol Button Press DOWN Long Main functions Enter Setting mode...
  • Page 18: Getting Started With Your Suunto D4

    BEFORE getting into the water. 4.1. TIME mode settings The first thing you'll want to do with your Suunto D4, is to set the alarm, time, dual time, date, units, backlight, and tones. In this section, we look at how to do this.
  • Page 19: Setting The Alarm

    The display is illuminated by holding down the MODE button for NOTE more than 5 seconds. Now that you know how to toggle between the shortcuts, you can start to set them. The following figure shows how to enter the TIME SETTINGS menu. 4.1.1.
  • Page 20: Setting The Time

    ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. 4.1.2. Setting the time In the TIME SETTING mode, you are able to set the hour, minute, and second, as well as choose between 12 and 24 hour display. ADJUST WITH UP AND DOWN BUTTONS.
  • Page 21: Setting The Date

    4.1.4. Setting the date Use the DATE SETTING mode to set the year, month, and day. The day of the week is automatically calculated in accordance with the date. 4.1.5. Setting the units In the UNITS SETTING mode you can choose to have the units displayed in either the metric or imperial system - meters/feet, Celsius/Fahrenheit etc.
  • Page 22: Setting The Backlight

    4.1.6. Setting the backlight Use the BACKLIGHT SETTING mode to turn the backlight on or off and to define how long it stays on for (5, 10, 20, 30, or 60 seconds). When the backlight is turned off, it does not illuminate when an alarm sounds. 4.1.7.
  • Page 23: Stopwatch

    When the tones are off, there are no audible alarms. NOTE 4.2. Stopwatch The Suunto D4’s stopwatch measures elapsed and split times. 4.3. AC water contacts The water and data transfer contact is located on the side of the case. When sub- merged, the water contact poles are connected by the conductivity of the water and the “AC”...
  • Page 24 Contamination or dirt on the water contact may prevent this automatic activation. It is therefore important that the water contact is kept clean. The contact can be cleaned with fresh water and a soft brush, for example a tooth brush.
  • Page 25: Before Diving

    Always remember that YOU ARE RESPONSIBLE FOR YOUR OWN SAFETY! When used properly, Suunto D4 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 decompres- sion.
  • Page 26: The Suunto Rgbm/deep Stop Algorithm

    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.
  • Page 27: Dive Computer Limitations

    Stay there for as long as your air supply will safely allow. After reaching the sur- face, do not dive for at least 24 hours. 5.3. Dive computer limitations While the dive computer's calculations are based on current decompression research and technology, it is important to realize that the computer cannot monitor the actual physiological functions of an individual diver.
  • Page 28: Free Diving

    DIVING IS NOT RECOMMENDED. You should avoid Free diving, and not exceed 5 m/16 ft, for at least two hours after scuba diving. Suunto also recommends that you receive training in Free diving WARNING techniques and physiology before conducting breath hold dives.
  • Page 29 Table 5.1. Audible and visual alarm types Alarm type Short single beep Three beeps with a three second interval and activated backlight Continuous beeps and activ- ated backlight You are able to preset alarms before the dive for maximum depth, dive time and time. See also Section 5.8.
  • Page 30 Table 5.2. Preset alarm types Alarm type Continuous beep series for 24 seconds Maximum depth blinks as long as the current depth value exceeds the preset value. Continuous beep series for 24 seconds or until any button is pressed. Dive time blinks for one minute. Continuous beep series for 24 seconds or until any button is pressed.
  • Page 31: Error Conditions

    When the backlight is turned OFF, it does not illuminate when an NOTE alarm is activated. WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE WARNING 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.
  • Page 32: Dive Mode Settings

    5.8. DIVE mode settings Suunto D4 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, FREE), so that, for example, nitrox settings are only available in the NITROX submode.
  • Page 33 Table 5.4. Setting Depth alarm Depth notify alarm Dive time alarm Surf time notify alarm Nitrox Personal/Altitude Sample rate Deep stop RGBM Units The following figure shows how to enter the DIVE mode settings menu. AIR mode NITROX mode FREE mode...
  • Page 34: Setting The Depth Alarm

    Some settings cannot be changed until 5 minutes has elapsed NOTE after the dive. 5.8.1. Setting the depth alarm You can set a depth alarm in the dive computer. ADJUST WITH UP AND DOWN BUTTONS. ACCEPT WITH SELECT BUTTON. USE UP AND DOWN BUTTONS TO TOGGLE BETWEEN DIVE SETTINGS.
  • Page 35: Setting The Depth Notify Alarm (free Mode)

    5.8.3. Setting the dive-time alarm The Suunto D4 has a dive-time alarm setting which, when activated, can be used for several purposes to add to your diving safety. With a range of 1 - 999 minutes, the alarm can be set to your NOTE planned bottom time, for example.
  • Page 36: Setting The Nitrox Values

    5.8.4. Setting the nitrox values 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. When in the NITROX setting mode, the equivalent allowed maximum depth, based on the chosen setting, will also be displayed.
  • Page 37: Setting The Surface Time Notify Alarm (free Mode)

    5.8.6. Setting the surface time notify alarm (FREE mode) You can set a surface time notify alarm to indicate the length of the surface time before a new dive. Suunto D4 starts counting the time automatically when you surface (at 0,5 m/1,6 ft).
  • Page 38: Setting The Deep Stops

    5.8.8. Setting the Deep Stops If set to ON, iterative Deep Stops will be prompted. The length of the individual Deep Stops can be set to 1 or 2 minutes. 5.8.9. Setting the RGBM values For certain divers and diving conditions, it may be desirable to set the attenuated RGBM mode.
  • Page 39: Accessing Dive Mode

    5.9.1. Accessing DIVE mode The Suunto D4 has three diving modes: AIR mode for diving with standard air only, NITROX mode for diving with oxygen enriched mixtures, and FREE mode for free diving. The OFF mode disables the DIVE mode, and allows the TIME mode to be used un- derwater.
  • Page 40 At this time, perform your pre-checks, making sure that: the instrument operates in the correct mode and provides a complete display • (AIR/NITROX/FREE mode) the battery level is ok • the altitude, personal adjustment, Safety/Deep stops, and RGBM settings are •...
  • Page 41: Battery Power Indication

    5.9.3. Battery power indication Temperature or internal oxidation of the battery affect the battery voltage. If the instru- ment is stored for a long period, or used in cold temperatures, the low battery warning may be displayed even though the battery has enough capacity. In these cases, re- enter DIVE mode to receive the battery power indication.
  • Page 42 When programming the instrument for the correct altitude, you need to select the correct Altitude Adjustment settings according to Table 5.5, Altitude Adjustment settings. The dive computer will adjust its mathematical model according to the entered altitude setting, giving shorter no-decompression times at higher altitudes (see Table 10.1, No-decompression time limits for various depths (m) and Table 10.2, No-decompression time limits for various depths (ft) in Section 10.2.
  • Page 43: Personal Adjustments

    5.9.5. Personal adjustments There are personal factors that can affect your susceptibility to DCI, which you can predict in advance, and input into the decompression model. Such factors vary between divers and also for the same diver from one day to another. The three-step Personal Adjustment setting is available if a more conservative dive plan is desired and, for very experienced divers, a two step adjustment for RGBM effect on repetitive dives is available.
  • Page 44 Several risk factors or conditions exist The Suunto D4 also allows experienced divers who are willing to accept a greater level of risk to adjust the RGBM model. The default setting is 100%, which gives full RGBM effect. Suunto strongly advises you to use full RGBM effect. Statistically, very experienced divers have less incidents with DCI.
  • Page 45: Safety Stops

    The reasons for performing a Safety Stop in- clude: reducing sub-clinical DCI, microbubble reduction, ascent control, and orientation before surfacing. The Suunto D4 displays two different types of Safety Stops: Recommended Safety Stop and Mandatory Safety Stop. 5.10.1. Recommended Safety Stops With every dive over 10 meters, there is a three minute countdown for the Recommen- ded Safety Stop, to be taken in the 6 - 3 m/10 ft - 20 ft range.
  • Page 46: Mandatory Safety Stops

    The Suunto RGBM calculation model responds to this by adding a Mandatory Safety Stop to the dive. The time of this Mandatory Safety Stop depends on the severity of the ascent rate excess.
  • Page 47 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 on. If you ascend above the Mandatory Safety Stop ceiling, a downward pointing arrow will appear and a continuous beeping starts.
  • Page 48: 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.
  • Page 49: Diving

    6. DIVING This section contains instructions on how to operate the dive computer and interpret its displays. You’ll find that this dive computer is easy to use and read. Each display shows only the data relevant to that specific diving mode. 6.1.
  • Page 50 your present depth in meters/feet • the available no-decompression time in minutes as NO DEC TIME • the ascent rate presented as a bar graph on the right side • Alternative displays, by pressing the UP/DOWN buttons, show: the elapsed dive time in minutes, shown as DIVE TIME •...
  • Page 51: Bookmark

    It is possible to record bookmarks in the profile memory during a dive. These bookmarks are displayed when scrolling the profile memory on the display. The bookmarks will also be shown as annotations in the downloadable Suunto Dive Manager PC software. The bookmark logs the depth, time and water temperature.
  • Page 52: Decompression Dives

    6.1.4. Decompression dives When your NO DEC TIME becomes zero, your dive becomes a decompression dive so you must perform one or more decompression stops on your way to the surface. The NO DEC TIME on your display will be replaced by an ASC TIME, and a CEILING notation will appear.
  • Page 53 YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN DIS- WARNING PLAYED BY THE INSTRUMENT! The ascent time will increase if you: • remain at depth • ascend slower than 10 m/33 ft per minute • make your decompression stop deeper than at the ceiling These factors will also increase the amount of air required to reach the surface.
  • Page 54 In such cases, it is more manageable to maintain an additional distance below the ceiling, to make sure that the waves do not lift you above the ceiling. Suunto re- commends that decompression takes place deeper than 4 m/13 ft, even if the indicated ceiling is shallower.
  • Page 55 Display below the floor The blinking ASC TIME and an upward pointing arrow indicate that you are below the floor. You should start your ascent immediately. The ceiling depth is shown on the left side, and the minimum total ascent time on the right side, of the center window. Below is an example of a decompression dive without Deep Stops, below the floor.
  • Page 56 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. TWO ARROWS POINT AT EACH OTHER “HOUR GLASS”...
  • Page 57: Diving In Nitrox Mode (divenitrox)

    You must not dive again for at least 48 hours. (See Section 5.7. Error conditions). 6.2. Diving in NITROX mode (DIVEnitrox) NITROX mode (DIVEnitrox) is the second dive mode available in Suunto D4 and is used when using oxygen- enriched gas mixtures.
  • Page 58: Oxygen Displays

    To set the nitrox mixes, refer to Section 5.8.4. Setting the nitrox values. Default nitrox settings In NITROX mode, the Suunto D4 allows you to set a nitrox mix containing 21-50% oxygen. In the NITROX mode, the default setting is standard air (21% O ).
  • Page 59: Maximum Depth

    MAXIMUM OPERATIONAL DEPTH BASED ON SET O If set to NITROX mode, the Suunto D4 will additionally show on the alternative display: • the oxygen percentage, labeled O the set oxygen partial pressure limit, labeled PO • • the current oxygen toxicity exposure, labeled OLF maximum depth •...
  • Page 60: Oxygen Limit Fraction (olf)

    6.2.3. Oxygen limit fraction (OLF) If set to NITROX mode, in addition to tracking the diver's exposure to nitrogen, the instrument tracks the exposure to oxygen. These calculations are treated as entirely separate functions. 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).
  • Page 61: Day History

    The free dive ends as soon as you surface (at 0,5 m/ 1,6 ft). The FREE mode does not provide decompression information. NOTE There is no ascent rate monitoring in the FREE mode. NOTE 6.3.1. Day History The Day History shows the free dive history of your latest diving day. In the Surface mode you can enter the Day History by pressing the SELECT button.
  • Page 62 The Day History shows the average depth of all dives, the deepest depth of the day as well as the time, the longest dive, and the cumulative dive time in hours and minutes, as well as the number of dives made during the day. The first dive of the next day will reset the Day History and start NOTE a new one.
  • Page 63: Free Dive Time Limit

    6.3.2. Free dive time limit The FREE mode has a time limit of 10 minutes. After 10 minutes, Suunto D4 will automatically change from free dive to scuba bottom timer. After the dive, the no-fly time will countdown from 48 hours. Also, you will not be able to dive in AIR or NITROX modes until the no-fly time has counted down to zero.
  • Page 64: After Diving

    7. AFTER DIVING Once back at the surface, Suunto D4 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 7.1. Surface interval An ascent to any depth shallower than 1.2 m/4 ft (0,5 m/1,6 ft in FREE mode) will...
  • Page 65: Dive Numbering

    Or, in the alternative displays, the following information will be shown: maximum depth of last dive in meters/feet • • dive time of last dive in minutes, shown as DIVE TIME the current time, shown as TIME • • the current temperature in °C/°F If set to NITROX mode, the following information will also be shown: the oxygen percentage labeled O •...
  • Page 66: Free Dive

    7.3. Repetitive dive planning The Suunto D4 includes a dive planner that allows you to review the no-decompression limits on a subsequent dive, taking the residual nitrogen loading of previous dives into consideration.
  • Page 67: Memory Mode

    Following any dive that required a decompression stop, flying should be delayed • for at least 24 hours, and if possible, for 48 hours Suunto recommends that flying is avoided until all the DAN and UHMS guidelines, • as well as the dive computer’s no-fly conditions, are satisfied 7.5.
  • Page 68: Dive Planning Mode (memplan)

    The dive time and date are registered in the Logbook memory. Always check before diving that the time and date are correctly set, especially after traveling between differ- ent time zones. 7.5.1. Dive Planning mode (MEMPlan) The Dive Planning mode displays no-decompression times for a new dive, taking into account the effects of previous dives.
  • Page 70: Dive Logbook (memlogbook)

    Dive numbering ). 7.5.2. Dive logbook (MEMLogbook) The Suunto D4 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...
  • Page 71 Maximum depth • date of dive • type of dive (AIR, NITROX, FREE, bottom timer (G)) • dive start time • dive number • • oxygen percentage total dive time (in minutes in AIR and NITROX modes, and minutes and seconds •...
  • Page 72: Dive History (memhistory)

    You can reset the maximum depth of scuba dives to 0.0 m/0 ft NOTE with the PC-Interface unit and the downloadable Suunto Dive Manager software. Free Dive History The Free Dive History shows the deepest and the longest dives of all free dives, and the cumulative dive time in hours and minutes, as well as the total number of dives.
  • Page 73: Suunto Dive Manager (sdm)

    With the SDM software, you can download dive data from your dive computer to your PC. You can then view and organize all the data recorded with your Suunto D4. You can also plan dives, print copies of your dive profiles and upload your dive logs to share with your friends at
  • Page 74 • personal information (30 characters) • Using SDM, you are able to enter setup options such as: input a personal, 30-character field into the Suunto D4 • reset the Scuba History’s maximum depth to zero • reset all Free Dive History •...
  • Page 75: And Suunto Diving World At

    7.7. and Suunto Diving World at When you have dived and transferred your dive data to your Suunto Dive Manager, you can share your best experiences with other diving enthusiasts at It's a free and open Internet community where you can compare your underwater ex- periences with other Suunto users and learn from each other.
  • Page 76: Care And Maintenance Of My Suunto Diving Computer

    8. CARE AND MAINTENANCE OF MY SUUNTO DIVING COM- PUTER 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.
  • Page 77 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.
  • Page 78 Original battery replacement and strap kits must be used. Batteries can be changed by the user in all diving computers except Stinger, D4, D6 and D9. Instructions for changing batteries and straps can be found in the user manuals or at...
  • Page 79 Original Suunto accessories are only distributed through Suunto`s worldwide network of authorized Suunto distributors and retailers. Original Suunto accessories are tested to be compatible with Suunto products and can be used safely. Damage caused by non-original accessories will not be covered NOTE by warranty.
  • Page 80 As far as the national laws permit, repairing the product does not extend or otherwise affect the warranty period. However, part(s) repaired or replacement product(s) provided during the warranty period will be warranted for the remainder of the original warranty period or for three (3) months from the date of repair or replacement, whichever is longer.
  • Page 81: Battery Replacement

    9. BATTERY REPLACEMENT It is advisable to contact an authorized Suunto representative for NOTE 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.
  • Page 82: Technical Data

    10. TECHNICAL DATA 10.1. Technical specifications Dimensions and weight: • Diameter: 50.0 mm/1.97 in • Thickness: 16.0 mm/0.61 in • Weight: 85g/3.0 oz Depth gauge: • Temperature compensated pressure sensor • Salt water calibrated, in fresh water the readings are about 3% smaller (calibrated in compliance with EN 13319) •...
  • Page 83 Displays only in NITROX mode: • Oxygen %: 21 - 50 • Oxygen partial pressure display: 0.5 - 1.6 bar • Oxygen Limit Fraction: 1 - 200% with 1% resolution Logbook/dive profile memory: • Air and Nitrox dive recording rate: default 20 seconds, adjustable 1, 10, 20, 30, •...
  • Page 84 Tissue calculation model: • Suunto Deep Stop RGBM algorithm (developed by Suunto and Bruce R. Wienke, BSc, MSc, PhD) • 9 tissue compartments • Tissue compartment halftimes: 2.5, 5, 10, 20, 40, 80, 120, 240 and 480 minutes (on gassing). The off gassing halftimes are slowed down •...
  • Page 85: Rgbm

    It was developed in co-operation between Suunto and Bruce R. Wienke BSc, MSc, PhD. It is based on both laboratory experiments and diving data, including data from DAN.
  • Page 86: Suunto Rgbm Adaptive Decompression

    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.
  • Page 87: No-decompression Limits

    10.2.2. No-decompression limits 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.
  • Page 88 Table 10.1. No-decompression time limits for various depths (m) No-decompression time limits (mins) for various depths (m) Depth P0/A0 P0/A1 for the first dive of a series Personal Mode / Altitude Mode P0/A2 P1/A0 P1/A1 P1/A2 P2/A0 P2/A1 P2/A2...
  • Page 89 Table 10.2. No-decompression time limits for various depths (ft) No-decompression time limits (mins) for various depths (ft) Depth (ft) P0/A0 P0/A1 for the first dive of a series Personal Mode / Altitude Mode P0/A2 P1/A0 P1/A1 P1/A2 P2/A0 P2/A1 P2/A2...
  • Page 90: Altitude Diving

    10.2.3. Altitude diving The atmospheric pressure is lower at high altitudes than at sea level. After traveling to a higher altitude, you will have additional nitrogen in your body, compared to the equilibrium situation at the original altitude. This "additional" nitrogen is released gradually over time and equilibrium is restored.
  • Page 91 Oxygen related information displayed by the dive computer is also designed to ensure that all warnings and displays occur at the appropriate phases of a dive. For example, the following information will be shown before and during a dive when the computer is set in NITROX mode: the selected O % on the alternative display...
  • Page 92: Intellectual Property

    Suunto, D4, Consumed Bottom Time (CBT), Oxygen Limit Fraction (OLF), Suunto Reduced Gradient Bubble Model (RGBM), and Continuous Decompression and their logos are all registered or unregistered trademarks of Suunto. All rights are reserved. 11.3. Patent notice This product is protected by the following patents and patent applications: US 5,845,235...
  • Page 93: Disclaimers

    12. DISCLAIMERS 12.1. User’s responsibility This instrument is intended for recreational use only. Suunto D4 must not be used for obtaining measurements that require professional or industrial precision. 12.2. CE The CE mark is used to mark conformity with the European Union EMC directive 89/336/EEC FIOH, Topeliuksenkatu 41 a A, FI-00250 Helsinki, Finland, notified body no.0430, has...
  • Page 94: Suunto Limited Warranty For Suunto Diving Computers And Suunto Diving Computer Accessories

    This Limited Warranty is only valid and enforceable in the country in which you pur- chased the Product, provided that Suunto has intended the Product for sale in that country. If, however, you purchased the Product in a member state of the European...
  • Page 95 Product, including use that is contrary to the instructions provided by Suunto (e.g. as set out in the Product's user guide and/instruction manual), and/or e) other acts beyond the...
  • Page 96 Product's serial number has been removed, erased, defaced, altered or made illegible in any way - and this shall be determined at the sole discretion of Suunto; the Product has been exposed to influence from chemical products including (but not limited to) mosquito repellents.
  • Page 97 Product repaired or replaced at no charge and returned in a reasonable amount of time. This shall be determined at the sole discretion of Suunto or a Suunto Authorized Service Center. If the Product is found not to be covered by the terms and conditions of this Limited Warranty, Suunto or a Suunto Authorized Service Centre reserve the right to charge a handling fee.
  • Page 98 When the Product or a part is replaced, any replaced item becomes the property of Suunto. If a refund is given, the Product for which the refund is given must be returned to a Suunto Authorized Service Centre as it becomes the property of Suunto and/or Suunto Authorized Service Centre.
  • Page 100: Disposal Of The Device

    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 repres- entative.
  • Page 101: Glossary

    GLOSSARY Altitude dive Ascent rate ASC RATE Ascent time ASC TIME Ceiling Central nervous system toxicity CNS% Compartment Decompression Decompression range A dive made at an elevation greater than 300 m/1000 ft above sea level. The speed at which the diver ascends toward the surface. Abbreviation for ascent rate.
  • Page 102 Decompression illness Dive series Dive time Enriched air nitrox Equivalent air depth Floor Half time Multi level dive Any of a variety of maladies resulting either directly or indirectly from the formation of nitrogen bubbles in tissues or body fluids, as a result of inad- equately controlled decompression.
  • Page 103 Abbreviation for oxygen tolerance unit. Used to measure the whole-body-toxicity. A term used by Suunto for the values displayed in the oxygen toxicity bar graph. The value is either the CNS% or the OTU%. Oxygen percentage or oxygen fraction in the breathing gas. Standard air has 21% oxygen.
  • Page 104 Reduced Gradient Bubble Model Repetitive dive Residual nitrogen SURF TIME Surface interval time Tissue group Whole-body toxicity Modern algorithm for tracking both dissolved and free gas in divers. Any dive whose decompression time limits are affected by residual nitro- gen absorbed during previous dives. The amount of excess nitrogen remaining in a diver after one or more dives.

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