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Suunto Gekko Manual

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Arrows: - Decompression Stop at the Ceiling Depth - Mandatory Safety Stop Zone - Ascent Recommended - Must Descend Safety Stop Warning Safety Stop Indicator Fast Ascent Warning (SLOW)
Maximum Depth Ceiling Depth on Decompression Mandatory Safety Stop Depth Average Depth on Logbook Oxygen Partial Pressure AM/PM Indicator
Present Depth Dive Counter

Logbook Symbol


Dive Attention Symbol

Bar Graph: - Mode Indicator - Consumed Botton Time - Oxygen Limit Fraction
Bar Graph: - Ascent Rate Indicator - Battery Power Indicator - Logbook Page Indicator


Quick reference guide Gekko

Do Not Fly Icon

Current Time Display Surface Interval Time No Flying Time No-Decompression Time Total Ascent Time Safety Stop Time The Smart Button: - Activation - Mode Operations Indicators for the Smart Button
Oxygen Percentage in Nitrox Mode



High Altitude Mode

Personal Adjustment Mode


Low Battery Warning Dive Time Time Month,Day DiveTime/Depth Alarm On Indicator


Temperature Week Day Mode Text
Indicators for the Scroll Buttons
Dive Planning Button Scroll Button (increase value, ascend)
Time (alternative display) Button Scroll Button (decrease value, descend)
DEFINITION OF WARNINGS, CAUTIONS AND NOTES Throughout this manual, special references are made when deemed important. Three classications are used to separate these references by their order of importance. WARNING is used in connection with a procedure or situation that may result in serious injury or death. CAUTION is used in connection with a procedure or situation that will result in damage to the product. NOTE is used to emphasize important information.
COPYRIGHT, TRADEMARK AND PATENT NOTICE This instruction manual is copyrighted and all rights are reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated, or reduced to any media without prior written consent from SUUNTO. SUUNTO, GEKKO, Consumed Bottom Time (CBT), Oxygen Limit Fraction (OLF), SUUNTO Reduced Gradient Bubble Model (RGBM), Continuous Decompression and their logos are all registered or unregistered trademarks of SUUNTO. All rights are reserved. CE The CE mark is used to mark conformity with the European Union EMC directive 89/336/EEC. The instruments must be serviced by an authorized dealer every second year or after 200 dives (whichever comes rst). EN 13319 EN 13319 Diving accessories - Depth gauges and combined depth and time measuring devices - Functional and safety requirements, test methods is a European diving depth gauge standard. The GEKKO is designed to comply with this standard.
ISO 9001 SUUNTO Oys Quality Assurance System is certied by Det Norske Veritas to be according to the ISO 9001 in all SUUNTO Oys operations (Quality Certicate No. 96-HEL-AQ-220). SUUNTO Oy does not assume any responsibility for losses or claims by third parties, which may arise through the use of this device. Due to continuous product development, the GEKKO is subject to change without notice.


READ THIS MANUAL! Carefully read this instruction manual in its entirety paying close attention to all warnings listed below, including section 1.1. Safety Precautions. Make sure that you fully understand the use, displays and limitations of the dive computer because any confusion resulting from neglecting to follow this instruction manual or from improper use of this device may cause a diver to commit errors that may lead to serious injury or death.

3.1.3. Dive Planning [PLAN]
To enter Planning Mode, press the PLAN button at any time during Surface Mode. After showing the text PLAN (Fig. 3.5.), the display will show the no-decompression limit for the depth of 9 m [30 ft]. By pressing the down arrow (t) (TIME) button, the dive computer will calculate and show the next deeper no-decompression limits in 3 m [10 ft] increments ending at 45 m [150 ft]. By pressing the up arrow (s) (PLAN) button, the next shallower depth will be shown again. The Planning Mode is canceled by pressing the SMART (QUIT) button. NOTE! The Planning mode is disabled in Error mode (see section 3.8. Error Conditions). Higher Altitude and conservative Personal Adjustment Modes will shorten the no-decompression time limits. These limits at different Altitude and Personal Adjustment Mode selections are shown in Table 6.1 and 6.2 in section 6.1. Operating Principles. The Planning mode also accounts for the following information from previous dives: any calculated residual nitrogen all dive history for the past four days oxygen toxicity (Nitrox mode)
The no-decompression times given for different depths will therefore be shorter than before your rst fresh dive. DIVE NUMBERING SHOWN DURING DIVE PLANNING Dives belong to the same repetitive dive series if the instrument was still counting down the no-y 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 3.5.2. Dive Numbering).
3.1.4. User Denable Functions and Alarms
The GEKKO has several user denable functions and depth and time related alarms that you can set according to your personal preference. The dive computer model (Air/Nitrox) can be set in the MODE- SET- MODEL submode. The dive alarms can be set under MODE- SET- SET ALARMS, the time and date settings in MODE-SET-SET TIME, and the units (metric/imperial) as well as personal adjustments in the MODE- SET- SET ADJUSTMETS submode. Setting of the user denable functions and alarms are explained in detail in section 4.2. Set Modes.


Safety stops are widely considered good diving practice and are an integral part of most dive tables. Reasons to perform a safety stop include a reduction in sub clinical DCI, microbubble reduction, ascent control, and orientation before surfacing. The GEKKO displays two different types of safety stops: Recommended Safety Stop and Mandatory Safety Stop. The Safety Stops are indicated by: STOP label, when in the depth range 3 m - 6 m [10 ft - 20 ft] = Recommended Safety Stop Countdown STOP+ CEILING label, when in the depth range 3 m - 6 m [10 ft - 20 ft] = Mandatory Safety Stop Time display STOP label, when deeper than 6 m = Mandatory Safety Stop scheduled

Fig. 3.12. Ascent Rate Indicator. Blinking depth reading, SLOW and four segments are shown together with an audible alarm: ascent rate is more than 10 m/min [33 ft/min]. This is a caution to slow down! STOP sign means that you are advised to make a Mandatory Safety Stop when you reach a depth of 6 m [20 ft].
Fig. 3.13. A Mandatory Safety Stop. You are advised to make a Mandatory Safety Stop in the depth zone between 6 m and 3 m [20 ft and 10 ft]. Pressing TIME button shows alternative display.
Rather than requiring you to make stops at xed depths, the dive computer lets you to decompress within a range of depths (Continuous Decompression). The ascent time (ASC TIME) is the minimum amount of time needed to reach the surface in a decompression dive. It includes: the time needed to ascend to the ceiling at an ascent rate of 10 m/min [33 ft/min] plus the time needed at the ceiling. The ceiling is the shallowest depth to which you should ascend plus the time needed at the Mandatory Safety Stop (if any) plus the 3 minute Recommended Safety Stop plus the time needed to reach the surface after the ceiling and safety stops have been completed.
Fig. 3.14. Violated Mandatory Safety Stop. Downward pointing arrow and an audible alarm indicate you should descend to ceiling zone.


Fig. 3.15. Decompression dive, below oor. 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].
YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN DISPLAYED BY THE INSTRUMENT! The ascent time will increase if you: or remain at depth ascend slower than 10 m/min [33 ft/min]
Fig. 3.16. Decompression dive, above oor. Upward pointing arrow has disappeared and ASC TIME label has stopped blinking, which means that you are in the decompression range.
make your decompression stop deeper than at the ceiling. These factors will also increase the amount of air required to reach the surface.
CEILING, CEILING ZONE, FLOOR AND DECOMPRESSION RANGE When in decompression, it is important that you understand the meaning of ceiling, oor, and decompression range (Fig. 3.19.): The ceiling is the shallowest depth to which you should ascend when in decompression. At this depth, or below, you must perform all stops. The ceiling zone is the optimum decompression stop zone. It is the zone between the minimum ceiling and 1.8 m [6 ft] below the minimum ceiling. The oor is the deepest depth at which the decompression stop time will not increase. Decompression will start when you pass this depth during your ascent. The decompression range is the depth range between the ceiling and oor. Within this range, decompression takes place. However, it is important to remember that the decompression will be very slow at, or close to, the oor.

Fig. 3.19. Ceiling and Floor Zones. The Recommended and Manadatory Safety Stop zone lies between 6m and 3m [20 ft and 10ft].
3m / 10ft 6m / 18ft FLOOR
As a safety precaution the oxygen calculations in the computer are made with an oxygen percentage of 1% + setO2%. DEFAULT NITROX SETTINGS In the NITROX Mode, when set to standard air (21% O2), the instrument can be used as an air dive computer. It remains in this air mode until the O2% setting is adjusted to any other percentage of oxygen (22% - 50%). NOTE! The computer will automatically revert to the air (21% O2) setting when a new dive series is started, if it is not set to any other mix during the last two hours. When the oxygen percentage is set for air, the computer will retain this setting.
Fig. 3.20. Nitrox display. Maximum depth based on set O2% (21%) and PO2 (1.4 bar) is 54.1 m [177 ft].
Manually entered values for oxygen percentage are retained for about two hours after the setting if a dive series has not started. In case a dive series is started, the set value is retained until a new dive series is started or a new value is entered manually. The default setting for maximum oxygen partial pressure is 1.4 bar, however you are able to set it between the range of 1.2 - 1.6 bar.
Fig. 3.21. Surface display in the Nitrox mode

3.4.2. Oxygen Displays

If set to Nitrox mode the NITROX display, with all labeled oxygen information and the label NITROX, is shown after activation, and before the Dive Planning Mode. The Nitrox display shows (Fig. 3.20.):
Fig. 3.22. Diving in Nitrox mode. The O2% is set to 32%.
the oxygen percentage, labeled with O2%, is shown in the left side of the center window the set oxygen partial pressure limit, labeled with PO2, is shown in the upper right display the maximum allowed depth based on the set oxygen percentage and partial pressure limit the current oxygen toxicity exposure shown with an Oxygen Limit Fraction (OLF) bar graph along the left side of the display (instead of the CBT).
In Dive mode, the oxygen percentage labeled with O2% and the current oxygen toxicity exposure shown with an Oxygen Limit Fraction (OLF) bar graph are shown (Fig. 3.21. and Fig. 3.22.). 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 1.4 bar or the set value (Fig. 3.23.). By pressing the TIME button during a nitrox dive, the alternative display appears, which includes (Fig. 3.24.): current time Consumed Bottom Time maximum depth (during decompression stop dive). After ve seconds the display will automatically revert to the original display.
Fig. 3.23. Oxygen partial pressure and OLF displays. There is an audible alarm as oxygen partial pressure is greater than 1.4 bar or set value, and/or the OLF has reached 80% limit.

OXYGEN ALARMS IN NITROX MODE Three double beeps for 5 seconds occur, when: the OLF bar graph reaches 80%. The segments exceeding the 80% limit start to blink (Fig. 3.23.)
the OLF bar graph reaches 100%. The blinking of the segments exceeding 80% will stop, when the OLF is not loading anymore. At that point the PO2 is less than 0.5 bar. Continuous beeps for 3 minutes occur, when: the set oxygen partial pressure limit is exceeded. The maximum depth is replaced with a current blinking PO2 value. You should immediately ascend above the PO2 depth limit (Fig. 3.23.).
WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE MAXIMUM LIMIT IS REACHED, YOU MUST IMMEDIATELY ASCEND UNTIL THE WARNING STOPS BLINKING! Failure to take action to reduce oxygen exposure after the warning is given can rapidly increase the risk of oxygen toxicity and the risk of injury or death.
The dive computer can be adjusted both for diving at altitude and also to increase the conservatism of the mathematical nitrogen model.
3.7.1. Altitude Adjustment
When programming the instrument for the correct altitude, you need to select the correct Altitude Mode according to Table 3.4. The dive computer will adjust its mathematical model according to the entered altitude mode, giving shorter nodecompression times at higher altitudes (see Section 6.1. Operating Principles, Table 6.1. and 6.2.). The entered Altitude Adjustment Mode is indicated by mountain symbols (A0, A1 TABLE 3.4. ALTITUDE ADJUSTMENT RANGES
Altitude mode A0 A1 A2 Symbol on display Altitude range 0 - 300 m [0 - 1000 ft] 300 - 1500 m [1000 - 5000 ft] 1500 - 3000 m [5000 - 10000]
= one mountain, or A2 = two mountains). Section 4.2.4. Personal Adjustments describes how the Altitude Mode is adjusted. Traveling to a higher elevation can temporarily cause a change in the equilibrium
of dissolved nitrogen in the body. It is recommended that you acclimate to the new altitude by waiting at least three hours before making a dive.
3.7.2. Personal Adjustment
There are adverse personal factors for DCI which divers can predict in advance and input into the decompression model. Factors that may affect susceptibility to decompression illness vary between divers and also for the same diver from one day to another. The three-step Personal Adjustment Mode is available, if a more conservative dive plan is desired. 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] - the diver is below average physical tness level - diver fatigue - diver dehydration - previous history of DCI - stress - obesity The Personal Adjustment Mode is indicated by a diver symbol and plus signs (P0 = a diver, P1 = diver +, or P2 = diver ++). Section 4.2.4. Personal Adjustments describes how the Personal Mode is adjusted. This feature should be used to adjust the computer to be more conservative, according to personal preference, by entering the suitable Personal Adjustment Mode with the help of Table 3.5. In ideal conditions, retain the default setting, P0. If conditions are more difcult or other mentioned factors which tend to increase the possibility of DCI exist, select P1 or even the most conservative P2. As a result the dive computer adjusts its mathematical model according to the entered Personal Adjustment Mode, giving shorter no-decompression times (see section 6.1. Operating Principles, Table 6.1 and 6.2).

Personal mode P0 P1 P2 Symbol on display Condition Ideal condition Some mentioned factors or conditions exist Several mentioned factors or conditions exist Desired tables Default Progressively more conservative


The dive computer has warning indicators that alert the user to react to certain situations that would signicantly 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 and operate the dive computer sensibly, it is very unlikely you will ever put the instrument into the Error Mode. OMITTED DECOMPRESSION The Error Mode results from omitted decompression, i.e. when you stay above the ceiling for more than three minutes. During this three-minute period the Er warning is shown and the audible alarm beeps. After this, the dive computer will enter a permanent Error Mode. The instrument will continue to function normally if you descend below the ceiling within this three-minute period. Once in the permanent Error Mode only the ER warning is shown in the center window. The dive computer will not show times for ascent or stops. However, all the other displays will function as before to provide information for ascent. You should immediately ascend to a depth of 3 to 6 m [10 to 20 ft] and remain at this depth until air supply limitations require you to surface. After surfacing, you should not dive for a minimum of 48 hours. During the permanent Error Mode, the Er text will be displayed in the center window and the Planning Mode will be disabled.


To make yourself familiar with the menu based functions, please use your Quick Reference Guide supplied with the GEKKO together with the information in this chapter. The main menu based functions are grouped under 1) Memory and 2) Setting modes. THE use OF the menu based functions 1. Activate the menu based modes by pressing once the SMART (MODE) button in the Dive Mode (Fig. 4.1.). 2. 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 (Fig. 4.2. 4.3.). 3. Press the SMART (Select) button once to select the desired option. 4. 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. 5. Select the desired option by pressing once the SMART (Select) button. Repeat the procedure, if there are more submodes. 6. Depending on the mode, you are now able to have a look at the memories or make desired settings (use the the arrow up/down buttons). The SMART button is used to Quit or to conrm the settings (OK). If you do not press any of the buttons for 5 minutes while in a Menu based mode, the instrument beeps and returns to the timekeeping display. EXIT / QUIT! 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.

Fig. 4.1. Main menu based Mode options. [2 MODE].


Fig. 4.2. Memory option. [1 MEMORY].
Fig. 4.3. Set option. [2 SET].
THE LIST OF THE MENU BASED MODES 1. MEMORY FUNCTIONS [1 MEMORY] 1. Logbook and Dive Prole Memory [1 LOGBOOK] 2. Dive History Memory [2 HISTORY] 3. PC Settings [3 PC SET] 2. SET MODES [2 SET] 1. Air or Nitrox Oxygen settings [1 MODEL] 2. Set Alarms [2 SET ALMS] 1. Maximum depth alarm setting 2. Dive time alarm setting 3. Set time and date [3 SET TIME] 1. Time display, time, date and year settings 4. Personal Adjustments [4 SET ADJ] 1. Altitude adjustment 2. Personal adjustment 3. Dive computer units setting NOTE! The menu based modes cannot be activated until 5 minutes after the dive.
Fig. 4.4. Memory options. [3 MEMORY].
Fig. 4.5. Logbook option. [1 LOGBOOK].

page 1

The memory options (Fig. 4.4.) for this dive computer include the combined Logbook and Dive Prole Memory (Fig. 4.5. 4.11.), Dive History Memory (Fig. 4.12. 4.13.). 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 traveling between different time zones.
Fig. 4.6. Logbook, page I. Scroll different pages of specic dive.
4.1.1. Logbook and Dive Prole Memory [1 LOGBOOK]
This instrument has a very sophisticated high capacity Logbook and Prole Memory, with a data recording interval of 30 seconds. Dives shorter than the recording interval are not registered. To enter the Logbook Memory Mode select MODEMEMORY- LOGBOOK. For each dive there are four pages of logbook dive information. Use the scroll buttons to scroll the display between Logbook pages I, II, III and IV. The data of the most recent dive is shown rst. The logbook dives can be scrolled through displaying only the rst page of each dive, or scrolling through the 4 different pages of a dive. When at the rst page of a dive use the MODE button to change the scroll sequence. When the arrow icon is next to the Mode button the scroll button will scroll through the rst page only of each dive. 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. (Fig. 4.11.) Note that chronological sequence in the logbook is determined by the date, not by the dive number. The following information will be shown on four pages:

page 2

Fig. 4.7. Logbook, page II. Main dive related data.

page 3

Fig. 4.8. Logbook, page III. Surface interval time and average depth
Page I, main display (Fig. 4.6.) dive number in the dive series dive entry time and date.

page 4

Fig. 4.9. Logbook, page IV. Prole of specic dive.
Page II (Fig. 4.7.) dive number in the dive series maximum depth (NOTE! Due to lower resolution, the reading may differ from the maximum depth reading of the Dive History up to 0.3 m [1 ft].) total dive time temperature at the maximum depth Altitude Adjustment setting Personal Adjustment setting SLOW label, if the diver has violated the maximum ascent rate STOP label, if the Mandatory Safety Stop was violated ASC TIME label, if the dive was a decompression stop dive Diver attention symbol, if the symbol was displayed when dive was started downward pointing arrow, if the ceiling was violated oxygen percentage maximum OLF during the dive (only in Nitrox mode).

v v

Page III (Fig. 4.8.) dive number in the dive series average depth surface interval time before the dive
Page IV (Fig. 4.9.) dive number in the dive series the prole of the dive, automatic scrolling during which: logbook symbol blinks at the point when the user has pressed the PLAN button for Bookmark O2% during the dive prole blinking SLOW label when registered blinking ASC TIME label when the dive became a decompression dive.
Press the SMART (Select) button once to change the scroll buttons to scroll the different dives forward and backward (Fig. 4.10.). 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 (Fig. 4.11.). The memory will retain approximately the last 50 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 (assuming that the replacement has been done according to the instructions). DIVE PROFILE MEMORY [PROF] The scrolling of the prole will start automatically when the Logbook page IV (PROF) is entered. With the default setting, the dive prole is recorded and displayed in 30-second 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 prole. NOTE! Several repetitive dives are considered to belong to the same repetitive dive series if the noying time has not ended. See Dive Numbering in section 3.5.2. for further information.

Fig. 4.17. Setting Nitrox parameters, Oxygen percentage is 32%, oxygen partial pressure limit is 1.4 bar. 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. Accept settings by pressing MODE (OK).
4.2.2. Alarm settings [2 SET ALMS]
In the alarm settings you can set a dive time alarm and a maximum depth alarm. To enter Alarm settings select MODE - SET - SET ALARMS (Fig. 4.18).
Fig. 4.18 Set Alarms Mode Dive Time Alarm Setting
The instrument has one Dive Time Alarm Setting, which can be used for several purposes to add to your diving safety. The alarm can be set, for example, to your planned bottom time. Set the Dive Time alarm ON or OFF and the alarm time from 1 to 999 minutes. (Fig. 4.19).
Fig. 4.19. Setting Dive Time Alarm. Press scroll buttons to change alarm on/off and to set dive time value. Maximum Depth Alarm Setting
You can set one depth alarm in the dive computer. The depth alarm is set to 40 m [131 ft] at the factory, but you are able to adjust it according your personal preference or switch it off. The depth range can be set from 3.0 m to 100 m [9 ft to 328 ft] (Fig. 4.20.).
4.2.3. Setting Time and date [3 SET TIME]
To enter the Time Setting Mode select MODE- SETSET TIME (Fig. 4.21.)
Fig. 4.20. Setting Maximum Depth Alarm. Press scroll buttons to change alarm on/off and to set maximum depth value.
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 (Fig. 4.22.). After this you are able to set the correct year, month and day in this order (Fig. 4.23.). 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.
Fig. 4.21. Time Setting Mode
4.2.4. Personal adjustments [4 SET ADJ]
To enter the Personal adjustments mode select
MODE- SET- SET ADJ (Fig. 4.24). The adjustments are altitude, personal and dive computer units The current Altitude and Personal Adjustment modes are shown when diving and at the surface. If the mode does not match the altitude or personal conditions (see section 3.7. High Altitude Dives and Personal Adjustment), it is imperative that you enter the correct selection before diving. Use the Altitude Adjustment to select the correct altitude mode (Fig. 4.25.) Use the Personal Adjustment to add an extra level of conservatism (Fig. 4.26.). Use the units adjustment to choose choose between metric and imperial units (Fig. 4.27.).
Fig. 4.22. Adjusting Time
Fig. 4.23. Adjusting Date.
Fig. 4.24. Adjustment Setting Mode
Fig. 4.25. Setting Altitude adjustment. Press scroll buttons to change altitude mode.
Fig. 4.26. Setting Personal adjustment. Press scroll buttons to change personal mode.

Fig. 4.27. Setting Metric/ Imperial units.


This SUUNTO dive computer is a sophisticated precision instrument. Though designed to withstand the rigors of scuba diving you must treat it with 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 of the instrument 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 that may create an unwanted electric current between the contacts. It is important that the dive computer is carefully washed in fresh water after the days 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.
NEVER try to open the case of the dive computer. Service your dive computer every two years or after 200 dives (whichever comes rst) 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 biennial service. Do not attempt to do any service that you are not sure about how to do. Should moisture appear inside the case or battery compartment have the instrument checked immediately by your SUUNTO dealer or distributor. Should you detect scratches, cracks or other such aws on the display that may impair its durability, have it replaced immediately by your SUUNTO dealer or distributor. Check the spring bars holding the strap and the buckle for aws. If the exibility of the spring bars has reduced, have them replaced immediately 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

Calendar Clock: Accuracy: 25 s/month (at 20C [68F]). 12/24 h display.
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 199 min (- - after 199). Ascent time: 0 to 99 min (- - after 99). Ceiling depths: 3.0 to 100 m [10 to 328 ft].
Displays only in Nitrox mode: Oxygen%: 21 - 50. Oxygen partial pressure display: 1.2 - 1.6 bar depending on the limit setting. Oxygen Limit Fraction: 1 - 110% with 10% resolution (bar graph).
Logbook/Dive Prole Memory: Recording interval: 30 seconds Depth accuracy: 0.3 m [1 ft].
Operating Conditions - Normal altitude range: 0 to 3000 m [10000 ft] above sea level. - Operating temperature: 0C to 40C [32F to 104F]. - Storage temperature: -20C to +50C [ -4F to +122F]. 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, BS, MS and 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 (K5597) and O-ring 1,78 mm x 31,47 mm 70 ShA (K5664). - Battery storage time (shelf life): Up to three years. - Replacement: Every two years or more often depending on dive activity. - Life expectancy at 20C [68F]: - 0 dives/y -> 2 years - 100 dives/y -> 1,5 years - 300 dives/y -> 1 year The following conditions have an affect on the expected battery lifetime: The length of the dives. The condition in which the unit is operated and stored (e.g. temperature/ cold conditions). Below 10C [50F] the expected battery lifetime is about 50-75% of that at 20C [68F]. The use of the audible alarms.
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 into the unit at the factory.
NOTE! Low temperature or an internal oxidation of the battery may cause the battery warning even though the battery has enough capacity. In this case, the warning usually disappears when the Dive Mode is activated again.


NOTE! The warranty arrangements are different in different countries. The dive computer packaging contains information regarding the warranty benets and requirements applicable to your purchase. This Suunto dive computer is warranted against defects in workmanship and materials for a period of two years after purchase to the original owner subject to and in accordance with the terms and conditions set forth below: The dive computer should be serviced or repaired only by an authorized Suunto dealer or distributor. This warranty does not cover damage to the product resulting from improper usage, improper maintenance, neglect of care, alteration or unauthorized repair. This warranty will automatically become void if proper preventive maintenance procedures have not been followed as outlined in the use and care instructions for this product. If a claim under this or any other warranty appears to be necessary, return the product, freight prepaid, to your Suunto dealer or distributor or qualied repair facility. Include your name and address, proof of purchase and/or service registration card, as required in your country. The claim will be honored and the product repaired or replaced at no charge and returned in what your Suunto dealer or distributor determines a reasonable amount of time, provided all necessary parts are in stock. All repairs made, not covered under the terms of this warranty, will be made at the owners expense. This warranty is non-transferable from the original owner. All implied warranties, including but not limited to the implied warranties of merchantability and tness for a particular purpose, are limited from date of purchase and in scope to the warranties expressed herein. Suunto shall not be liable for loss of use of the product or other incidental or consequential costs, expenses or damage incurred by the purchase. All warranties not stated herein are expressly disclaimed. Some states do not allow the exclusion or limitation of implied warranties of consequential damages, so the above exclusions or limitations may not apply to you. This warranty gives you specic legal rights, and you may also have other rights that vary from state to state. This warranty does not cover any representation or warranty made by dealers or representatives beyond the provisions of this warranty. No dealer or representation is authorized to make any modications to this warranty or to make any additional warranty. Battery replacement is not covered by this warranty. This Instruction Manual should be kept with your dive computer.

8. SUUNTOSPORTS.COM is an international free web community where you can rene and share the data that you have measured with your personal Suunto instrument and analyzed with the sport-specic PC interface. offers you a number of features that help you to get the most out of your sport and your Suunto Computer. If you already own a personal Suunto sports instrument you can access all sport-specic functions through registration. If you do not yet have an instrument you may either log in as a guest or register yourself. As a guest you can view and read, but registration gives you the right to use other functions and participate to discussions.

SYSTEM REQUIREMENTS has the following system requirements: Internet Connection Modem: recommended 56k or faster Browser: IE 4.0 or better, Netscape 4.7x or newer Resolution: minimum 800 x 600, best viewed with 1024 x 768
SUUNTOSPORTS.COM SECTIONS includes three sections with several functions. The following paragraphs describe only the basic functions of You can nd detailed descriptions of all the site functions and activities and step-by-step instructions for using them from the site Help. The Help is available on each page and its icon is located on the right side of the bar dividing the screen. The Help is frequently updated as the site develops. offers several possibilities for searching the information on site. In addition to the free search, you can search, for example, for groups, users, resorts, logs and sports. The information published on the contains internal links so that you do not always have to search for the information from the very beginning. For example, if you view a description of a resort, you can follow the links and view the resort information senders personal information, logs related to the resort and charts created from the logs, if the sender has agreed to this information being made public. My Suunto The My Suunto section of the site is meant for your personal information. You can store information about yourself, your Suunto computer, your sporting and training activities, etc. When you upload your personal logs to they are

No-decompression time The maximum amount of time a diver may remain at a particular depth without having to make decompression stops during the subsequent ascent. No-decompression dive Any dive which permits a direct, uninterrupted ascent to the surface at any time. NO DEC TIME Abbreviation for no-decompression time limit. OEA = EAN = EANx Abbreviation for Oxygen Enriched Air Nitrox. OLF Abbreviation for Oxygen Limit Fraction. OTU Abbreviation for Oxygen Tolerance Unit. Oxygen Tolerance Unit Is used to measure the Whole-Body-Toxicity.
Oxygen Limit Fraction A term used by SUUNTO for the values displayed in the Oxygen Toxicity bargraph. The value is either the CNS% or the OTU%. Oxygen percentage or oxygen fraction in the breathing gas. Standard air has 21% oxygen. Oxygen partial pressure Limits the maximum depth to which the used Nitrox mixture can safely be 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 have the risk for immediate oxygen toxicity. PO2 Abbreviation for oxygen partial pressure. RGBM Reduced Gradient Bubble Model Repetitive dive Abbreviation for Reduced Gradient Bubble Model. Modern algorithm for tracking both dissolved and free gas in divers. Any dive whose decompression time limits are affected by residual nitrogen absorbed during previous dives. The amount of excess nitrogen remaining in a diver after one or more dives. Abbreviation for surface interval time. Elapsed time between surfacing from a dive and beginning a descent for the subsequent repetitive dive. Theoretical concept used to model bodily tissues for the construction of decompression tables or calculations. Another form of oxygen toxicity, which is caused by prolonged exposure to high oxygen partial pressures. The most common symptoms are irritation in the lungs, a burning sensation in the chest, coughing and reduction of the vital capacity. Also called Pulmonary Oxygen Toxicity. See also OTU. O2%
Residual nitrogen SURF TIME Surface interval time Tissue group

Whole-Body Toxicity

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 dealer.




LCD & battery check


Nitrox display
Activate the timekeeping display
Plan Time & alternate display Time & Bookmark in profile memory alternate display 2 MODE OPTIONS







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