THE INSTRUMENT IS NOT INTENDED FOR USE AT ALTITUDES GREATER THAN 2400 m [8000 ft]! Diving at altitudes above this limit may significantly increase the risk of decompression sickness. When diving at higher altitudes (above 700 m / 2300 ft), it is essential that the entered altitude mode, i.e. maximum altitude limit of the dive computer, exceeds or is equal to the altitude of the dive site. The altitude mode indicator must show either A1 or A2, depending on the altitude. More information about this is given in Section 3.6, Personal Adjustment and High Altitude Dives.
DECOMPRESSION DIVES WARNING!
DO NOT USE THIS INSTRUMENT TO CONDUCT DECOMPRESSION DIVES! Suunto does not recommend this instrument to be used to conduct decompression dives. However, if through carelessness or emergency a diver is forced to exceed the nodecompression limits on a dive, the instrument will provide decompression information required for ascent. After this the dive computer will continue to provide subsequent interval and repetitive dive information.

EMERGENCY ASCENTS

In the unlikely event that the instrument malfunctions during a dive, follow the emergency procedures provided by your certified dive training agency or, alternatively, immediately ascend at a rate slower than 10 m/min [33 ft/min] to a depth between 3 and 6 meters [10 to 20 ft] and stay there as long as your air supply will safely allow.
HIGHER RISK DIVE PROFILES
The user must understand that all decompression devices (decompression tables and/or dive computers) are based on mathematical models and that many experts are currently concerned that these models may not under certain conditions adequately describe the physiological phenomena. These conditions are presently identified as dives which incorporate the following (Fig. 1.1): SAWTOOTH PROFILES throughout the dive. where the diver alternates between greater and shallower depths repeatedly
REVERSE PROFILES where the diver spends most of the dive at shallow depths and then descends to the maximum depth shortly before surfacing. CONSECUTIVE DIVES where the diver performs repetitive dives to approximately the same maximum depth with only short surface intervals between dives. The risk of decompres sion sickness increases when depth and the number of repetitive dives increase and when the surface intervals are decreased. repetitive dives performed for several consecutive days.

MULTIDAY DIVES

DECOMPRESSION DIVES any dive during which the no-decompression limit has been exceeded or the diver is advised by the computer that he may not return directly to the surface.
DIVE PRACTICES WHICH INCLUDE THE ABOVE DESCRIBED HIGHER RISK DIVE PROFILES ARE BELIEVED TO INCREASE THE RISK OF DECOMPRESSION SICKNESS AND AS SUCH CONSIDERED POTENTIALLY DANGEROUS AND SHOULD BE AVOIDED EVEN IF THEY CONFORM TO THE MATHEMATICAL MODEL!
DO NOT USE THE DIVE COMPUTER WITH NITROX MIX! The mathematical tissue calculation model of the instrument has been designed for use with standard breathing air only (approximately 21% oxygen and 79% nitrogen by volume). Therefore, the dive computer must not be used for diving with Nitrox or other mixed gases.

Consecutive dives Sawtooth profiles

Reverse profiles

Multiday dives
Fig. 1.1 HIGHER RISK DIVE PROFILES
Fig. 1.2 RECOMMENDED PROFILE
DIVE COMPUTER LIMITATIONS
While the instrument is based on current decompression research and technology, the user/ diver must realize that the computer cannot monitor the actual physiological functions of an individual diver. All decompression schedules currently known to the authors, including the U.S. Navy Tables, are based on a theoretical mathematical model which is intended to serve as a guide to reduce the probability of decompression sickness. The mathematical model uses an ascent rate of 10 m/min [33 ft/min]. Therefore it is critical that a proper ascent rate is always used. The reader/diver is forewarned that individual physiological differences, severe environmental conditions and predive activities, especially those which tend to increase dehydration, may increase the risk of decompression sickness. As a safety precaution Suunto recommends that divers using this instrument should maintain no less than 10 minutes no-decompression time remaining at all times during the dive. This is especially important for divers in poor physical condition, in cold water or other arduous conditions. Historically divers have been advised to always include a margin of safety in their diving activities. Suunto supports these practices and strongly recommends that the diver make the deepest portion of the dive near the beginning of the dive and gradually progress into shallower depth, allowing time for a 3 to 5 minutes safety stop at a depth range of 3 to 6 meters (10 to 20 ft). This is believed to be effective in further reducing the risk of decompression sickness. Furthermore, the reader/diver is advised that any dive carries some risk of decompression sickness and neither the authors, nor SUUNTO Oyj will assume any responsibility or liability for accidents or injuries which might occur for any reason.
2. GETTING ACQUAINTED WITH THE DIVE COMPUTER
READ AND UNDERSTAND THE ENTIRE OWNERS MANUAL BEFORE DIVING! Failure to complete this step may result in serious personal injury. The purpose of this section is to provide the user with initial information to preview the operation of the computer. Since this information is limited, it is imperative that you read and understand the entire owners manual before attempting to dive.

2.1 WATER CONTACTS

The dive computer has three water contacts on the face of the instrument: COM: PLAN/ON: TIME/MODE: common contact activation and dive planning contact time display and mode selection contact
On the surface the instrument is operated by simultaneously touching the COM contact and one or two of the other contacts. When doing this, your finger tips should be wet or moist to establish the necessary electric contact. When submerged these contacts are automatically connected by the conductivity of the water.

2.2 ACTIVATION

The calendar clock is always shown on the display, when the dive computer is deactivated. In this mode the power consumption is minimal. The instrument is activated by touching the PLAN/ON and COM contacts (Fig 2.1). The first display, the STARTUP, shows all available elements and immediately after this the battery power indicator. A few seconds later the READY display will appear, showing zero values (Fig. 2.2). At this time, perform a precheck making sure that the dive computer operates correctly, that the low battery indicator is not on and that the personal/altitude adjustment setting is correct. If the battery symbol is displayed the dive computer should not be used (Fig. 2.3).
Fig. 2.1 ACTIVATION Touch the PLAN/ON and COM contacts with moistened fingers.

SURF TIME

DIVE TIME

Fig. 2.2 READYA1 DISPLAY

SURF TIME C DIVE TIME
Fig. 2.3 BATTERY WARNING The battery symbol indicates that the battery is too low for diving.
3. DIVING WITH THE DIVE COMPUTER
This section contains instructions on how to operate the dive computer and interpret its displays. Each display has been carefully designed to provide important information you will need to plan your dive or dive series. You will find that the nstrument is easy to use and read. Each display shows only the data relevant to that specific diving situation. For example, while you are on a dive, surface interval data is irrelevant and therefore not shown. On the other hand, while you are on the surface after a dive, remaining no-decompression time for that dive is irrelevant and therefore replaced with information for your next dive.
3.1 USE OF WATER CONTACTS
As described in Section 2.1, Water Contacts, the dive computer is controlled with the COM (common), PLAN/ON, and TIME/MODE contacts (Fig 3.1), as follows: Activation: Dive planning: touch the PLAN/ON and COM contacts. once the instrument has been activated, touch the PLAN/ON and COM contacts.

3.3 BEFORE DIVING

3.3.1 Activation, Prechecks and Battery Warning
The instrument is always ready for use and will activate if submerged. However, it is necessary to turn it on before diving to check the personal/ altitude adjustment setting, battery power, etc. This is done, either by immersing it in water for a couple of seconds or by connecting the PLAN/ON and COM contacts with fingertips. When deactivated the time display is always shown. Once activated all display elements will turn on (showing mostly figure 8s and graphical elements) (Fig. 3.3). A few seconds later the battery power bar graph is shown (Fig. 3.4). Next, the screen will alternate between two READY displays, confirming that the activation is complete (Fig. 3.5). At this time, perform your precheck making sure that:
SURF TIME NO DEC TIME DIVE DIVE CF TIME
Fig. 3.3 STARTUP I All segments shown.
A S LOG HIS C ALT SET PLAN NO R A T A E S LOG HIS C ALT SET PLAN R A T E LOG HIS ALT SET PLAN
the dive computer operates and provides a complete display the low battery indicator is not on the personal/ altitude adjustment setting is correct The instrument is now ready for diving. If it is not taken on a dive after activation, it will automatically switch off to the time display in 10 minutes to conserve the battery power. The dive computer does not need to be reactivated for repetitive dives. It will remain active until it has calculated that all residual nitrogen has off-gassed. This may take up to 48 hours, as described in Section 6.1, Operating Principles.
Fig. 3.4 STARTUP II Battery power indicator. When two or less bar graph segments are shown the computer should not be used for diving. (First generation LUX/LUX S computers: When four or less bar graph segments are shown the computer should not be used for diving. For further information see NOTE on page 24.)
PERSONAL ADJUSTMENT AND HIGH ALTITUDE DIVING WARNING!
SET THE CORRECT PERSONAL/ALTITUDE ADJUSTMENT MODE! When diving at altitudes greater than 700 m [2300 ft] the personal/altitude adjustment feature must be correctly selected in order for the computer to calculate no-decompression status. The diver should also use this option to make the calculations more conservative, whenever it is believed that factors which tend to increase the possibility of decompression sickness exist (see Section 3.6). Failure to properly select the personal/altitude adjustment mode correctly will result in erroneous data and can greatly increase the risk of decompression sickness.
THE DIVE COMPUTER IS NOT INTENDED FOR USE AT ALTITUDES GREATER THAN 2400 m [8000 ft]! Diving at altitudes above this limit may significantly increase the risk of decompression sickness. If you are diving at higher altitudes, make sure that the altitude mode has been set according to the altitude of your dive site. For information on how to select the correct altitude setting and how to use the personal adjustment, see Section 3.6, Personal Adjustment and High Altitude Dives.

NO DEC TIME DIVE DIVE TIME
Fig. 3.6 DIVE PLANNING The no-decompression time limit at 30.0 m [100 ft] is 14 minutes in A1 mode.
DIVE NUMBERING SHOWN DURING DIVE PLANNING
Several repetitive dives are considered to belong to the same repetitive dive series when the dive computer has not deactivated itself. The first dive of the series will be numbered as DIVE 1, the second as DIVE 2, the third as DIVE 3 etc. (Fig. 3.7). When the surface time has been less than 10 minutes, the dives are considered to be the same. The dive number will not change for the second part of such a dive and the dive time will start where it left off.
Fig. 3.7 DIVE PLANNING The no-decompression time limit at 30.0 m [100 ft] is decreased to 5 minutes in A1 mode after the third dive of the series.
3.3.3 Calendar Clock Function
The calendar clock is always shown on the display, when the instrument is deactivated. Once the dive computer is activated the TIME display can be retrieved any time on the surface mode by touching the TIME/MODE and COM contacts for about two seconds. The current time and date will be shown for four seconds (Fig. 3.8).
Fig. 3.8 TIME DISPLAY The time is 10:30 [in case of imperial unit, A for a.m. and P for p.m. would be shown in the upper left corner of the display]. The date is 18.2 or February 18th. PLEASE NOTE: The date will always be displayed with the day of the month first, followed by the month.
When diving, the dive entry time and date is registered in the logbook memory. Remember always to check before diving that the clock is set, especially when traveling to different time zones. For adjusting the clock, refer to Sec. 4.4, Setting Time and Date. In the metric version of the instrument, the 24-hour time system is used, while in the imperial version the 12-hour time system is used.

3.4 DIVING

3.4.1 Basic Dive Data
The dive computer will remain in the SURFACE mode at depths less than 1.2 m [4 ft] (first generation computers 1.8 m [6 ft]). At depths greater than 1.2 m (1.8 m first generation computers) the instrument will go into the DIVE mode. Each piece of information on the display is clearly marked (Fig. 3.9). During a no-decompression dive, the following information will be shown: the available no-decompression time (a) in minutes is shown as NO DEC TIME. It is calculated based on the five factors listed in Section 6.1, OPERATING PRINCIPLES. your present depth (d) is shown in meters [ft]. the elapsed dive time (f) in minutes in the lower right corner, shown as DIVE TIME.

LOG HIS A S C R A T E

NO DEC TIME

R A T E

LOG HIS C ALT

SET PLAN DIVE TIME

the personal/ altitude adjustment (e) setting (A0, A1, or A2). In the lower left corner the following information will alternate:

the maximum depth during this dive (b) in meters [ft], indicated as MAX, for about 5 seconds. the water temperature (c), with C for Centigrade [or F for Fahrenheit], for about 3 second.
Fig. 3.9 DIVING DISPLAY The present depth is 19.3 m [63 ft] (d), the no-decompression time limit is 23 minutes (a) in A1 mode (e) and the dive time is 6 minutes (f). Maximum depth during this dive 29.8 m [98 ft] (b) and water temperature 18C [64F] (c) are alternating in the lower left corner.
3.4.2 Reverse No-Decompression Time Bar Graph
The available no-decompression time is also shown visually in the multi-function bar graph in the bottom of the display (Fig. 3.10). When your available no-decompression time decreases below 60 minutes, the first bar graph segment appears. As your body absorbs more nitrogen, more segments start to appear.

Green Zone (a)

As a safety precaution Suunto recommends that divers using the dive computer should maintain the no-decompression bar graph within the green zone.
Fig. 3.10 REVERSE NODECOMPRESSION TIME BAR GRAPH The first bar from the left appears, when the available no-decompression time decreases below 60 minutes. The following bars appear, when the available nodecompression time decreases below 40, 30, 20 (green zone, a) and 10 minutes (yellow zone, b). A

S C R A T E

Yellow Zone (b)
As all of the bars appear (yellow zone), your no-decompression limit is less than 10 minutes and you are getting very close to no-decompression limits. At this point, you should start your ascent towards the surface.
Fig. 3.11 ASCENT RATE INDICATOR Pointer at position two: ascent rate 7 - 9 m/min [23 - 30 ft/min].
3.4.3 Ascent Rate Indicator
The ascent rate is shown graphically with a pointer in the upper left corner, next to the notation ASC RATE, as follows:

NO DEC TIME C DIVE TIME

Ascent rate indicator

No segments

Ascent speed
Below 5 m/min [16 ft/min] 5 - 7 m/min [16 - 23 ft/min] 7 - 9 m/min [23 - 30 ft/min] 9 - 11 m/min [30 - 36 ft/min] Above 11 m/min [36 ft/min] Above 10 m/min [33 ft/min]

Example in Fig. no.

Fig. 3.12 ASCENT RATE INDICATOR Pointer at position three: ascent rate 9 - 11 m/min [30 - 36 ft/min].

Segment one

Segment two

Segment three

NO DEC TIME DIVE TIME

Segment four

Blinking SLOW
Fig. 3.13 ASCENT RATE INDICATOR Pointer at position four: ascent rate is more than 11 m/min [36 ft/min]. Blinking SLOW displayed means that the ascent rate 10 m/min [33 ft/min] has been violated continuously. This is a caution to slow down!
The SLOW warning alternates with the current depth. The SLOW warning is an indication that the maximum ascent rate has been exceeded continuously, whereas the ascent rate indicator shows present ascent speed. Whenever the SLOW warning appears, you should immediately slow down or stop your ascent until the warning disappears. You must not ascend shallower than 3 m [10 ft] with the SLOW warning on. If you reach this depth with SLOW on, you must stop at this depth and wait until the warning disappears.

RAPID ASCENTS INCREASE THE RISK OF INJURY! Do not exceed the maximum recommended ascent rate. You must never surface with the SLOW warning on. If you do this, the warning will continue to flash until the unit deactivates itself in the normal manner. This may take up to 40 hours.
DO NOT ATTEMPT TO DIVE FOLLOWING A SURFACE INTERVAL DURING WHICH THE SLOW INDICATOR REMAINS ACTIVATED! Violation of the maximum ascent rate may invalidate the calculations for the next dive. NOTE: SUUNTO highly recommends a safety stop at the end of every dive in the range of 3 m - 6 m [10 ft - 20 ft] for 3 - 5 minutes.

3.4.4 Alarms

The standard and LUX models feature visual alarms, and the LUX S visual as well as audible alarms, to alert you when you are approaching dangerous situations. Potential danger situations during a dive, occurs when: the no-decompression dive turns into a decompression dive. One arrow pointing upwards and the ascend warning CEILING/ASC TIME will appear (Fig. 3.14). LUX S model gives also an audible alarm: three single beeps. the maximum allowed ascent rate, 10 m/min [33 ft/min], is exceeded. A blinking SLOW warning will alternate with the depth display (Fig. 3.13). LUX S model gives also an audible alarm; continuous beep. the ceiling depth is exceeded. A downward pointing arrow and a blinking error warning Er will appear (Fig.3.17). LUX S model gives also an audible alarm: continuous beep. You should immediately descend to or below the ceiling. The dive computer will otherwise enter a permanent error mode in three minutes, indicated by a non-blinking Er. the ceiling descends to 10 m [30 ft]. A blinking error warning Er appears. You should immediately ascend to or below the ceiling. the ceiling descends to 12 m [39 ft]. A permanent error warning Er appears. In this mode the instrument can only be used as a depth gauge and timer.
Immediate danger, happens when:
The permanent ERROR MODE is shown by a non-blinking Er in the center display. Once in ERROR MODE, the dive computer will continue to display current depth and dive time. 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. When the surface has been reached, no further diving or flying should take place for a minimum of two days.
3.4.5 Decompression dives
DO NOT USE THIS INSTRUMENT TO CONDUCT DECOMPRESSION DIVES! Suunto does not recommend this instrument to be used to conduct decompression dives. However, if through carelessness or emergency a diver is forced to exceed the no-decompression limits on a dive, the dive computer will provide 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 permits you to decompress within a range of depths.

Fig 3.16 OCTOPUS II DECOMPRESSION DIVE, AT THE CEILING ZONE The two arrows (a) point at each other ("hour glass"). You are at the ceiling zone at 3.5 m [11 ft] (c) and the ceiling is at 3 m [10 ft] (b).
Fig. 3.17 DECOMPRESSION DIVE, ABOVE CEILING Note the downward pointing arrow and the blinking Er warning. You should immediately (within 3 minutes) descend to or below the ceiling.
When the sea surface is rough, it may be difficult to maintain a constant depth near the surface. In this case it will be more manageable to maintain an additional distance below to the ceiling, to make sure that the waves do not lift you above the ceiling. SUUNTO recommends that decompression takes place deeper than 4 m [13 ft], even if the indicated ceiling is shallower. NOTE: It will take more time and more air to decompress below the ceiling than at the ceiling.

DISPLAY ABOVE CEILING

If you ascend above the ceiling, a downward pointing arrow will appear (Fig 3.17). In addition a blinking error warning Er reminds you that you have only three minutes to correct the situation. You must immediately descend to or below the ceiling. If you continue to violate the decompression requirements, the dive computer goes into a permanent ERROR MODE. In this mode (Fig. 3.18) you must not dive again for at least two days. See also Section 3.7, Error Conditions. During decompression, ASC TIME will count down toward zero. When the ceiling moves upwards, you can ascend to the new ceiling. You may surface only when the ascent time reaches zero and CEILING/ASC TIME is replaced by NO DEC TIME.
C ASC TIME NO CEILING LOG HIS ALT SET

NO DEC TIME DIVE

WARNING !
NEVER LET THE CEILING DEPTH DESCEND DEEPER THAN 9 m [30 ft]. When the ceiling is deeper than 9 m [30 ft], a blinking error warning Er will appear and when the 12 m [39 ft] ceiling is reached the dive computer will go into a permanent error mode.
Fig. 3.18 DISPLAYS AFTER VIOLATED DECOMPRESSION DIVE The blinking CEILING/ASC TIME symbol (a) indicates that you have violated the ceiling for more than three minutes or the maximum ceiling depth of 12 m [39 ft] was exceeded. The instrument will stay as a depth gauge and timer for 39 hours 59 minutes = no fly time (b). After 2 hours 30 minutes surface interval time the no fly time is 37 hours 29 minutes. In the dive planning mode the Er warning is displayed instead of the nodecompression time (c). You must not dive again or fly for at least two days.

Table 3.2 ALTITUDE RANGES
Altitude mode A0 A1 A2 Altitude range 0 - 700 m 700 - 1500 m 1500 - 2400 m [0 - 2300 ft] [2300 - 5000 ft] [5000 - 8000 ft]

PERSONAL ADJUSTABILITY

The factors, which tend to increase the possibility of decompression sickness, include but are not limited to: cold exposure - water temperature less than 20C [68F] the diver is below average physical fitness level multiday or repetitive dive exposure diver fatigue dehydrated conditions previous history of decompression sickness
This feature should be used to adjust the computer to intentionally introduce a factor to make it more conservative according to personal preference by entering a higher altitude mode than required in table 3.2 (i.e. diving at sea level with the personal/ altitude adjustment set at A1 or A2). The no-decompression limits are then shortened accordingly (Tables 6.1 and 6.2).

3.7 ERROR CONDITIONS

The instrument is provided with warning indicators that advise the user to react to certain situations that would otherwise give rise to a significantly increased risk of decompression sickness if left unattended. If you do not respond to its warnings, it will enter a permanent ERROR MODE, indicating that the risk of decompression sickness has greatly increased. If you understand and operate the dive computer sensibly, it is unlikely that you will ever put the instrument into the ERROR MODE. The permanent ERROR MODE is shown by a non-blinking Er in the center display. Once in ERROR MODE, the dive computer will continue to display current depth and dive time. 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. When the surface has been reached, no further diving or flying should take place for a minimum of two days.

OMITTED DECOMPRESSION

The most common ERROR MODE results from omitted decompression, when the diver stays above the ceiling for more than three minutes. During this three-minute period the Er warning will blink alternating with the CEILING/ASC TIME display. The instrument will continue to function normally, if the diver descends below the ceiling within three minutes. After this the dive computer will enter a permanent ERROR MODE. In the permanent ERROR MODE the instrument will not show no-decompression or ascent times. Only a permanent Er warning is shown in the center window. However, all the other displays will function as before, to provide information for ascent. At the surface mode, the CEILING/ASC TIME symbol will blink in the center window and at the dive planning mode a permanent Er is shown instead of no-decompression times.
EXTREME CEILING DEPTH OR DECOMPRESSION RANGE
When the ceiling descends to the depth of 10 m [30 ft] or when the ASCent TIME is longer than 63 minutes, the Er warning will start to blink in the center window. If the diver immediately ascends, the dive computer will continue to function normally after the ceiling is back to below 10 m [30 ft] or the ASCent TIME is shorter than 63 minutes. If the ceiling descends to the depth of 12 m [39 ft] even momentarily the instrument will enter the permanent ERROR MODE. NOTE: Ascent time is not displayed in the Octopus II dive computer.

4. MENU BASED MODES

The menu based functions include the logbook and history memories, the personal/altitude adjustment setting, and the date and time setting. The menu based functions are activated using the water contacts. Keep your fingers on the TIME/MODE and COM contacts while the dive computer scrolls through the menu (Fig. 4.1).
The desired mode is selected by breaking the finger contact when the desired mode appears on the display:
LOG: HIS: Alt: Set: Logbook Memory. The Logbook gives a summary of the nine most recent dives. Dive History Memory. The Dive History is a summary of all dives recorded by the instrument. Personal/Altitude Adjustment setting Date and Time Setting

LOG HIS ALT

A S C R A T E SET PLAN
When scrolling through the menu, a bar segment on the bottom of the display will indicate the scrolling sequence. Make sure that the contacts and the instrument itself are dry and clean before trying to use the menu based modes. NOTE: The menu based modes can be activated only when 10 minutes have elapsed after the dive. All menu based modes can be deactivated by the RETURN command, i.e. by connecting all three contacts simultaneously, or by immersing the dive computer in water.
Fig. 4.1 MENU The instrument will scroll through the above displays.

4.1 LOGBOOK MEMORY

The dive computer has a sophisticated high capacity Logbook Memory. Dives shorter than one minute are not registered. The logbook memory is activated by touching the TIME/MODE and COM contacts until LOG appears. It will give access to the nine most recent dives made. The following information will be shown on three alternating displays (Fig. 4.2 - 4.5):

LOG HIS ALT SET

Fig 4.2 LOGBOOK, DISPLAY I This display will alternate between DISPLAYS II and III. The maximum depth (a) of the second recent dive (c) was 28.6 m [94 ft] and the total dive time 29 min (e). The personal/altitude adjustment mode was set to A1 (d) and the minimum no-decompression time during the dive was 3 minutes (b).
DISPLAY I, main display (Fig. 4.2):
maximum depth (a) dive number (c) dive time (e) personal/altitude adjustment setting (d) the minimum NO DEC TIME or maximum ASC TIME reached during the dive (b) SLOW if the diver has surfaced with this warning on downward pointing arrow if the ceiling was violated Er in the center window, if the ceiling was violated permanently (over 3 min) or if the 12 m [39 ft] ceiling was reached or if the ASC TIME was over 63 min.

CHANGE VALUE

Fig. 4.12 TIME SETTING Ready to adjust the hour reading (blinking).

TIME MODE COM

PLAN ON
2. The hour display starts to blink immediately (Fig. 4.12). If you want to change it, keep the PLAN/ON and COM contacts connected. The hours will start to scroll (Fig. 4.13). Release your fingers immediately when the correct value is displayed. [To change the A or P for a.m. or p.m. scroll the hours past 12:00]. 3. To scroll through the minute, month and date, keep the TIME/MODE and COM contacts connected. Release your fingers when the display you wish to change is blinking (Fig. 4.14). Repeat step 2 to change this value (Fig. 4.15).
Fig. 4.13 TIME SETTING Adjusting the hour reading, PLAN/ON & COM.
NOTE: In case of the minutes and date, the change is made separately for both digits, as shown by the blinking digit. In case of the hours and month, the complete number is changed simultaneously. 4. Repeat steps 2 and 3 to change any additional values. 5. Exit the Time Setting mode with the RETURN command, i.e. by connecting all three
contacts at the same time. First make contact between the PLAN/ON and TIME/MODE contacts and after that with the COM contact.
NOTE: The clock is on (time is elapsing) when setting it and exiting the Time Setting mode. It is not possible to reset the seconds. Remember to regularly check that the clock is on time especially when traveling to different time zones, as the entry time of all dives is stored in the logbook memory.
Fig. 4.14 TIME SETTING Scrolling through hours, minutes, month and date, TIME/MODE & COM.
Fig. 4.15 TIME SETTING Adjusting the ten minute reading (blinking), PLAN/ON & COM.

5. CARE AND MAINTENANCE

The dive computer is a sophisticated precision instrument. Remember to treat it as such! It has been designed to withstand the rigors of scuba diving. It can be installed in a durable thermoplastic console boot and its display can be protected by a replaceable display shield. The user should wash and rinse the unit in fresh water after every use. Protect it from shocks, extreme heat or direct sunlight and chemical attack. The instrument cannot withstand the impact of heavy objects like scuba cylinders, nor chemicals like acetone and alcohols (ethanol, isopropanol). NOTE: Keep the water contacts clean to assure correct operation of the dive computer. Store the instrument in a dry place. NOTE: Frequently check the battery compartment for moisture through the transparent battery cover of the instrument especially after the battery replacement. The dive computer should be serviced every two years or after 300 dives (whichever comes first) by an authorized dealer. This service will include a general operational check and battery replacement. The service requires special tools and training. Therefore, it is advisable to contact an authorized Suunto dealer for biennial service. Do not attempt to do any servicing that you are not trained for. The instrument will display a battery symbol as a warning when the power gets too low. When this happens, the dive computer should not be used until the battery has been replaced (see also chapter 3.3.1 /Battery Warning).

The no-decompression limits in the U.S. Navy tables are based upon six theoretical compartments for single dives, and one compartment for surface intervals and repetitive dives. If you are familiar with table theory, you may know that they are characterized by half times (i.e. the time required for 50 % equilibration to a pressure change) ranging from 5 minutes to 120 minutes. The instrument includes the same six compartments, and two additional compartments for an increased range of the mathematical model. The calculations are based on all eight compartments for all phases of diving, including surface intervals and repetitive dives. The dive computers half times range from 2.5 to 320 minutes. The multi-level tissue calculations are based on modified Haldanean principle.

ALTITUDE DIVING

The atmospheric pressure is lower at high altitudes than at sea level. After traveling to a higher altitude, the diver will have additional nitrogen in his body, compared to the equilibrium situation at the original altitude. This additional nitrogen is released gradually in time and equilibrium is reached within a couple of days. Before high altitude diving the instrument must be set to high altitude diving mode to take this into account. 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 limits are considerably reduced.

SURFACE INTERVALS

The dive computer requires a minimum surface interval of 10 minutes between dives. If a surface interval is shorter than 10 minutes, the instrument dive counter and dive timer treat the next dive as a continuation of the previous dive. It adds the dive times, and calculates no-decompression limits or decompression stops based on excess nitrogen absorbed on both dives. In this regard, it is similar to the U.S. Navy tables.

DEPTH LIMITS WARNING!

SUUNTO STRONGLY RECOMMENDS THAT SPORT DIVERS LIMIT THEIR MAXIMUM DEPTH TO 40 m [130 ft]! However, the dive computer will calculate below that depth to provide a wide margin of flexibility if, through carelessness or emergency, you are forced to exceed this recommended depth limit for a dive.

4 1. INTRODUCTION Congratulations on your choice of the FAVOR AIR dive computer. The FAVOR AIR is a compact and sophisticated dive instrument that will give you years of troublefree and joyful diving. The FAVOR AIR dive computer will provide you with important information that you will need during, between, and after your dives. Key Features The FAVOR AIR is equipped with a sophisticated electroluminescent LUX backlite display, which does not significantly reduce battery life because of the highly energyefficient system design and because the lamp goes off automatically after approximately 10 seconds from activation. The electroluminescent lamp will give excellent backlite quality in darkness and low ambient light conditions. The backlite is not visible during daylight. The FAVOR AIR monitors and reports vital information such as your dive time, current depth, maximum depth, no-decompression time, cylinder pressure, remaining air time and ascent rate. It will also give you information, if through carelessness or emergency you are forced to exceed the no-decompression limits for any dive. The FAVOR AIR features versatile logbook memory capabilities and a history memory for long-term historical data. The instrument can be adjusted for diving at different altitudes or to add an extra level of conservativeness to the diving if desired. The FAVOR AIR has a built-in calendar and clock. The calendar time display can also be activated when diving. The screen is protected against scratches and damage by an easily replaceable shield. The FAVOR AIR is available as a console. The modular construction allows for a separate compass module to be attached to the console at a later stage. Metric and Imperial Units All examples in this manual are shown in metric units, including meters, bars and C. The corresponding imperial units are shown in brackets. The FAVOR AIR is also available with imperial units, i.e. feet, psi and F. WARNING! VERIFY THAT THE UNITS OF MEASURE, WHETHER METRIC OR IMPERIAL, ARE CORRECT BEFORE DIVING! Any confusion resulting from improper selection of units may cause the diver to commit errors that may lead to serious injury.
2. FOR YOUR SAFETY Always remember that THE DIVER IS RESPONSIBLE FOR HIS OR HER OWN SAFETY! When used properly the FAVOR AIR is an outstanding tool for assisting properly trained, certified divers in planning and executing standard and multi-level sport dives within the described no-decompression limits. It is NOT A SUBSTITUTE FOR CERTIFIED SCUBA INSTRUCTION including training in the principles of decompression. DO NOT attempt to use the FAVOR AIR without reading this entire Instruction Manual. If you have any questions about the manual or the FAVOR AIR, contact your Suunto dealer before diving with the FAVOR AIR. Back-Up Instruments WARNING! USE BACK-UP INSTRUMENTS! Make certain that you use back-up instrumentation including a depth gauge, a submersible pressure gauge, a timer or watch, and have access to decompression tables whenever diving with the FAVOR AIR. Cylinder pressure Before each dive, make sure that your air pressure is sufficient for the planned dive. While diving, check the cylinder supply pressure frequently. Sharing the FAVOR AIR WARNING! THE FAVOR AIR SHOULD NEVER BE TRADED OR SHARED BETWEEN USERS WHILE IT IS IN OPERATION! Its information will not apply to someone who has not been wearing it throughout a dive or sequence of repetitive dives. Its dive profiles must match that of the user. If it is left on the surface during any dive, it will give inaccurate information for subsequent dives. No dive computer can take into account dives made without the computer. Thus any diving activity 48 hours prior to initial use of the computer may give misleading information and must be avoided. Personal/High Altitude Adjustment More information about this is given in Section 3.6, "Personal Adjustment and High Altitude Dives".

WARNING! SET THE CORRECT PERSONAL/ALTITUDE ADJUSTMENT MODE! When diving at altitudes greater than 700 m [2300 ft] the personal/altitude adjustment feature must be correctly selected in order for the computer to calculate no-decompression status. The diver should also use this option to make the calculation more conservative, whenever it is believed that factors which tend to increase the possibility of decompression sickness exist (see Section 3.6). Failure to properly select the personal/altitude adjustment mode correctly will result in erroneous data and can greatly increase the risk of decompression sickness. WARNING! THE FAVOR AIR IS NOT INTENDED FOR USE AT ALTITUDES GREATER THAN 2400 m (8000 ft)! Diving at altitudes above this limit may significantly increase the risk of decompression sickness. When diving at higher altitudes (above 700 m/2300 ft), it is essential that the entered altitude mode, i.e. maximum altitude limit of the FAVOR AIR, exceeds or is equal to the altitude of the dive site. The altitude mode indicator must show either A1 or A2, depending on the altitude. Decompression Dives WARNING! DO NOT USE THIS INSTRUMENT TO CONDUCT DECOMPRESSION DIVES! Suunto does not recommend this instrument to be used to conduct decompression dives. However, if through carelessness or emergency a diver is forced to exceed the no-decompression limits on a dive, the FAVOR AIR will provide decompression information required for ascent. After this the FAVOR AIR will continue to provide subsequent interval and repetitive dive information. Emergency Ascents In the unlikely event that the FAVOR AIR malfunctions during a dive, follow the emergency procedures provided by your certified dive training agency or, alternatively, immediately ascend at a rate slower than 10 m/min [33 ft/min] to a depth between 3 and 6 meters [10 to 20 ft] and stay there as long as your air supply will safely allow. Higher Risk Dive Profiles The user must understand that all decompression devices (decompression tables and/or dive computers) are based on mathematical models and that many experts are currently concerned that these models may not under certain conditions adequately describe the physiological phenomena. These conditions are presently identified as dives which incorporate the following: - SAWTOOTH PROFILES where the diver alternates between greater and shallower depths repeatedly throughout the dive.
- REVERSE PROFILES where the diver spends most of the dive at shallow depths and then descends to the maximum depth shortly before surfacing. - CONSECUTIVE DIVES where the diver performs repetitive dives to approximately the same maximum depth with only short surface intervals between dives. The risk of decompression sickness increases when depth and the number of repetitive dives increase and when the surface intervals are shortened. - MULTIDAY DIVES repetitive dives performed during several consecutive days. - DECOMPRESSION DIVES any dive during which the no-decompression limit has been exceeded or the diver is advised by the computer that he may not return directly to the surface. WARNING! DIVE PRACTICES WHICH INCLUDE THE ABOVE DESCRIBED "HIGHER RISK DIVE PROFILES" ARE BELIEVED TO INCREASE THE RISK OF DECOMPRESSION SICKNESS AND AS SUCH CONSIDERED POTENTIALLY DANGEROUS AND SHOULD BE AVOIDED EVEN IF THEY CONFORM TO THE MATHEMATICAL MODEL! Dive Computer Limitations While the FAVOR AIR is based on current decompression research and technology, the user/diver must realize that the computer cannot monitor the actual physiological functions of an individual diver. All decompression schedules currently known to the authors, including the U.S. Navy Tables, are based on a theoretical mathematical model which is intended to serve as a guide to reduce the probability of decompression sickness. The mathematical model uses a constant ascent rate of 10 m/min [33 ft/min] already in the early stage of ascent to prevent the formation of microbubbles. Therefore, it is critical that a proper ascent rate is always used. The reader/diver is forewarned that individual physiological differences, severe environmental conditions and predive activities, especially those which tend to increase dehydration, may increase the risk of decompression sickness. As a safety precaution, Suunto recommends that divers using the FAVOR AIR should maintain no less than 10 minutes no-decompression time remaining at all times during the dive. This is especially important for divers in poor physical condition, in cold water or other arduous conditions. Historically divers have been advised to always include a margin of safety in their diving activities. Suunto supports these practices and strongly recommends that the diver make the deepest portion of the dive near the beginning of the dive and gradually progress into shallower depth, allowing time for a 3 to 5 minutes

3.4 DIVING 3.4.1 Basic Dive Data The FAVOR AIR will remain in the SURFACE mode at depths less than 1.8 m [6 ft]. At depths greater than 1.8 m the FAVOR AIR will go into the DIVE mode. Each piece of information on the display is clearly marked. During a no-decompression dive, the following information will be shown:
- the available no-decompression time in minutes is shown as NO DEC TIME. It is calculated based on the five factors listed in Section 6.1, "Operating Principles". - your present depth is shown in meters [ft]. - the personal/altitude adjustment setting (A0, A1, or A2). - the cylinder pressure and air time. Discussed in section 3.4.2. In the lower left corner the following information will alternate: - the elapsed dive time in minutes, shown as DIVE TIME, for 11 seconds. - the maximum depth during this dive in meters [ft], indicated as MAX, for about 3 seconds. - the water temperature, with C for Centigrade [or F for Fahrenheit], for about 2 seconds.
3.4.2 Cylinder Pressure Data The air pressure of your scuba cylinder in bars [psi] will be shown digitally in the lower right corner of the display. Anytime you enter into a dive, the remaining air time calculation begins. After 30 - 60 seconds (sometimes more, depending on your air consumption), the first estimation of remaining air time will be shown in the center window of the display. The calculation is always based on the actual pressure drop in your cylinder and will automatically adapt to your cylinder size and current air consumption. The change in your air consumption will be based on constant one second interval pressure measurements over 30 - 60 second periods. An increase in air consumption will influence the remaining air time rapidly, while a drop in air consumption will increase the air time slowly. Thus a too optimistic air time estimation, caused by a temporary drop in air consumption, is avoided. The calculations of the remaining air time include a 35 bar [500 psi] safety buffer. This means that when the FAVOR AIR shows the air time to be zero, there is still about 35 bar [500 psi] pressure left in your cylinder depending on your air consumption rate. With a high consumption rate the limit will be close to 50 bar [725 PSI] and with a low rate close to 35 bar [500 PSI]. NOTE: NOTE: Filling your BC will affect the air time calculation, due to the temporary increase in air consumption. A change of temperature will affect the cylinder pressure and consequently the air time calculation.
16 Low Air Pressure Warnings The FAVOR AIR will warn you with three audible double beeps and a blinking pressure display when the cylinder pressure reaches 50 bar [725 psi]. The following three double beeps are heard when the cylinder pressure reaches 35 bar [500 psi] and the remaining air time reaches zero. 3.4.3 Ascent Rate Indicator The ascent rate is shown graphically with a pointer in the upper left corner, next to the notation ASC RATE, as follows: Ascent rate indicator No segments Pointer in the lowest position Pointer in the second lowest position Pointer in the horizontal position Pointer in the upper position Blinking SLOW Ascent speed Below 5 m/min [16 ft/min] 5 - 7 m/min [16 - 23 ft/min] 7 - 9 m/min [23 - 30 ft/min] 9 -11 m/min [30 - 36 ft/min] Above 11 m/min [36 ft/min] Above 10 m/min [33 ft/min]

The SLOW warning alternates with the current depth. The SLOW warning is an indication that the maximum ascent rate has been exceeded continuously, whereas the ascent rate indicator shows present ascent speed. Whenever the SLOW warning appears, you should immediately slow down or stop your ascent until the warning disappears. You must not ascend shallower than 3 m [10 ft] with the SLOW warning on. If you reach this depth with SLOW on, you must stop at this depth and wait until the warning disappears. WARNING! RAPID ASCENTS INCREASE THE RISK OF INJURY! Do not exceed the maximum recommended ascent rate. You must never surface with the SLOW warning on. If you do this, the warning will
17 continue to flash until the unit deactivates itself in a normal manner. This may take up to 40 hours. WARNING! DO NOT ATTEMPT TO DIVE FOLLOWING A SURFACE INTERVAL DURING WHICH THE SLOW INDICATOR REMAINS ACTIVATED! Violation of the maximum ascent rate may invalidate the calculations for the next dive. NOTE: SUUNTO highly recommends a safety stop at the end of every dive in the range of 3m - 6m [10ft - 20ft] for 3 - 5 minutes. 3.4.4 Audible and Visual Alarms The FAVOR AIR features audible and visual alarms to alert you when you are approaching dangerous situations or to acknowledge certain commands given by you. Acknowledgement of commands using the water contacts: a short single beep, occurs when: - the FAVOR AIR is activated - the water contacts are connected in the surface mode Potential danger situations during a dive: three beeps, occurs when: - the no-decompression dive turns into a decompression dive. An arrow pointing upwards and the decompression warning CEILING/ASC TIME will appear. Cylinder pressure and air time alarms: three double beeps, occurs when: - the cylinder pressure reaches 50 bar [725 psi]. The cylinder pressure display will start to blink. - the cylinder pressure reaches 35 bar [500 psi]. - the calculated remaining air time reaches zero. Immediate danger: continuous beeps, occurs when: - the maximum allowed ascent rate, 10 m/min [33 ft/min], is exceeded. A blinking SLOW warning will alternate with the depth display. - the ceiling depth is exceeded. A downward pointing arrow and a blinking error warning Er will appear. You should immediately descend to or below the ceiling. The FAVOR AIR will otherwise enter a permanent error mode in three minutes, indicated by a non-blinking Er. Immediate out-of-range danger, occurs when: - the ceiling descends deeper than 9 m [30 ft]. A blinking error warning Er appears. You should immediately ascend to or below the ceiling.

18 - the ceiling descends to 12 m [39 ft]. A permanent error warning Er appears. In this mode the FAVOR AIR can only be used as a depth gauge and timer. The permanent ERROR MODE is shown by a non-blinking Er in the center of the display. Once in ERROR MODE, the FAVOR AIR will continue to display current depth and dive time. 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. When the surface has been reached, no further diving or flying should take place for a minimum of two days. 3.4.5 Decompression dives WARNING! DO NOT USE THIS INSTRUMENT TO CONDUCT DECOMPRESSION DIVES! Suunto does not recommend this instrument to be used to conduct decompression dives. However, if through carelessness or emergency a diver is forced to exceed the no-decompression limits on a dive, the FAVOR AIR will provide decompression information required for ascent. After this the FAVOR AIR will continue to provide subsequent interval and repetitive dive information. Rather than requiring you to make stops at fixed depths, the FAVOR AIR permits you to decompress within a range of depths. Background When your NO DEC TIME becomes zero, your dive becomes a decompression dive, i.e. you must perform one or several decompression stops on your way to the surface. The NO DEC TIME on your display will be replaced by a flashing notation CEILING/ASC TIME. WARNING! YOU SHOULD ASCEND AND BEGIN DECOMPRESSION IMMEDIATELY WHEN THE FAVOR AIR SHOWS YOU THAT DECOMPRESSION IS REQUIRED! Note the upward pointing arrow. The ascent time (ASC TIME) is the minimum amount of minutes 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 to reach the surface after the ceiling has been removed. WARNING!
19 YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN DISPLAYED BY THE FAVOR AIR The ascent time will increase if you: - remain at depth, - ascend slower than 10 m/min [33 ft/min], or - make your decompression stop deeper than at the ceiling. These factors will also increase the amount of air required to reach the surface. WARNING! NEVER ASCEND ABOVE THE CEILING! You must not ascend above the ceiling. In order to avoid doing so by accident, you should stay slightly below the ceiling. The ceiling zone is the shallowest depth range to which you should ascend when in decompression. Display Below Ceiling Zone The CEILING/ASC TIME symbol and upwards pointing arrow indicate that you are below the ceiling zone. You should start your ascent immediately. Display At Ceiling Zone When you reach the ceiling zone, the display will show you two arrows pointing toward each other. The two arrows pointing toward each other will be shown between the minimum ceiling and 1.8 m [6 ft] below the minimum ceiling. All decompression stops must be performed at or below the ceiling depth range. The depth of the ceiling will depend on your dive profile. It 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. The ceiling depth will be shown on the left side of the center window. When the sea is rough, it may be difficult to maintain a constant depth near the surface. In this case, it will be more manageable to maintain an additional distance to the ceiling, to make sure that the waves do not lift you above the ceiling. SUUNTO recommends that decompression takes place deeper than 4 m [13 ft], even if the indicated ceiling is shallower. NOTE: It will take more time and more air to decompress below the ceiling than at the ceiling. During decompression, ASC TIME will count down toward zero. When the ceiling moves upwards, you can ascend to the new ceiling. You may surface only when the ascent time reaches zero and CEILING/ASC TIME is replaced by NO DEC TIME.

Display Above Ceiling If you ascend above the ceiling, a downward pointing arrow will appear and a continuous beeping starts. In addition, a blinking error warning Er reminds you that you have only three minutes to correct the situation. You must immediately descend to or below the ceiling. If you continue to violate the decompression requirements, the FAVOR AIR goes into a permanent ERROR MODE. In this mode you must not dive again for at least two days. See also Section 3.7, "Error Conditions". WARNING ! NEVER LET THE CEILING DEPTH DESCEND DEEPER THAN 9 m [30 ft]! When the ceiling is deeper than 9 m [30 ft], a blinking error warning Er will appear and when the 12 m [39 ft] ceiling is reached the FAVOR AIR will go into a permanent error mode. WARNING! ALWAYS COMPARE THE ASCENT TIME TO THE REMAINING AIR TIME AND AIR PRESSURE! It is important that you have sufficient air to make proper decompression stops.
3.5 AT THE SURFACE 3.5.1 Surface Interval An ascent to any depth shallower than 1.8 m [6 ft] will cause the DIVING display to be replaced by the two SURFACE displays, giving the following information: Display I - The surface time in hours and minutes (separated by a colon), telling the duration of the present surface interval. It is shown above SURF TIME in the center window of the display. - The dive time in minutes, i.e. the total duration of the most recent dive, is displayed next to DIVE TIME in the lower left corner. - The maximum depth of your most recent dive in meters [ft] is shown in the same position as your depth readings during the dive. The MAX indicator is then shown next to the value. The SLOW warning will blink over the maximum depth, if you have surfaced with the SLOW warning on. - The no-flying warning is indicated by a blinking airplane. - The present cylinder pressure in bars [psi]. Display II - The present depth in meters [ft].
21 - The desaturation/no-flying time in hours and minutes is shown next to the non-blinking airplane in the center window of the display. - The temperature in C [ F] is shown in the lower left corner. - The present cylinder pressure in bars [psi]. If you start a new dive after less than 10 minutes at the surface, the FAVOR AIR interprets this as a continuation of the previous dive. The DIVING display will return, the DIVE number will remain unchanged, and DIVE TIME will continue from where it left off. After 10 minutes on the surface, subsequent dives are by definition repetitive. The DIVE counter displayed in the dive planning mode will progress to the next higher number if you make another dive after 10 minutes of surface interval time. Dive Planning You may, at any time on the surface, enter the DIVE PLANNING mode in the manner described in Section 3.3.2, by touching the PLAN/ON and COM contacts. The FAVOR AIR will take into account the residual nitrogen caused by your previous dives. The no-decompression times given for different depths will therefore be shorter than before your first dive. You may also read the time by touching the TIME/MODE and COM contacts, as described in Section 3.3.3.

3.5.2 Flying After Diving The no-flying time is shown in the center window next to the non-blinking airplane image. The blinking airplane is a reminder, when the alternative display showing surface time is on. Flying or traveling to a higher altitude should be avoided anytime the airplane symbol is displayed. The no-flying time displayed by the FAVOR AIR is always at least 12 hours or equivalent to the so-called desaturation time (if longer than 12 hours). When this time has elapsed, the residual nitrogen is no longer a factor for subsequent dives. At this time the FAVOR AIR will automatically deactivate itself. In the permanent ERROR mode the no-flying time displayed is 39 hours 59 minutes. Flying or traveling to a higher altitude after a dive may significantly increase the risk of decompression sickness. WARNING! YOU ARE ADVISED TO AVOID FLYING ANY TIME THE COMPUTER DISPLAYS THE
22 DO NOT FLY WARNING, INDICATED BY AN AIRPLANE! Further, the Divers Alert Network (DAN) advises as follows: - 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 2400 m [8000 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 flight. Further, the Undersea and Hyperbaric Medical Society (UHMS) suggests divers using standard air tanks and exhibiting no symptoms of decompression sickness wait 24 hours after their last dive to fly in an aircraft with cabin pressure up to 2400 m [8,000 ft]. The only two exceptions to this recommendation are: - If a diver had less than 2 hours total accumulated dive time in the last 48 hours, then a 12 hour surface interval before flying is recommended. - Following any dive that required a decompression stop, flying should be delayed for at least 24 hours, and if possible, for 48 hours. Suunto recommends that flying be avoided until all the DAN and UHMS guidelines and the FAVOR AIR wait to fly conditions are satisfied. WARNING! THERE CAN NEVER BE A FLYING AFTER DIVING RULE THAT IS GUARANTEED TO PREVENT DECOMPRESSION SICKNESS COMPLETELY! 3.6 PERSONAL ADJUSTMENT AND HIGH ALTITUDE DIVES The FAVOR AIR can be adjusted for increasing the conservatism of the mathematical model or for diving at altitude. WARNING! SET THE CORRECT PERSONAL/ALTITUDE ADJUSTMENT MODE! When diving at altitudes greater than 700 m [2300 ft] the personal/altitude adjustment feature must be correctly selected in order for the computer to calculate the no-decompression status. The diver should also use this option to make the calculations more conservative, whenever it is believed that factors which tend to increase the possibility of decompression sickness exist. Failure to properly select the personal/altitude adjustment mode correctly will result in erroneous data and can greatly increase the risk of decompression sickness. WARNING! THE FAVOR AIR IS NOT INTENDED FOR USE AT ALTITUDES GREATER THAN 2400 m (8000 ft)! Traveling to a higher elevation can temporarily cause a change in the equilibrium of dissolved nitrogen in the body with the surroundings. It is recommended that the diver allow the body conditions to stabilize over a period of at least three hours before beginning to dive at altitude.

23 Altitude Adjustability When programming the FAVOR AIR for the correct altitude, the diver needs to select the correct altitude mode according to Table 3.2. As a result the FAVOR AIR adjusts its mathematical model according to the entered altitude, giving shorter no-decompression times at higher altitudes (Tables 6.1 and 6.2). The entered personal/altitude adjustment mode is indicated by A0, A1, or A2. Section 4.3, Personal/altitude Adjustment Setting describes how the altitude mode is adjusted. Table 3.2 Altitude ranges. Altitude mode Altitude range A- 700 m [0 - 2300 ft] A- 1500 m [2300 - 5000 ft] A- 2400 m [5000 - 8000 ft] Personal Adjustability The factors, which tend to increase the possibility of decompression sickness, include but are not limited to: - cold exposure - water temperature less than 20 C [68 F] - the diver is below average physical fitness level - multiday or repetitive dive exposure - diver fatigue - dehydrated conditions - previous history of decompression sickness This feature should be used to adjust the computer to intentionally introduce a factor to make it more conservative according to personal preference by entering a higher altitude mode than required in table 3.2 (i.e. diving at sea level with the personal/altitude adjustment set at A1 or A2). The no-decompression limits are then shortened accordingly (Tables 6.1 and 6.2).
3.7 ERROR CONDITIONS The FAVOR AIR is provided with warning indicators that advise the user to react to certain situations that would otherwise give rise to a significantly increased risk of decompression sickness if left unattended. If you do not respond to its warnings, it will enter a permanent ERROR MODE, indicating that the risk of decompression sickness has greatly increased. If you understand and operate the FAVOR AIR sensibly, it is unlikely that you will ever put the FAVOR AIR into the ERROR MODE. The permanent ERROR MODE is shown by a non-blinking Er in the center display. Once in ERROR MODE, the FAVOR AIR will continue to display current depth and dive time. You should immediately ascend to a depth of 3 to 6 m [10 to 20 ft] and remain at

26 - downward pointing arrow if the ceiling was violated - Er in the center window, if the ceiling was permanently (over 3 min) violated or if the 12 m [39 ft] ceiling was reached or if the ASC TIME was over 63 min. DISPLAY II: - average depth - surface interval time before dive - temperature at the maximum depth DISPLAY III: - dive entry time and date The data of the most recent dive is shown first as DIVE 1 (the first dive in the memory). Next preceding dives are recalled by touching the TIME/MODE and COM contacts. A brief touch of the contact will bring you to the preceding dive (DIVE 2), continuous contact scrolls through the preceding dives (DIVE 3,. DIVE 9, DIVE 1 again etc.). Only DISPLAY I is shown, while scrolling the dives. The desired dive is selected by breaking the contact when that dive appears on the display. The dives can be scrolled backwards by touching the PLAN/ON and COM contacts. When new dives are added after nine dives, the oldest dives are deleted. The memory will always retain the nine most recent dives. The contents of the memory will remain even when the battery is changed (assuming that the replacement has been done according to the instructions). NOTE: Dives shorter than one minute are not registered. NOTE: The dive numbers shown in the dive planning mode do not match with the ones shown in the logbook. In the dive planning mode the dives are numbered according subsequent repetitive dives within a dive series, whereas in the logbook the dives are numbered according to memory address. NOTE: The logbook contains test dives made in the factory. These dives will be deleted after you have performed nine dives.
Fig 4.2 LOGBOOK, DISPLAY I This display will alternate with DISPLAYS II and III. The maximum depth of the second recent dive was 28.6 m [94 ft] and the total dive time 29 min. The personal/altitude adjustment mode was set to A1 and the minimum nodecompression time during the dive was 3 minutes. 4.2 DIVE HISTORY MEMORY
27 The Dive History is activated by touching the TIME/MODE and COM contacts until HIS appears. This mode will show: - the maximum depth ever reached - the total number of dives - the total accumulated dive time in hours 999 dives and 999 hours of diving can be registered. When these maximum values are reached, the counters will start again from 0. NOTE: The maximum depth will be zeroed, if the depth of 97.6 m [320 ft] is exceeded. NOTE: The dive and dive time counters in the History Memory contain some test dives made in the factory (e.g. DIVE 2, DIVE TIME 1 h). The maximum depth is, however, zeroed.
4.3 PERSONAL/ALTITUDE ADJUSTMENT SETTING The current personal/altitude adjustment mode is shown when diving as well as on the surface display. If the mode does not match the altitude or conditions (see Chapter 3.6), it is imperative that the diver enter the correct selection before diving. The new personal/altitude adjustment setting is entered in the following way. In these figures the contacts which are connected are highlighted. 1. Activate the personal/altitude adjustment setting mode by connecting the TIME/MODE and COM contacts continuously. Release your fingers immediately when Alt is pointed on the display. Within a couple of seconds the present personal/altitude adjustment setting is shown. 2. Connect the PLAN/ON and COM contacts until all three personal/altitude adjustment modes appear. Release your fingers immediately at this point. The current mode is now blinking. Wait at least two seconds but not more than four seconds before the next step. 3. Connect again the PLAN/ON and COM contacts until the blinking personal/altitude adjustment mode starts to scroll. Release your fingers when the desired mode is blinking. Wait at least two seconds but not more than four seconds before the next step. 4. Connect the TIME/MODE and COM contacts to confirm this new personal/altitude adjustment mode. The blinking will stop and the other mode indicators will disappear. 5. The process is ended by the RETURN command, i.e. by connecting all three contacts at the same time. The FAVOR AIR will return to the surface mode. WARNING! ALWAYS RECHECK THE PERSONAL/ALTITUDE ADJUSTMENT SETTING TO ENSURE THAT IT IS NOT SET FOR AN ALTITUDE LESS THAN THAT OF THE DIVE

28 SITE! 4.4 TIME AND DATE SETTING The current date and time is read by connecting the TIME/MODE and COM contacts for about two seconds, as described in Section 3.3.3, "Calendar Clock Function". Once the Time Setting mode is activated the principle when adjusting the clock is that: - the TIME/MODE and COM contacts scroll through the different displays, - the PLAN/ON and COM contacts change the values of the selected display. In these figures the contacts which are connected are highlighted. Thus, to set the time, do as follows: 1. Activate the Time Setting mode by connecting the TIME/MODE and COM contacts continuously to scroll through the menu. Release your fingers immediately when Set appears on the display. The Time Setting display will now be shown. 2. The hour display starts to blink immediately. If you want to change it, keep the PLAN/ON and COM contacts connected. The hours will start to scroll. Release your fingers immediately when the correct value is displayed. [To change the A or P for a.m. or p.m. scroll the hours past 12:00]. 3. To scroll through the minutes, month and date, keep the TIME/MODE and COM contacts connected. Release your fingers when the display you wish to change is blinking. Repeat step 2 to change this value. NOTE: In case of the minutes and date, the change is made separately for both digits, as shown by the blinking digit. In case of the hours and month, the complete number is changed simultaneously. 4. Repeat steps 2 and 3 to change any additional values. 5. Exit the Time Setting mode with the RETURN command, i.e. by connecting all three contacts at the same time. First make contact between the PLAN/ON and TIME/MODE contacts and after that with the COM contact. NOTE: The clock is on (time is elapsing) when setting it and exiting the Time Setting mode. It is not possible to reset the seconds. Remember to regularly check that the clock is on time especially when traveling to different time zones, as the entry time of all dives is stored in the logbook memory. 5. CARE AND MAINTENANCE
29 The FAVOR AIR dive computer is a sophisticated precision instrument. Remember to treat it as such! It has been designed to withstand the rigors of scuba diving. It has a rigid housing, installed in a durable thermoplastic console boot and its display is protected by a replaceable display shield. The user should wash and rinse the unit in fresh water after every use. Protect it from shocks, extreme heat or direct sunlight and chemical attack. The FAVOR AIR cannot withstand the impact of heavy objects like scuba cylinders, nor chemicals like acetone and alcohols (ethanol, isopropanol). NOTE: Keep the water contacts clean to assure correct operation of the FAVOR AIR. Store the FAVOR AIR in a dry place. NOTE: Frequently check the battery compartment for moisture through the transparent battery cover of the FAVOR AIR, especially after battery replacement. The FAVOR AIR should be serviced every two years or after 200 dives (whichever comes first) by an authorized dealer. This service will include a general operational check and battery replacement. The service requires special tools and training. Therefore, it is advisable to contact an authorized Suunto dealer for biennial service. Do not attempt to do any servicing that you are not trained for. The FAVOR AIR will display a battery symbol as a warning when the power gets too low. When this happens, the FAVOR AIR should not be used until the battery has been replaced (see also chapter 3.3.1/Battery warning). 5.1 MAINTENANCE If left without care for an extended period, a thin film (often invisible to the eye) will cover the unit. Much like the buildup on the glass of an aquarium, this film is the result of organic contaminates found in both salt and fresh water. Suntan oil, silicone spray and grease will speed up this process. As a result of this buildup, moisture could be trapped next to the contacts and may not allow your FAVOR AIR to operate properly. The water contacts can be cleaned with a soft pencil eraser. IMPORTANT: The FAVOR AIR should be soaked, then thoroughly rinsed with fresh water after each dive. Make sure that all salt crystals and sand particles have been flushed out of the console. At the end of a dive trip, the FAVOR AIR should be rinsed thoroughly and then dried with a soft towel. The computer unit will periodically need to be removed from the console boot and cleaned before storage. IMPORTANT: When removing the computer from the console, check the battery compartment for possible moisture or water. This is easily done through the transparent

30 lid covering the compartment. DO NOT use the FAVOR AIR if you detect any moisture or water inside. CAUTION! - do not use compressed air to blow water off the unit - do not use solvents or other cleaning fluids that might cause damage - do not test or use the FAVOR AIR in pressurized air. 5.2 ASSEMBLY AND DISASSEMBLY
The FAVOR AIR can be disassembled. This needs to be done partly or completely when: - adding or removing the compass unit - cleaning or replacing the display shield - cleaning the unit thoroughly - replacing the regulator hose - replacing the battery. Compass Unit, Display Shield or Replacement of the Battery 1. 2. 3. 4. 5. Unscrew the two screws at the bottom of the unit. Pull out the crossbar. Remove or install the display shield, the compass module or the rear cover for battery replacement (see chapter 5.3 for battery replacement). Refit the crossbar. Fasten the two screws.
Compass Module The compass module itself is mounted very tightly into the boot and it should preferably not be removed. If necessary, bring the console to an authorized dealer. Computer Removal This needs to be done for cleaning the inside of the console or for replacing the hose: 1. 2. 3. 4. 5. 6. Remove the crossbar as described above. Pull out the compass module, if fitted. Lift out the display shield. Open the rear cover. Carefully remove the computer by pressing at the top edge of the front side of the FAVOR AIR. DO NOT press on the LCD display itself (see chapter 5.1 for cleaning the console). Reassemble the FAVOR AIR by carrying out the above steps in reverse order.
31 Ensure that the console fits properly into the console before assembling the rear cover. 5.3 BATTERY REPLACEMENT
NOTE: It is advisable to contact an authorized Suunto dealer 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. Do not attempt to open the FAVOR AIR before reading this entire set of instructions. CAUTION! DEFECTS CAUSED BY IMPROPER BATTERY INSTALLATION ARE NOT COVERED BY THE WARRANTY! CAUTION! WHEN THE BATTERY IS CHANGED, ALL NITROGEN UPTAKE IS LOST! The FAVOR AIR must therefore have turned itself off before battery change or you must wait for 48 hours between dives before you may dive again. All history and logbook data will remain in the FAVOR AIR memory after the battery change. When working with the battery compartment, cleanliness is extremely important. Even the smallest piece of dirt may cause a leakage when you dive. When battery replacement is needed See chapter 3.3.1 Activation, Prechecks and Battery Warning

ring is not at any point protruding out on the edge. 14. Put your other thumb through the locking ring with the "ribs" facing the hand. Press this thumb firmly against the lid and release the other one. Make sure that the lid is pressed down completely! 15. Turn the locking ring clockwise with your free thumb and fingers until it snaps into its locked position. CAUTION! MAKE SURE THAT THE LID IS COMPLETELY PRESSED DOWN WHEN TURNING THE LOCKING RING! The battery compartment hooks may get seriously damaged if the locking ring is used to press the lid down. 16. Push the FAVOR AIR back into the console and reassemble the display shield, cross bar and screws. 17. Set the correct time and date (and personal adjustment/altitude mode, if necessary). The FAVOR AIR is now ready for use.
CAUTION ! AFTER THE FIRST DIVE CHECK FOR POSSIBLE MOISTURE UNDER THE TRANSPARENT BATTERY COMPARTMENT LID, WHICH WOULD INDICATE A LEAK! This can easily be done looking through the triangular holes in the back of the console.
5.4 BATTERY COMPARTMENT INSPECTION Frequently check the battery compartment for moisture through the transparent battery cover of the FAVOR AIR. This is important especially after the battery has been replaced. If you find moisture inside the transparent battery compartment lid, there is a leak. DO NOT use the FAVOR AIR if you detect any moisture or water inside. A leak must be corrected without delay, as moisture will seriously damage the computer, even beyond repair. Suunto does not take any responsibility for damage caused by moisture in the battery compartment, if the instructions of this manual are not carefully followed. In case of a leak immediately bring the FAVOR AIR to an authorized Suunto dealer/distributor. 6. TECHNICAL DESCRIPTION 6.1 OPERATING PRINCIPLES The Suunto FAVOR AIR is a multi-functional sport diving instrument, which provides information on depths, times and decompression requirements. Its electronic microprocessor mathematically models the absorption and release of nitrogen during all phases of diving, including ascents, surface intervals and repetitive dives. WARNING! DO NOT ATTEMPT TO USE THE FAVOR AIR WITHOUT FIRST READING THE
34 ENTIRE OWNER'S MANUAL! The FAVOR AIR must be activated before diving and operated correctly to provide accurate and correct information. No-Decompression Limits The no-decompression limits displayed by the FAVOR AIR upon activation are for most dives to a single depth slightly more conservative than those permitted by the U.S. Navy tables, Tables 6.1-2. TABLE 6.1 NO-DECOMPRESSION TIME LIMITS (min) FOR VARIOUS DEPTHS [m] FOR THE FIRST DIVE OF A SERIES Personal/high altitude adjustment mode Depth [m] A0 A1 A--- 8 6
Table 6.2 NO-DECOMPRESSION TIME LIMITS (min) FOR VARIOUS DEPTHS [ft] FOR THE FIRST DIVE OF A SERIES Personal/high altitude adjustment mode Depth [ft] A0 A1 A2 U.S. Navy 30 ----6 10

Unlike the U.S. Navy tables, the FAVOR AIR interpolates between depths, giving a diver "credit" for time spent in shallower water, rather than calculating no-decompression limits based on the maximum depth of a dive. As a result, multi-level no-decompression dive times permitted by the FAVOR AIR are often longer than those that would be allowed by the U.S. Navy tables. WARNING! THE USER SHOULD BE AWARE THAT ANY DIVE, INCLUDING ONES WITHIN THE U.S. NAVY TABLES OR THE FAVOR AIR LIMITS, DOES CARRY SOME RISK OF DECOMPRESSION SICKNESS! Compartments and Half Times When you dive with the FAVOR AIR, it measures and displays depths and times as your dive progresses. It shows you available no-decompression time and possible decompression required based upon the following five factors: 1. your present depth, 2. excess nitrogen absorbed during earlier portions of the dive, 3. residual nitrogen remaining from previous dives, 4. the no-decompression limits that apply to that depth, 5. the personal/altitude adjustment mode in use. Back on the surface, the FAVOR AIR will continue to calculate the no-decompression dive times available for various depths on the next dive. As the surface interval increases, so does the available dive time for the next dive. To perform these calculations, the FAVOR AIR continuously models the absorption and release of excess nitrogen from theoretical compartments. Each compartment absorbs and releases nitrogen at a different rate. The compartments that absorb and release nitrogen rapidly are believed to have a high tolerance for excess nitrogen, whereas compartments that absorb and release nitrogen more slowly are believed to be more sensitive. The no-decompression limits in the U.S. Navy tables are based upon six theoretical compartments for single dives, and one compartment for surface intervals and repetitive dives. If you are familiar with table theory, you may know that they are characterized by half times (i.e. the time required for 50 % equilibration to a pressure change) ranging from 5 minutes to 120 minutes. The FAVOR AIR includes the same six compartments, and two additional compartments for an increased range of the mathematical model. The calculations are based on all eight compartments for all phases of diving, including surface intervals and repetitive dives. The FAVOR AIR's half times range from 2.5 to 320 minutes. The multilevel tissue calculations are based on the modified Haldanean principle incorporating
36 the Doppler meter silent microbubble research done by Dr. Spencer. Altitude Diving The atmospheric pressure is lower at high altitudes than at sea level. After traveling to a higher altitude, the diver will have additional nitrogen in his body, compared to the equilibrium situation at the original altitude. This "additional" nitrogen is released gradually in time and equilibrium is reached within a couple of days. Before high altitude diving the FAVOR AIR must be set to high altitude diving mode to take this into account. The maximum partial pressures of nitrogen allowed by the mathematical model of the FAVOR AIR are reduced according to the lower ambient pressure. As a result the allowed no-decompression limits are considerably reduced. Surface Intervals The FAVOR AIR requires a minimum surface interval of 10 minutes between dives. If a surface interval is shorter than 10 minutes, the FAVOR AIR dive counter and dive timer treat the next dive as a continuation of the previous dive. It adds the dive times, and calculates no-decompression limits or decompression stops based on excess nitrogen absorbed on both dives. In this regard, it is similar to the U.S. Navy tables. Depth Limits WARNING! SUUNTO STRONGLY RECOMMENDS THAT SPORT DIVERS LIMIT THEIR MAXIMUM DEPTH TO 40 m [130 ft]! However, the FAVOR AIR will calculate below that depth to provide a wide margin of flexibility if, through carelessness or emergency, you are forced to exceed this recommended depth limit for a dive. 6.2 TECHNICAL SPECIFICATION Dimensions and weight: Length: 145 mm [5.7 in] (without hose) Width: 72 mm [2.8 in] Depth: 46 mm [1.8 in] Weight: 310 g [0.23 lb] (without hose and compass module) Depth Gauge: Temperature compensated pressure sensor Salt water calibrated (in fresh water the readings are about 3% smaller) Depth display range: 0 to 90 m [295 ft]