Fig. 2.2. Push buttons of the dive computer. Fig. 2.1. Time keeping display. Pressing PLAN or TIME button activates display.

2.2. PUSH BUTTONS

The dive computer has easy-to-use push buttons and an advisory display, which guides the user. The SMART (MODE) button is the key to the system. The two scroll buttons, PLAN and TIME, are used for scrolling up and down the menus and to show the alternative displays. The dive computer is controlled with these three push buttons as follows (see Fig. 2.2.).
Fig 2.3. Depth sensor (A), water/data transfer contacts (B).
Press the SMART (MODE) button To activate the dive computer. To change from the Surface Mode to the menu based modes. To select, conrm or quit a submode (short press). To immediately exit any submode to the Surface Mode (long press). To activate the electroluminescent backlight (in the Surface Mode hold down the mode button for more than two (2) seconds, during a dive for one (1) second). To activate the gas change mode during a dive hold down the mode button for more than two (2) seconds. Press the arrow up scroll (PLAN) button To activate the timekeeping display, if the display is blank. To activate the Dive Planning in the Surface Mode. To make a special bookmark in the prole memory during a dive. To scroll up the options (s, increase). Press the arrow down scroll (ALTER) button To activate the timekeeping display, if the display is blank. To activate the alternative display(s). To scroll down the options (t, decrease). The dive computer is controlled with the SMART (MODE/On/Backlight// Select/OK/Quit) and the s PLAN and TIME t push buttons and with the water contacts as follows: Activation Dive Planning Menu Modes press the SMART (On) button or immerse the instrument in water for ve (5) seconds. in the Surface Mode, press the PLAN (s) button. press the SMART (MODE) -button.
The display is illuminated in surface mode by holding down the SMART button for more than two seconds.

2.3. WATER CONTACTS

The water contacts control the automatic activation of the Dive Mode. The water and data transfer contacts are located on bottom of the case (Fig 2.3). When submerged the water contacts are connected to the push buttons (which are the other pole of the water contact) by the conductivity of the water. The AC text (Active Contacts, Fig. 2.4.) will appear on display. The AC text will be shown until the water contact deactivates or the dive computer enters the Dive Mode automatically.
2.4. WIRELESS CYLINDER PRESSURE TRANSMISSION
The Vytec can be used together with an optional wireless cylinder pressure transmitter that can easily be attached to the high-pressure port of the regulator (Fig. 2.5). By using the transmitter the diver can benet from cylinder pressure and remaining air time data. In order to use the transmitter the wireless integration needs to be enabled in the Vytecs settings. To enable or disable the wireless integration refer to chapter 4.3.3.3 Cylinder pressure settings.

WARNING:

In case there are several divers using Vytecs with wireless transmission always ensure that all divers are on different codes before starting the dive.
The selected transmission code can later be veried via the alternative display, by pressing the TIME button twice. If needed, the stored code can be manually erased in this display by pressing the PLAN (up) button and then pressing MODE (select). The Vytec will now erase the stored code and start displaying SETC allowing a new pairing with the transmitter. The alternative display showing the selected code reverts to the main display after 15 seconds in order to avoid accidental code changes. The user can manually change the transmitters code by reducing the pressure to less than 10 bar [145 psi] and then immediately (within 10-12s) increasing the pressure above 15 bar [220 psi]. The transmitter will now select a new code. The wrist unit must be in SETC mode to pair on the new code. This procedure can be used e.g. if your dive buddy has the same code and you need to change the code. NOTE: In order to save battery energy the transmitter shuts off if the pressure remains unchanged for more than 5 minutes and it will continue transmitting with the saved code when any pressure change is measured.

DIVE TIME

2.4.3. Transmission Data
Fig 2.6. Pressure transmission related displays.
After the pairing procedure the Vytec will receive cylinder pressure data from the transmitter. The pressure is displayed in either bars or psi depending on the unit selection. Any time the Vytec receives an appropriate signal it ashes the lightning gure in the displays lower left corner. A pressure reading of over 360 bar [5220 psi] will display as --- (Fig. 2.6 b). If the Vytec is unable to receive a valid signal for more than one minute it will start displaying FAIL intermittently with the latest valid pressure reading (Fig. 2.6 c).
In case the transmitter battery is running low, a low battery warning LOBT will be transmitted and displayed intermittently with the pressure reading on the Vytec (Fig.2.6 d). If the dive is started without that the Vytec and the transmitter have been properly paired, the Vytec will indicate that no cylinder data is available by displaying OFF (Fig. 2.6 e).

Fig 3.3. Startup III. Surface mode. Depth and dive time are zero and cylinder pressure is 300 bar [4350 psi]. Pressing TIME button activates alternative display of temperature and current time.
IIf the optional wireless pressure trans-mitter is used (see chapter 2.4. Wireless pressure transmission) ensure that: the pressure transmitter has beenproperly attached and that the cylinder valve is open the transmitter and the wrist unit have been properly paired on a suitable code the pressure transmitter is working (lightning symbol blinks, cylinderpressure is displayed), and that there is no low battery warningdisplayed you have enough air for your planneddive. You should also check the pressure reading against your back-up pressure gauge. And if set to Nitrox mode (refer to chapter 3.4 Diving in Nitrox mode), make sure that: the correct number of mixes are set and that the oxygen percentages are adjusted according to the measured Nitrox blends in your cylinders the oxygen partial pressure limits are set correctly. The dive computer is now ready for diving.
Fig. 3.4. Startup IV. Gauge mode.
3.1.2. Battery Indication
Fig. 3.5. Low Battery Warning. Battery symbol indicates that the battery is low and battery replacement is recommended.
3.1.2.1. Battery Power Indicator
This dive computer has a unique graphic Battery Power Indicator designed to give you an advance notice of impending need to change the battery.
The Battery Power Indicator can always be seen when the Dive Mode is activated. The electroluminescent backlight will be on during the battery check. The following Table and Figure show the various warning levels. TABLE 3.1. BATTERY POWER INDICATOR
Display BAT + 4 segments + OK BAT + 3 segments Operation Normal, full battery. Normal, battery power is getting low or the temperature is low. Battery replacement is recommended, if you are going to colder conditions or if you are planning to make a dive trip. LOWBAT + 2 segments + low battery symbol Battery power is low and the battery replacement is recommended. The battery symbol is displayed. The backlight is disabled. LOWBAT + 1 segment + QUIT+ low battery symbol Figure 3.2 a
Change the battery! Returns to the Time display. Activation and all functions are disabled.
Temperature or an internal oxidation of the battery affects the battery voltage. If the instrument is stored for a long period, the low battery warning may be displayed even though the battery has enough capacity. The low battery warning may also be displayed at low temperatures, even though the battery has enough capacity in warmer conditions. In these cases repeat the battery check procedure. After battery check the Low Battery Warning is indicated by the battery symbol (Fig. 3.5.).
Fig. 3.6. Dive Planning. Planning mode is indicated by PLAN text. Nodecompression time limit at 30.0 m [100 ft] is 14 minutes in A0/P1 mode.
If the battery symbol is displayed in the Surface mode or if the display is faded or weak, the battery may be too low to operate the dive computer and battery replacement is recommended. NOTE! For safety reasons the backlight cannot be activated when the low battery warning is indicated by the battery symbol.

the Personal Adjustment setting on the left side of the center window with a diver symbol and + signs (P0, P1, or P2) (see Table 3.5.) the Diver Attention Symbol if attenuated RGBM has been set (see Table 3.3.) blinking Diver Attention Symbol if surface interval should be prolonged (see Table 3.3.)
Fig. 3.10. Bookmark In addition with the optional wireless transmisactivation. An annotation, sion enabled: Bookmark, is placed in the prole memory during the Remaining Air-time in the left a dive by pressing PLAN center window button. Note the Logbook the cylinder pressure in bar [or psi] symbol.
displayed in the lower left corner

MAX STOP

Alternative displays by pressing the TIME button (Fig. 3.9.): the current time, shown as TIME the water temperature in C [F] NOTE! In Dive Mode the alternative display switches back to the main display after 5 seconds.

3.3.2. Bookmark

Fig. 3.11. A three minute Recommended Safety Stop.
It is possible to make special marks in the prole memory during a dive. These Bookmarks will be shown as a dive log symbol when scrolling the prole memory on the computer display. The Bookmarks will also be shown as annotations in the PC-software, Suunto Dive Manager. To make a bookmark on the prole memory during a dive press the PLAN button (Fig. 3.10.).
3.3.3. Cylinder Pressure Data
When using the optional wireless pressure transmitter the pressure of your scuba cylinder in bars [psi] will be shown digitally in the lower left 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 rst estimation of remaining air time will be
Fig. 3.12. Cylinder pressure warnings. Pressure has dropped below 50 bar [725 psi]. Pressure display is blinking and there is an audible alarm.
shown in the left center window of the display. The calculation is always based on the actual pressure drop in your cylinder and will automatically adapt to your cylinder size and current air consumption. The change in your air consumption will be based on constant one second interval pressure measurements over 30 - 60 second periods. An increase in air consumption will inuence 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 remaining air time calculation includes a 35 bar [500 psi] safety reserve. This means that when the instrument shows the air time to be zero, there is still about 35 bar [500 psi] 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! Filling your BC will affect the air time calculation, due to the temporary increase in air consumption. NOTE! A change of temperature will affect the cylinder pressure and consequently the air time calculation. Low Air Pressure Warnings The dive computer will warn you with three audible double beeps and a blinking pressure display when the cylinder pressure reaches 50 bar [725 psi] (Fig. 3.12.). Three double beeps are also heard when the cylinder pressure goes down to the user selected alarm pressure and when the remaining air time reaches zero.

3.3.4. Consumed Bottom Time (CBT)
The available no-decompression stop time is also shown visually in the multi-function bar graph on the left side of the display (Fig. 3.7., 3.8. and 3.9.). When your available no-decompression time decreases below 200 minutes, the rst (lowest) bar graph segment appears. As your body absorbs more nitrogen, more segments start to appear. White Zone - As a safety precaution Suunto recommends you should maintain the no-decompression bar graph within the white zone. Segments start to appear when the available no-decompression time decreases below 100, 80, 60, 50, 40, 30 and 20 minutes. Gray Zone- As the bars reach the gray zone, your no-decompression stop time is less than 10 or 5 minutes and you are getting very close to no-decompression limits. At this point, you should start your ascent towards the surface.
Red Zone As all of the bars appear (red zone), your no-decompression stop time has become zero and your dive has become a decompression stop dive (for more information see section 3.3.6. Decompression dives).
3.3.5. Ascent Rate Indicator
The ascent rate is shown graphically along the right side of the display as follows: TABLE 3.2. ASCENT RATE INDICATOR
Ascent Rate Indicator No segments One segment Two segments Three segments Four segments Four segments, the SLOW segment, blinking depth reading, the STOP sign and an audible alarm The equivalent ascent speed Below 4 m/min [13 ft/min] 4 - 6 m/min [ft/min] 6 - 8 m/min [ft/min] 8 - 10 m/min [ft/min] 10 - 12 m/min [ft/min] Above 12 m/min [39 ft/min] or continuously above 10 m/min [33 ft/min] Example in Fig. 3.8 3.9 3.10 3.11 3.12
When the maximum allowed ascent rate is exceeded, the fth SLOW warning segment and the STOP sign appear and the depth reading starts to blink, indicating that the maximum ascent rate has been exceeded continuously or that the current ascent rate is signicantly above the allowed rate. Whenever the SLOW warning segment and the STOP sign appear (Fig. 3.13.), you should immediately slow down your ascent. When you reach the depth zone between 6 m to 3 m [20 ft to 10 ft] the STOP and CEILING depth labels will advise you to make a Mandatory Safety Stop. Wait until the warning disappears (Fig. 3.14.). You should not ascend shallower than 3 m [10 ft] with the Mandatory Safety Stop warning on.

DEFAULT NITROX SETTINGS

In Nitrox mode the Vytec allows the user to set 1-3 nitrox mixes containing 21-99% oxygen. In the Nitrox mode, the default setting for MIX1 is standard air (21% O2). It remains in this setting until the O2% is adjusted to any other percentage of oxygen (22% - 100%). The default setting for maximum oxygen partial pressure is 1.4 bar, however you are able to set it in the range of 0.5 - 1.6 bar. If unused, the computer will retain the manually entered values for the oxygen percentage and maximum oxygen partial pressure for MIX1 for about two hours, after which it will revert to the default settings. MIX2 and MIX3 are by default set to OFF. To set MIX2 and MIX 3 refer to chapter 3.4.4 Gas change and multiple breathing mixes. Oxygen percentages and maximum oxygen partial pressures for MIX2 and MIX3 are stored permanently. If MIX2 and MIX3 are set OFF, the computer will retain the manually entered values for the oxygen percentage and maximum oxygen partial pressure for MIX1 for about two hours, after which it will revert to the default settings.
Fig. 3.19. Decompression dive, above ceiling. Note downward pointing arrow, Er warning and an audible alarm. You should immediately (within 3 minutes) descend to or below ceiling.
CEILING 3m / 10ft 6m / 18ft FLOOR
Fig. 3.20. Ceiling and Floor Zones. The Recommended and Manadatory Safety Stop zone lies between 6m and 3m [20 ft and 10ft].

3.4.2. Oxygen Displays

If set to Nitrox mode the NITROX display, with all labeled oxygen information and the
Fig. 3.21. Nitrox display. Maximum depth based on set O2% (21%) and PO2 (1.4 bar) is 54.1 m [177 ft].
Fig. 3.22. Diving in Nitrox mode. The O2% is set to 32%.
label NITROX, is shown after activation. In Dive Planning mode the Nitrox display shows (Fig. 3.21.): 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 the Dive modes, the oxygen percentage labeled with O2% and the current oxygen toxicity exposure shown with an Oxygen Limit Fraction (OLF) bar graph are shown (Fig. 3.22. and Fig. 3.23.). If the wireless transmission is enabled the O2% is shown until the remaining air time is less than 30 minutes. After this, the remaining air time is displayed in its place. During a dive, the oxygen partial pressure, labeled with PO2, is also shown instead of the maximum depth in the upper right display, if the partial pressure is greater than 1.4 bar or the set value (Fig. 3.24.).

Fig. 3.23. Diving in Nitrox mode. After air time is less than 30 minutes O2% is substituted by Air Time display.
By pressing the TIME button during a nitrox dive, the alternative display appears, which includes (Fig. 3.25.): current time temperature Consumed Bottom Time Fig. 3.24. Oxygen partial maximum depth (during decompressure and OLF displays. pression stop dive). There is an audible alarm as oxygen partial pressure remaining air time when remaining air is greater than 1.4 bar or time is over 30min set value, and/or the OLF oxygen percentage when remaining has reached 80% limit. air time less than 30 min

O2% NO DEC TIME

After ve seconds the display will automatically revert to the original display.
3.4.3. Oxygen Limit Fraction (OLF)
In addition to tracking the divers exposure to nitrogen, the instrument tracks the exposure to oxygen, if set to Nitrox mode. These calculations are treated as entirely separate functions. The dive computer calculates separately for Central Nervous System oxygen toxicity (CNS) and Pulmonary Oxygen toxicity, the latter measured by the addition of Oxygen Toxicity Units (OTU). Both fractions are scaled so that the maximum tolerated exposure for each is expressed as 100%. The Oxygen Limit Fraction (OLF) has 11 segments, each representing 10%. The OLF bar graph displays only the value of the higher of the two calculations. When the OTU value meets and exceeds the CNS value then in addition to displaying its percentage the lowest segment blinks to indicate that the value shown relates to OTU. The oxygen toxicity calculations are based on the factors listed in section 6.3. Oxygen Exposure.
Fig. 3.25. Alternative display. Pressing TIME button displays current time, maximum depth, temperature, CBT and O2%, if Air Time is less than 30 minutes.
Fig. 3.26. The lowest bar graph blinks to indicate that the OLF value shown relates to OTU.
3.4.4. Gas Change, Multiple Breathing Gas Mixes
The Vytec has as a special feature the possibility to set two additional nitrox mixes to be used during the dive. This feature can be activated by setting the MIX2 and/or MIX3 ON and entering other parameters in the same way as on the primary gas (See chapter 4.3.1.4 Nitrox/Oxygen settings). Mix 2 and 3 settings are held until you change them (they will not return to default settings automatically). Cylinder pressure data is available for one wireless transmitter only. A dive is always started with MIX1, during the dive the Vytec lets you change to any enabled mix, which is within the

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] ft]
The entered Altitude Adjustment Mode is indicated by mountain symbols (A0, A1 = one mountain, or A2 = two mountains). Section 4.3.1.1. Altitude Adjustment and Personal Adjustment Setting 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.
3.8.2. 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. For very experienced divers, a two step adjustment for RGBM effect on repetitive dives is available. 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 4.3.1.1. Altitude Adjustment and Personal Adjustment Setting 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).

Fig. 4.18. Selected Dive Simulator mode. Descend by pressing the arrow down (TIME) button and ascend by pressing the arrow up (PLAN) button.
4.2.1. Dive Simulator [1 SIMDIVE]
The Dive Simulator mode is an excellent tool for becoming familiar with the dive computer and planning your dives. Suunto recommends using the dive simulator to run through different dive scenarios. The Dive Simulator will allow you to perform dive proles of your choice and see what the display would look like during an actual dive. This includes basic dive information, as well as audible and visual warnings. Cylinder pressure drop is simulated with a constant, depth dependent consumption. If
Fig. 4.19. Dive Planning Simulator mode. [2 SIMPLAN].
multiple gas mixes are set they will be changed as soon as allowed maximum depth is reached upon ascent and in the order of: MIX1, MIX2 and MIX3 To enter the Dive Simulator mode select MODE- 2 SIMUL- 1 SIMDIVE (Fig. 4.17. and 4.18.).
4.2.2. Dive Planning Simulator [2 SIMPLAN]
The Dive Planning Simulator mode shows you the present no-decompression limits. In this mode, you are also able to add the desired surface interval increment to present surface interval time, which allows you to plan your dives in advance. This mode is also used to add the desired surface intervals for dive simulations. Add the desired surface interval increment to present surface interval by pressing the arrow down (TIME) and arrow up (PLAN) buttons. NOTE! This display is only shown for repetitive dives. To enter the Dive Planning Simulator mode select MODE- 2 SIMUL- 2 SIMPLAN (Fig. 4.19.). NOTE! The Dive Planning Simulator mode is disabled in Gauge mode and in Error mode (see section 3.9. Error Conditions).
Fig. 4.20. Selected Dive Planning Simulator mode. Add desired surface interval increment (to present shown surface interval) by pressing TIME and PLAN buttons. This display is only shown for repetitive dives.
Fig. 4.21. Dive Planning Simulation.

4.3. SET MODES [3 SET]

The Set Modes (Fig. 4.22.) are divided into three submodes for setting the dive-related parameters, time-related parameters and your personal preferences.
Fig. 4.22. Setting Options. [3 SET].
4.3.1. Dive Parameter Settings [1 SET DIVE]
Fig. 4.23. Setting Altitude adjustment. Press scroll buttons to change altitude mode.
To enter the Dive Parameter Setting Mode select MODE- 3 SET- 1 SET DIVE. The Dive Parameter Setting mode has two to four options depending on the dive computer mode. In Gauge mode there are two options, in Air mode three options and in Nitrox mode four options.
4.3.1.1 Altitude Adjustment, Personal Adjustment, RGBM Settings and Safety Stop/ Deep Stop [1 AdJ MODE]
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 3.8. 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. Use the Personal Adjustment to add an extra level of conservatism. For certain divers and diving conditions you may want to set attenuated RGBM mode When this selection is made it is indicated with a continuously displayed Diver Attention Symbol. The options are full RGBM effects (RGB100), and attenuated RGBM (RGB50). The deepstop setting allows the user to choose between traditional safety stops or deep stops. If deep stops are set to OFF, traditional safety stop calculation is used. If set to ON iterative Deepstops will be prompted instead. The length of the individual deepstops can be set to 1 or 2 minutes. To enter the Altitude Adjustment, Personal Adjustment and RGBM effect Setting mode, select MODE- 3 SET- 1 SET DIVE- 1 AdJ MODE.

Complete Strap (V5841) Short Strap with buckle (V 5841) Spring Bar (K5588) Long Strap (K5592)
Securing Ring (V5844) Battery Compartment Lid with buzzer (V5843) O-Ring (K5664) Battery Retainer (V5842) Battery (K5597) Vytec Boot K5534
Fig. 5.1 Instrument parts. The code after the name stands for spare part order number.
Fig. 5.2 Opening of the securing ring.

5.5.2.

Wireless Transmitter Battery Replacement
NOTE! It is advisable to contact an authorized Suunto dealer for transmitter battery replacement. It is imperative that the change is made in a proper manner to avoid any leakage of water into the transmitter.
The transmitter battery kit includes a 3.0 V CR AA lithium cell battery and a lubricated O-ring. When handling the battery do not make contact with both of the poles at the same time. Do not touch the metal surfaces of the battery with your bare ngers. TOOLS REQUIRED A Phillips head screwdriver Soft cloth for cleaning.
TRANSMITTER BATTERY REPLACEMENT To change the transmitter battery, follow the procedure below: 1. 2. 3. 4. 5. Remove the transmitter from the regulator HP port Unscrew and remove the four Phillips screws on the back of the transmitter Pull off the transmitter cover Carefully remove the o-ring. Be careful not to damage the sealing surfaces. Carefully remove the battery. Do not touch the electrical contacts or the circuit board
Check for any traces of ooding, or for any other damage. In case of a leak or any other damage, bring the transmitter to an authorized SUUNTO dealer or distributor for check and repair. 6. Check the condition of the O-ring; a defective O-ring may indicate sealing or other problems. Dispose the old O-ring, even if it seems to be in good condition. Check that the o-ring groove and the sealing surface of the cover the are clean. Clean with soft cloth if necessary. Gently insert the new battery in the battery compartment. Check the polarity of the battery: the + mark should point toward the top of the compartment and the - mark towards the bottom.

6.2. SUUNTO REDUCED GRADIENT BUBBLE MODEL (RGBM)
The Suunto Reduced Gradient Bubble Model (RGBM) is a modern algorithm for predicting both dissolved and free gas in the tissues and blood of divers. It was developed in a co-operation between Suunto and Bruce R. Wienke BSc, MSc. PhD. It is based on both laboratory experiments and diving data, including data from DAN. It is a signicant advance on the classical Haldane models, which do not predict free gas (microbubbles). The advantage of Suunto RGBM is additional safety through its ability to adapt to a wide variety of situations. Suunto RGBM addresses a number of diving circumstances outside the range of just dissolved gas models by: Monitoring continuous multiday diving Computing closely spaced repetitive diving Reacting to a dive deeper than the previous dive Adapting for rapid ascents which produce high micro-bubble (silent-bubble) build-up Incorporating consistency with real physical laws for gas kinetics. Suunto RGBM Adaptive decompression The SUUNTO RGBM algorithm adapts its predictions of both the effects of micro-bubble build-up and adverse dive proles in the current dive series. It will also change these calculations according to the personal adjustment you select. The pattern and speed of decompression at the surface is adjusted according to micro-bubble inuence.
Also on repetitive dives adjustment may be applied to the maximum allowable nitrogen overpressure in each theoretical tissue group. Depending on circumstances Suunto RGBM will adapt the decompression obligations by doing any or all of the following: Reducing no-decompression stop dive times Adding Mandatory Safety Stops Increasing decompression stop times Advising an extended surface interval (Diver Attention symbol). Diver Attention Symbol Advice to Extend Surface Interval. If attenuated RGBM (RGB50) has been set, the Diver Attention Symbol will also be shown to indicate it. Some patterns of diving cumulatively add a higher risk of DCI, e.g. dives with short surface intervals, repetitive dives deeper than earlier ones, multiple ascents, substantial multiday diving. When this is detected in addition to adapting the decompression algorithm the Suunto RGBM model will in some circumstances also advise, with the Diver Attention Symbol (review chapter 3.6) that the diver extend the surface interval.

6.3. OXYGEN EXPOSURE

The oxygen exposure calculations are based on currently accepted exposure time limit tables and principles. In addition to this the dive computer uses several methods to conservatively estimate the oxygen exposure. These include for example: the displayed oxygen exposure calculations are upped to the next higher percentage value for recreational scuba diving, the recommended upper limit of 1.4 bar PO2 is used as a default the CNS% limits up to 1.6 bar are based on 1991 NOAA Diving Manual limits the OTU monitoring is based on the long-term daily tolerance level and the recovery rate is reduced Oxygen related information displayed by the dive computer is also designed to ensure all warnings and displays in the appropriate phases of a dive. E.g. the following information will be shown before and during a dive, when the computer is set in Nitrox mode: the selected O2% the color-coded OLF% bar graph for either CNS% or OTU% audible alarms are given and the OLF bar graph starts to blink when the 80% and 100% limits are exceeded

My Suunto

The My Suunto section of the site is meant for your personal information. You can store information about yourself, your wristop computer, your sporting and training activities, etc. When you upload your personal logs to SuuntoSports.com they are displayed in your personal information. Here you can also manage them and decide if they can be presented to all other community users or just to limited groups. When you have uploaded logs to SuuntoSports.com, you can create charts from the dive related data in the logs. You can also publish your logs and compare them with other users logs. The My Suunto section also contains a personal calendar that you can use to mark personal events and other useful information.

Communities

In the Communities section, SuuntoSports.com users can form or search groups and manage their own groups. For example, you can create a group for all your diving friends, and share information about each others trips, give advice and discuss where and when you could go diving together. Groups can be either open or closedclosed groups mean that you have to apply for a membership and be accepted, before you can participate in group activities.
All groups have a home page that displays information about group events and includes news, noticeboard and other information. Group members can also use group-specic bulletin boards, chat rooms and group calendars, and add links and create group activities.

Sport Forums

SuuntoSports.com has its own forum for each Suunto sport. The basic features and functions are the same for all sport forumssport-specic news, bulletin boards and chat rooms. Users can also suggest links to sports-related sites and tips regarding the sport and equipment to be published on the site, or publish their own travel reports. Sport forums include presentations of the resorts that are related to the sport. Users can rank the resorts with comments and the results are published next to the resort information. A ranking list can also be created for other thingsfor example, where are the best diving sites, what group has most members, who has uploaded most logs, and so on.

8.3. GETTING STARTED

To join the SuuntoSports.com community, connect to the Internet, open your web browser and go to www.suuntosports.com. When the opening page appears, click the Register icon and register yourself and your Suunto sports instrument. You can change and update your personal and equipment proles in My Suunto section afterwards. After the registration you will automatically enter the SuuntoSports.com home page that introduces the site structure and functional principles. Note! SuuntoSports.com is continuously developed further and its content is subject to change.