SUUNTO VYTEC User Manual

DEFINITION OF WARNINGS, CAUTIONS AND NOTES

Throughout this manual, special references are made when deemed important. Three classifications are used to separate these references by their order of importance.

WARNING - is used in connection with a procedure or situation

CAUTION - is used in connection with a procedure or situation

NOTE - is used to emphasize important information.

that may result in serious injury or death.

that will result in damage to the product.

This instruction manual is copyrighted and all rights are reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated, or reduced to any media without prior written consent from SUUNTO.

SUUNTO, VYTEC, Consumed Bottom Time (CBT), Oxygen Limit Fraction (OLF), SUUNTO Reduced Gradient Bubble Model (RGBM), Continuous Decompression and their logos are all registered or unregistered trademarks of SUUNTO. All rights are reserved.

The CE mark is used to mark conformity with the European Union EMC directive 89/336/EEC and Personal Protective Equipment directive 89/ 686/EEC. The SUUNTO dive instruments fulfill all the required EU directives.

FIOH, Laajaniityntie 1, FIN-01620 Vantaa, Finland, notified body no.0430, has EC type-examined this type of personal protective equipment.

EN 250 Respiratory equipment - Open circuit self-contained compressed air diving apparatus  Requirements, testing, marking.

The cylinder pressure gauge and the parts of this product used in measuring the cylinder pressure meet the requirements set in the section of the European Standard EN 250 that concern cylinder pressure measurements. The instruments must be serviced by an authorized dealer every second year or after 200 dives (whichever comes first).

PrEN 13319

PrEN 13319 Diving accessories  Depth gauges and combined depth and time measuring devices  Functional and safety requirements, test methods is a European diving depth gauge standard draft. The VYTEC is designed to comply with this draft standard.

ISO 9001

SUUNTO Oys Quality Assurance System is certified by Det Norske Veritas to be according to the ISO 9001 in all SUUNTO Oys operations (Quality Certificate No. 96-HEL-AQ-220).

SUUNTO Oy does not assume any responsibility for losses or claims by third parties, which may arise through the use of this device.

Due to continuous product development, the VYTEC is subject to change without notice.

WARNING!

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

WARNING!

NOT FOR PROFESSIONAL USE! Suunto dive computers are intended for recreational use only. The demands of commercial or professional diving may expose the diver to depths and exposures that tend to increase the risk of decompression illness (DCI). Therefore, Suunto strongly recommends that the device be not used for commercial or professional diving activity.

WARNING!

ONLY DIVERS TRAINED IN THE PROPER USE OF SCUBA DIVING EQUIPMENT SHOULD USE A DIVE COMPUTER! No dive computer can replace the need for proper dive training. Insufficient or improper training may cause diver to commit errors that may lead to serious injury or death.

WARNING!

THERE IS ALWAYS A RISK OF DECOMPRESSION ILLNESS (DCI) FOR ANY DIVE PROFILE EVEN IF YOU FOLLOW THE DIVE PLAN PRESCRIBED BY DIVE TABLES OR A DIVE COMPUTER. NO PROCEDURE, DIVE COMPUTER OR DIVE TABLE WILL PREVENT THE POSSIBILITY OF DCI OR OXYGEN TOXICITY! An individuals physiological make up can vary from day to day. The dive computer cannot account for these variations. You are strongly advised to remain well within the exposure limits provided by the instrument to minimize the risk of DCI. As an added measure of safety, you should consult a physician regarding your fitness before diving.

WARNING!

SUUNTO STRONGLY RECOMMENDS THAT SPORT DIVERS LIMIT THEIR MAXIMUM DEPTH TO 40 M [130 FT] OR TO THE DEPTH CALCULATED BY THE COMPUTER BASED ON THE SELECTED O

AND A MAXIMUM PO2 OF 1.4 BAR!

WARNING!

DIVES WITH REQUIRED DECOMPRESSION STOPS ARE NOT RECOMMENDED. YOU SHOULD ASCEND AND BEGIN DECOMPRESSION IMMEDIATELY WHEN THE DIVE COMPUTER SHOWS YOU THAT A DECOMPRESSION STOP IS REQUIRED! Note the blinking ASC TIME symbol and the upward pointing arrow.

WARNING!

USE BACK-UP INSTRUMENTS! Make sure that you use back-up instrumentation including a depth gauge, submersible pressure gauge, timer or watch, and have access to decompression tables whenever diving with the dive computer.

WARNING!

PERFORM PRECHECKS! Always activate and check the device before diving in order to ensure that all Liquid Crystal Display (LCD) segments are completely displayed, that the device has not run out of battery power, and that the oxygen, altitude and personal adjustments are correct. Also, exit the Data Transfer (TR-PC) mode before diving, as the computer does not automatically revert to Dive mode from Data Transfer mode.

WARNING!

YOU ARE ADVISED TO AVOID FLYING ANY TIME THE COMPUTER COUNTS DOWN THE NO-FLYING TIME. ALWAYS ACTIVATE THE COMPUTER TO CHECK THE REMAINING NO-FLY TIME PRIOR TO FLYING! The computer goes into the stand-by display automatically 5 minutes after the dive has ended. The stand-by display shuts off after two hours. Flying or traveling to a higher altitude within no-fly time can greatly increase the risk of DCI. Review the recommendations given by Divers Alert Network (DAN) in chapter

3.6.3. Flying After Diving. There can never be a flying after diving rule that is guaranteed to completely prevent decompression illness!

WARNING!

THE DIVE COMPUTER 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 up to four days prior to initial use of the computer may cause misleading information and must be avoided.

WARNING!

DO NOT EXPOSE THE VYTEC´S OPTIONAL PRESSURE TRANSMITTER TO ANY GAS MIX CONTAINING MORE THAN 40% OXYGEN! Enriched air with greater oxygen content presents a risk of fire or explosion and serious injury or death.

WARNING!

DO NOT DIVE WITH A CYLINDER OF ENRICHED AIR IF YOU HAVE NOT PERSONALLY VERIFIED ITS CONTENTS AND ENTERED THE ANALYZED VALUE INTO YOUR DIVE COMPUTER! Failure to verify cylinder contents and enter the appropriate O

% into your dive computer will result in incorrect dive planning

information.

WARNING!

THE DIVE COMPUTER WILL NOT ACCEPT FRACTIONAL PERCENTAGE VALUES OF OXYGEN CONCENTRATION. DO NOT ROUND UP FRACTIONAL PERCENTAGES! For example, 31.8% oxygen should be entered as 31%. Rounding up will cause nitrogen percentages to be understated and will affect decompression calculations. If there is a desire to adjust the computer to provide more conservative calculations, use the personal adjustment feature to affect decompression calculations or reduce the PO oxygen exposure.

setting to affect

WARNING!

SET THE CORRECT ALTITUDE ADJUSTMENT MODE! When diving at altitudes greater than 300 m [1000 ft] the Altitude Adjustment feature must be correctly selected in order for the computer to calculate the decompression status. The dive computer is not intended for use at altitudes greater than 3000 m [10000 ft]. Failure to select the correct Altitude Adjustment setting or diving above the maximum altitude limit will result in erroneous dive and planning data.

WARNING!

SET THE CORRECT PERSONAL ADJUSTMENT MODE! Whenever it is believed that factors that tend to increase the possibility of DCI exist, it is recommended that you use this option to make the calculations more conservative. Failure to select the correct Personal Adjustment setting will result in erroneous dive and planning data.

NOTE!

It is not possible to change between Air, Nitrox and Gauge modes before the instrument has counted down the no-flying time.

There is one exception to this: You can change from Air to Nitrox mode even during the no-flying time. When planning both air and nitrox dives during the same dive series, you should set the instrument in Nitrox mode and modify the gas mix accordingly.

In Gauge mode, the no-flying time is always 48 hours.

TABLE OF CONTENTS

WARNINGS! ...................................................................................................... 2

1. INTRODUCTION .......................................................................................... 8

1.1. SAFETY PRECAUTIONS ......................................................................... 9

1.1.1. Emergency Ascents ....................................................................... 9

1.1.2. Dive Computer Limitations ............................................................ 10

1.1.3. Nitrox ............................................................................................. 10

2. GETTING ACQUAINTED ............................................................................... 10

2.1. FUNCTIONS ............................................................................................ 10

2.2. PUSH BUTTONS..................................................................................... 11

2.3. WATER CONTACTS ............................................................................... 12

2.4. WIRELESS PRESSURE TRANSMISSION ............................................ 13

2.4.1. Installing the transmitter ................................................................ 13

2.4.2. Pairing and code selection ............................................................ 14

2.4.3. Transmission data ......................................................................... 15

3. DIVING WITH THE VYTEC ............................................................................ 17

3.1. BEFORE DIVING..................................................................................... 17

3.1.1. Activation and Prechecks .............................................................. 17

3.1.2. Battery indication ........................................................................... 18

3.1.2.1. Battery Power Indicator ................................................... 18

3.1.2.2. Wireless transmitter battery indicator .............................. 20

3.1.3. Dive Planning [PLAN] .................................................................... 20

3.1.4. User Definable Functions and Alarms .......................................... 21

3.2. SAFETY STOPS ...................................................................................... 21

3.2.1. Recommended Safety Stop .......................................................... 21

3.2.2. Mandatory Safety Stop .................................................................. 22

3.3. DIVING IN AIR MODE ............................................................................. 23

3.3.1. Basic Dive Data ............................................................................. 23

3.3.2. Bookmark ...................................................................................... 24

3.3.3. Cylinder Pressure Data ................................................................. 24

3.3.4. Consumed Bottom Time (CBT) ..................................................... 25

3.3.5. Ascent Rate Indicator .................................................................... 25

3.3.6. Decompression dives .................................................................... 26

3.4. DIVING IN NITROX MODE ..................................................................... 30

3.4.1. Before Diving ................................................................................. 30

3.4.2. Oxygen Displays ........................................................................... 31

3.4.3. Oxygen Limit Fraction (OLF) ......................................................... 33

3.4.4. Gas Change, Multiple Breathing Gas Mixes ................................ 33

3.5. DIVING IN GAUGE MODE ...................................................................... 34

3.6. AT THE SURFACE .................................................................................. 35

3.6.1. Surface Interval ............................................................................. 35

3.6.2. Dive Numbering ............................................................................. 36

3.6.3. Flying After Diving ......................................................................... 37

3.7. AUDIBLE AND VISUAL ALARMS ........................................................... 38

3.8. HIGH ALTITUDE DIVES AND PERSONAL ADJUSTMENT .................. 40

3.8.1. Altitude Adjustment ....................................................................... 40

3.8.2. Personal Adjustment ..................................................................... 40

3.9. ERROR CONDITIONS ............................................................................ 42

4. MENU BASED MODES .................................................................................. 43

4.1. MEMORIES AND DATA TRANSFER [1 MEMORY] ............................... 45

4.1.1. Logbook and Dive Profile Memory [1 LOGBOOK] ....................... 45

4.1.2. Dive History Memory [2 HISTORY] .............................................. 48

4.1.3. Data Transfer and PC-Interface [3 TR-PC] ................................... 49

4.2. SIMULATION MODE [2 SIMUL] .............................................................. 50

4.2.1. Dive Simulator [1 SIMDIVE] .......................................................... 50

4.2.2. Dive Planning Simulator [2 SIMPLAN] ......................................... 51

4.3. SET MODES [3 SET] .............................................................................. 51

4.3.1. Dive Parameter Settings [1 SET DIVE] ........................................ 52

4.3.1.1. Altitude Adjustment, Personal Adjustment and RGBM

Settings [1 AdJ MODE] .................................................................. 52

4.3.1.2. Dive Time Alarm Setting [2 d ALARM] ............................ 53

4.3.1.3. Maximum Depth Alarm Setting [3 MAX DPTH] .............. 53

4.3.1.4. Nitrox/Oxygen Settings [4 NITROX] ................................ 53

4.3.2. Setting Time [2 SET TIME] ........................................................... 54

4.3.2.1. Adjusting Time [1 AdJ TIME] ........................................... 54

4.3.2.2. Adjusting Date [2 AdJ DATE] .......................................... 54

4.3.2.3. Adjusting Daily Alarm [3 T ALARM] ................................. 55

4.3.3. Setting Preferences [3 SET PREF] .............................................. 55

4.3.3.1. Backlight Setting [1 LIGHT] ............................................. 55

4.3.3.2. Dive Computer Units Setting [2 UNITS] .......................... 56

4.3.3.3. Wireless Transmission Settings [3 HP] ........................... 56

4.3.3.4. Profile Sample Rate Setting [4 REC] .............................. 56

4.3.3.5. Dive Computer Model Setting [5 MODEL]

5. CARE AND MAINTENANCE .......................................................................... 57

5.1. IMPORTANT INFORMATION.................................................................. 57

5.2. CARE OF YOUR DIVE COMPUTER ...................................................... 57

5.3. MAINTENANCE ....................................................................................... 58

5.4. WATER RESISTANCE INSPECTION ..................................................... 58

5.5. BATTERY REPLACEMENT .................................................................... 59

5.5.1. Computer battery........................................................................... 59

5.5.2. Wireless transmitter battery replacement ..................................... 62

6. TECHNICAL DESCRIPTION .......................................................................... 64

6.1. OPERATING PRINCIPLES ..................................................................... 64

6.2. SUUNTO REDUCED GRADIENT BUBBLE MODEL (RGBM) ............... 66

6.3. OXYGEN EXPOSURE ............................................................................ 67

6.4. TECHNICAL SPECIFICATION ................................................................ 68

7. WARRANTY ................................................................................................. 71

8. SUUNTOSPORTS.COM ................................................................................. 72

8.1. SYSTEM REQUIREMENTS ................................................................... 72

8.2. SUUNTOSPORTS.COM SECTIONS ..................................................... 73

8.3. GETTING STARTED ............................................................................... 74

9. GLOSSARY

 AIR/NITROX/GAUGE .................................................. 56

1. INTRODUCTION

Congratulations on your purchase of the SUUNTO VYTEC advanced dive computer. The Vytec builds on the Suunto tradition of delivering feature-rich dive computers. The Suunto Vytec provides many new and enhanced features that cannot be found in other dive computers, such as gas switching and optional wireless air-integration. Push button controls access a wide selection of choices. The display is optimized for the dive mode chosen. This air-integrated dive computer is a compact and sophisticated multipurpose dive instrument, designed to give you years of trouble-free service.

Choice of Operating Modes and Set-up Options

User options for the Vytec are selected using the push buttons.

Pre Dive configuration and setup options include:

 Choice of operating mode  Air / Nitrox / Gauge  Wireless Air Integration on/off  Cylinder alarm setting  Choice of unit  Metric / Imperial  Maximum depth alarm  Dive time alarm  Backlight settings  Clock, calendar, daily alarm  Mix Oxygen fraction % (Nitrox mode only)  Maximum PO  Altitude adjustment  Personal adjustment  RGBM adjustment  Sample rate setting 10, 20, 30 or 60 seconds for dive profile  Multiple breathing gases

Continuous Decompression with Suunto RGBM

The Suunto Reduced Gradient Bubble Model (RGBM) utilized in the Vytec predicts both dissolved and free gas in blood and tissues of divers. It is a significant advance on the classic Haldane models, which do not predict free gas. The advantage of Suunto RGBM is additional safety through its ability to adapt to a variety of situations and dive profiles.

In order to optimize how to respond to different added risk situations an additional category of stop, referred to as a Mandatory Safety Stop, has

(Nitrox mode only)

been introduced. Also a countdown for the Recommended Safety Stop is included. The combination of stop types will depend on the specific dive situation.

To get the most from the safety benefits be sure to read the summary of the Reduced Gradient Bubble Model in chapter 6.2.

1.1. SAFETY PRECAUTIONS

Do not attempt to use the dive computer without reading this instruction manual in its entirety, including all the warnings. Make sure that you fully understand the use, displays and limitations of the instrument. If you have any questions about the manual or the dive computer, contact your SUUNTO dealer before diving with the dive computer.

Always remember that YOU ARE RESPONSIBLE FOR YOUR OWN SAFETY!

When used properly, the dive computer is an outstanding tool for assisting properly trained, certified divers in planning and executing sport dives. It is NOT A SUBSTITUTE FOR CERTIFIED SCUBA INSTRUCTION, including training in the principles of decompression.

Diving with enriched air mixtures (nitrox) exposes the user to risks different from those associated with diving with standard air. These risks are not obvious and require training to understand and avoid. Risks include possible serious injury or death.

Do not attempt to dive with any gas mix other than standard air without first receiving certified training in this specialty.

1.1.1. Emergency Ascents

In the unlikely event that the dive computer malfunctions during a dive, follow the emergency procedures provided by your certified dive training agency or, alternatively,

STEP 1: Assess the situation calmly and then move promptly to

STEP 2: At 18 m [60 ft], slow down your ascent rate to 10 m/min

STEP 3: Stay there as long as you assess your air supply will

less than 18 m [60 ft].

[33 ft/min] and move to a depth between 3 and 6 meters [10 to 20 ft].

safely allow. After reaching the surface stay out of the water for at least 24 hours.

1.1.2. Dive Computer Limitations

While the dive computer is based on current decompression research and technology, you 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 theoretical mathematical models, which are intended to serve as a guide to reduce the probability of decompression illness.

1.1.3. Nitrox

Diving with nitrox provides the diver with an opportunity to increase bottom times or reduce the risk of decompression illness by reducing the nitrogen content in the breathing gas mix.

However, when the gas mix is altered, the oxygen content of the mix is generally increased. This increase exposes the diver to an oxygen toxicity risk not usually considered in recreational diving. In order to manage this risk, the dive computer tracks the time and intensity of the oxygen exposure and provides the diver with information to adjust the dive plan in order to maintain oxygen exposure within reasonably safe limits.

In addition to the physiological effects of enriched air on the body there are operational considerations to be addressed when handling altered breathing mixes. Elevated concentrations of oxygen present a fire or explosion hazard. Consult with the manufacturer of your equipment in regards to its compatibility with nitrox.

2. GETTING ACQUAINTED

2.1. FUNCTIONS

The Suunto VYTEC can be set to function as a regular air dive computer, a nitrox dive computer or as a depth gauge with timer mode.

The VYTEC multipurpose dive computer is an air integrated computer featuring three dive computer modes (AIR, NITROX, GAUGE), three main operating modes (TIME/STAND-BY, SURFACE, DIVING), three menu based main modes (MEMORY, SIMULATION, SET) and 18 menu based submodes (review separate Quick Reference Guide). You can scroll through the modes using the push buttons. The mode indicator at the left side and the mode text at the bottom of the display indicate the selected mode.

The timekeeping display is the default display of the instrument (Fig. 2.1.). If a button is not pressed within 5 minutes, the dive computer beeps and returns to the timekeeping display automatically (except in Diving and Simulation modes). The timekeeping display shuts off after two hours, but pressing the PLAN or TIME button activates it.

Making the Vytec personal

For best use of the Vytec take some time and make it YOUR computer.

Set the correct time and date. Read this manual. Set dive alarms and make all the other settings listed in the introduction in this manual. Install the Vytec in your console or fit it on your wrist. If the Vytec is to be used with the optional wireless pressure transmitter install it and enable the pressure transmission in the Vytecs settings. Try the pressure transmission.

Use the dive simulator for getting to know the dive display

All this so you know your computer and have it set up as you want it before getting into the water.

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. 2.1. Time keeping display. Pressing PLAN or TIME button activates display.

Fig. 2.2. Push buttons of the dive computer.

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, confirm 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 profile 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 (

The dive computer is controlled with the /Select/OK/Quit) and the s PLAN and TIME t push buttons and with the water contacts as follows:

Activation press the

instrument in water for five (5) seconds.

Dive Planning in the Surface Mode, press the PLAN (s) button.

Menu Modes press the

The display is illuminated in surface mode by holding down the SMART button for more than two seconds .

t, decrease).

SMART (MODE/On/Backlight/

SMART (On) button or immerse the

SMART (MODE) -button.

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 highpressure port of the regulator (Fig. 2.5). By using the transmitter the diver can benefit from cylinder pressure and remaining air time data.

In order to use the transmitter the wireless integration needs to be enabled in the Vytecs settings. To enable or disable the wireless integration refer to chapter 4.3.3.3 Cylinder pressure settings.

2.4.1. Installing the Transmitter

Upon purchasing the Vytec, Suunto strongly recommends you have your dealer attach the transmitter to the first stage of your regulator.

If you decide to attach it yourself, follow the steps outlined below:

Remove the high pressure (HP) port plug on the first stage of your regulator using an appropriate tool.

Thread the high pressure transmitter of the Vytec into the HP port of your regulator with your fingers. DO NOT OVERTIGHTEN! Maximum torque 6 Nm (4.4 ftlbs or 53 inlbs). Sealing is based on a static o-ring, not force!

Attach the regulator to the scuba cylinder. Slowly open the valve. Check for leaks by submerging the regulator first stage in water. If leaks are detected, check the condition of the o-ring and sealing surfaces.

Fig. 2.4. Active water contacts are indicated by the text AC.

Fig. 2.5. Vytecs optional wireless pressure transmitter.

2.4.2. Pairing and Code Selection

In order to receive wireless data the transmitter and the Vytec wrist unit need to be paired. During the pairing procedure the transmitter and wrist unit select a common transmission code.

The transmitter turns on when the pressure exceeds 15bar [218 psi] and it then starts sending pressure data together with a code number. During the pairing procedure the Vytec stores the above mentioned code number and starts displaying pressure values that are received with that code. This coding procedure inhibits data mix up from other divers also using the Vytecs transmitter.

When there is no stored code the Vytec will display SETC and receive with lowered sensitivity from a very short distance only (Fig. 2.6 a). By taking the Vytec close to the transmitter it will store the received code and start receiving with full sensitivity and display data received with this code only. The code is held stored as long as the time keeping display is on, or until the cylinder pressure goes below 10 bar [145 psi], or by the user manually erasing the code.

To pair the transmitter and the wrist unit:

1. Make sure that the transmitter is properly attached to the regulators HP port and that the regulator is properly attached to the cylinder.

2. Ensure that the Vytec is turned on, an that the wireless integration is enabled in the Vytecs settings (HP set on, see chapter 4.3.3.3). The Vytec should display SETC in the lower left corner.

3. Slowly open the cylinder valve fully and pressurize the regulator. The transmitter will start transmitting when the pressure exceeds 15bar [218 psi].

4. Take the Vytec wrist unit close to the transmitter. The Vytec will now shortly display the selected code number and then start displaying the transmitted cylinder pressure. A lightning symbol will be displayed every time the Vytec receives a valid signal.

The user can change the code by reducing the pressure to less than 10 bar [145 psi] and then increasing the pressure above 60 bar [870 psi]. This means the transmitter code will automatically change when you change to a fresh cylinder. This can also be used if your dive buddy has the same code and you want to change the code.

WARNING:

TIME

DIVE

bar

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 verified 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

DIVE

bar

TIME

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.

NOTE: In order to save battery energy the transmitter shuts off if the pressure remains unchanged for more than 5 minutes and it will

DIVE

bar

TIME

continue transmitting with the saved code when any pressure change is measured. The code number is changed if pressure is less than 10bar [145 psi] at shutoff.

DIVE

bar

TIME

2.4.3. Transmission Data

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 flashes the lightning figure in the displays 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).

Fig 2.6. Pressure transmission related displays.

DIVE

bar

TIME

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).

TABLE 2.1. PRESSURE TRANSMISSION RELATED DISPLAYS

Display Indication Figure 2.6

SETC No code stored, set code a

- - - Pressure reading over 360 bar [5220 psi] b

FAIL Indicates pressure reading has not been

updated in more than 1 minute c

LOBT Indicates pressure transmitter battery voltage d

is low. Change the transmitter battery!

OFF Pairing has not been conducted before e

start of dive. No cylinder data available.

QUIT

3. DIVING WITH THE VYTEC

MAXAVGPO2

NO DEC TIME

STOP

TIME

SURF

DIVE

O2%

ASC TIME

CEILING

QUIT

SELECT

OPTIONS

S L O W

OLF

DIVE

psi

AIR

bar

This section contains instructions on how to operate the dive computer and interpret its displays. You will find that this dive computer is easy to use and read. Each display shows only the data relevant to that specific diving situation.

3.1. BEFORE DIVING

3.1.1. Activation and Prechecks

The dive computer will activate if submerged deeper than 0.5 m (1.5 ft). However, it is necessary to turn on the Dive Mode before diving to check the cylinder pressure, altitude and personal adjustment settings, battery condition, oxygen settings etc. Press the SMART (Mode) button to activate the instrument.

After activation all display elements will turn on showing mostly figure 8s and graphical elements (Fig. 3.1.). A few seconds later the battery power indicator is shown and the backlight and the buzzer are activated (Fig. 3.2. display a, b, c or d depending on the battery voltage). If set to Air mode the screen will enter the Surface mode (Fig. 3.3.). If set to Gauge mode the text GAUGE is shown (Fig. 3.4.) and if set to Nitrox mode the essential oxygen parameters are shown with the text NITROX (Fig. 3.21.) before the Surface mode.

At this time, perform your prechecks making sure that:

 the instrument operates in the

correct mode and provides a complete display (Air/Nitrox/ Gauge modes)

 the low battery indicator is not on  the altitude, personal adjustment

and RGBM settings are correct

Fig. 3.1. Startup I. All segments shown.

Fig. 3.2. Startup II. Battery power indicator.

DIVE

bar

TIME

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.

Fig. 3.4. Startup IV. Gauge mode.

 the instrument displays correct units

of measurement (Metric/Imperial)

 the instrument displays correct-

temperature and depth (0.0 m [0 ft])

 the buzzer beeps

IIf the optional wireless pressure trans-mitter is used (see chapter 2.4. Wireless pressure

TIME

transmission) ensure that:

 the pressure transmitter has been-

properly 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.

DIVE

bar

TIME

Fig. 3.5. Low Battery Warning. Battery symbol indicates that the battery is low and battery replacement is recommended.

3.1.2. Battery Indication

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

QUIT

DIVE

NO DEC TIME

MAX

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 Operation Figure 3.2

BAT + 4 segments + OK Normal, full battery. a

BAT + 3 segments 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. b

LOWBAT + Battery power is low and 2 segments + the battery replacement is c low battery symbol recommended.

The battery symbol is displayed.

The backlight is disabled. c

LOWBAT + 1 segment + QUIT+ low battery symbol Change the battery! d

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.

3.1.2.2. Wireless Transmitter Battery Indicator

The pressure transmitter sends out a lowbat (LOBT) warning when its battery voltage is getting low. This is shown intermittently instead of the pressure reading (see chapter 2.4.3, Fig 2.6). When you get this warning the pressure transmitter battery needs to be replaced.

3.1.3. Dive Planning [PLAN]

To enter Planning Mode, press the PLAN button at any time during Surface Mode. After showing the text PLAN (Fig. 3.6.), the display will show the no-decompression limit for the depth of 9 m [30 ft]. By pressing the down arrow (t) (TIME) button, the dive computer will calculate and show the next deeper no-decompression limits in 3 m [10 ft] increments ending at 45 m [150 ft]. By pressing the up arrow (s) (PLAN) button, the next shallower depth will be shown again.

The Planning Mode is canceled by pressing the

NOTE! The Planning mode is disabled in Gauge mode and in Error mode (see section 3.9. Error Conditions). The planning mode calculates no dec times for MIX1 only. If additional mixes are enabled in the Nitrox mode they do not affect the calculations in PLAN mode.

Higher Altitude and conservative Personal Adjustment Modes will shorten the no-decompression time limits. These limits at different Altitude and Personal Adjustment Mode selections are shown in Table 6.1 and 6.2 in section 6.1. Operating Principles.

The Planning mode also accounts for the following information from previous dives:

 any calculated residual nitrogen  all dive history for the past four days  oxygen toxicity (Nitrox mode)

The no-decompression times given for different depths will therefore be shorter than before your first fresh dive.

DIVE NUMBERING SHOWN DURING DIVE PLANNING

Dives belong to the same repetitive dive series, if the instrument was still counting down the no-fly time at the beginning of the dive.

SMART (QUIT) button.

The surface interval must be at least 5 minutes for a dive to be considered a repetitive dive. Otherwise, it is considered a continuation of the same dive. The dive number will not change and the dive time will continue,

where it left off (see also section 3.6.2. Dive Numbering).

3.1.4. User Definable Functions and Alarms

This Vytec has several User Definable Functions and depth and time related alarms that you can set according to your personal preference.

The dive computer model, unit of measurement and backlight preferences can be set in the MODE- SET- SET PREF submode. The dive time and the depth alarms can be set in the MODE- SET- SET DIVE submode and the alarm clock can be set in the MODE- SET- SET TIME submode. Setting of the user definable functions and alarms are explained in detail in section 4.3. Set Modes.

3.2. SAFETY STOPS

Safety stops are widely considered good diving practice and are an integral part of most dive tables. Reasons to perform a safety stop include a reduction in sub clinical DCI, microbubble reduction, ascent control, and orientation before surfacing.

The Vytec displays two different types of safety stops: Recommended Safety Stop and Mandatory Safety Stop.

The Safety Stops are indicated by:

- STOP label, when in the depth range 3 m  6 m [10 ft - 20 ft] = Recommended Safety Stop Countdown

- STOP+ CEILING label, when in the depth range 3 m  6 m [10 ft - 20 ft] = Mandatory Safety Stop Time display

- STOP label, when deeper than 6 m = Mandatory Safety Stop scheduled

3.2.1. Recommended Safety Stop

With every dive over 10 meters the instrument has a three minute countdown for the recommended safety stop, to be taken in the 3 - 6 meter [10 ft - 20 ft] range. This is shown with the STOP sign and a threeminute countdown in the center window instead of the no-decompression time (Fig. 3.11.).

The Recommended Safety Stop, as the name implies, is recommended. If it is ignored, there is no penalty applied to the following surface intervals and dives.

3.2.2. Mandatory Safety Stop

MAX

NO DEC TIME

B T

bar

DIVE

TIME

Fig. 3.7. Dive has just begun and no air time is shown. First estimate of remaining air time will be shown after 30-60 seconds.

MAX

AIR

TIME

NO DEC TIME

bar

DIVE TIME

Fig. 3.8. Diving display. Present depth is 19.3 m [63 ft] and no-decompression stop time limit is 23 minutes in A0/P1 mode. Maximum depth during this dive was 19.8 m [65 ft], elapsed dive time is 16 minutes.

MAX

AIR

TIME

NO DEC TIME

B T

bar

DIVE TIME

°C

Fig. 3.9. Diving display. Present cylinder pressure is 210 bar [3045 psi] and remaining air time 41 minutes. Alternative display of current time and temperature is shown for 5 seconds after pressing TIME button.

When the ascent rate exceeds 12 meters/min [40 ft] momentarily or 10 meters/min [33ft] continuously the micro-bubble build-up is predicted to be more than allowed for in the decompression model. The Suunto RGBM calculation model responds to this by adding a Mandatory Safety Stop to the dive. The time of this Mandatory Safety Stop will depend on the severity of the ascent rate excess.

The STOP sign will appear in the display and when you reach the depth zone between 6 m to 3 m [20 ft to 10] also the CEILING label, ceiling depth and the calculated Safety Stop time appear in the display. You should wait until the Mandatory Safety Stop warning disappears (Fig. 3.14.).

The Mandatory Safety Stop time always includes the three minute Recommended Safety Stop time. The total length of the Mandatory Safety Stop time depends on the seriousness of the ascent rate violation.

You must not ascend shallower than 3 m [10 ft] with the Mandatory Safety Stop warning on. If you ascend above the Mandatory Safety Stop ceiling, a downward pointing arrow will appear and a continuous beeping starts (Fig.

3.15.). You should immediately descend to, or below, the Mandatory Safety Stop ceiling depth. If you correct this situation at any time during that dive, there are no affects on the decompression calculations for future dives.

If you continue to violate the Mandatory Safety Stop, the tissue calculation model is affected and the dive computer shortens the available no-decompression time for your

TIME

next dive. In this situation, it is recommended to prolong your surface interval time before your next dive.

3.3. DIVING IN AIR MODE

The Vytec has three operating modes: Air mode for diving with standard air only, Nitrox mode for diving with oxygen enriched (EANx) mixtures and Gauge mode for use as bottomtimer. The Air mode is enabled in the MODE-SET-SET PREF-MODEL submode (see section 4.3. Set Modes).

3.3.1. Basic Dive Data

The dive computer will remain in the Surface mode at depths less than

1.2 m [4 feet]. At depths greater than 1.2 m the instrument will go into the Diving mode (Fig. 3.7.).

All information on the display is labeled (Fig. 3.7. and 3.8.). During a no-decompression stop dive, the following information will be displayed:

 your present depth in meters [ft]  the maximum depth during this dive in meters [ft], indicated as

MAX

 the available no-decompression time in minutes in the center

window as NO DEC TIME and as a bar graph on the left side of the display. It is calculated based on the five factors described in section 6.1. Operating Principles.

 the water in temperature in °C [°F] in the lower left corner  the elapsed dive time in minutes, shown as DIVE TIME in the

lower right corner

 the Altitude Adjustment setting on the left side of the center

window with a wave and mountain symbols (A0, A1, or A2) (see Table 3.4.)

 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.)

In addition with the optional wireless transmission enabled:

 the Remaining Air-time in the left center window  the cylinder pressure in bar [or psi] displayed in the lower left

corner

Alternative displays by pressing the TIME but-

MAX

ton (Fig. 3.9.):

 the current time, shown as TIME  the water temperature in °C [°F]

AIR

TIME

NO DEC TIME

B T

bar

DIVE TIME

NOTE! In Dive Mode the alternative display switches back to the main display after 5 seconds.

Fig. 3.10. Bookmark activation. An annotation, Bookmark, is placed in the profile memory during a dive by pressing PLAN button. Note the Logbook symbol.

MAX

STOP

AIR

TIME

B T

bar

DIVE TIME

Fig. 3.11. A three minute Recommended Safety Stop.

MAX

AIR

TIME

NO DEC TIME

B T

bar

DIVE TIME

Fig. 3.12. Cylinder pressure warnings. Pressure has dropped below 50 bar [725 psi]. Pressure display is blinking and there is an audible alarm.

3.3.2. Bookmark

It is possible to make special marks in the profile memory during a dive. These Bookmarks will be shown as a dive log symbol when scrolling the profile 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 profile 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 first estimation of remaining air time will be 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 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.

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