SUUNTO D4i
User’s GUide
en
1. WELCOME TO THE WORLD OF SUUNTO DIVE COMPUTERS .. ... ... ... ... ... 8
2. WARNINGS, CAUTIONS, AND NOTES . ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... .. 9
3. SUUNTO USER INTERFACE . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... 18
3.1. Navigating in the menus . ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... 19
3.2. Button symbols and functions . . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... 21
4. GETTING STARTED .. ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . .. 23
4.1. TIME mode settings . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. 24
4.1.1. Setting the alarm . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . 26
4.1.2. Setting the time ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... 27
4.1.3. Setting the dual time . ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... .. 27
4.1.4. Setting the date .. ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... . 27
4.1.5. Setting the units . ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... . 28
4.1.6. Setting the backlight . . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... .. 28
4.1.7. Setting the contrast ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... ... . 29
4.1.8. Setting the tones . . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. 29
4.2. Stopwatch ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . . 30
4.3. AC water contacts . ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... . 31
4.4. Apnea Timer .. ... ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... . 32
5. BEFORE DIVING . ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . 34
5.1. The Suunto RGBM ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... . 34
5.2. Emergency ascents . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. 35
5.3. Dive computer limitations ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... 35
5.4. Freediving ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . . 36
5.5. Audible and visual alarms . ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... . 36
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5.6. Error conditions . ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... ... ... ... . 41
5.7. Wireless transmission . ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... 42
5.7.1. Installing the wireless transmitter .. ... ... ... ... ... . .. . .. . ... ... ... ... ... ... 42
5.7.2. Pairing and code selection . . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... . 43
5.7.3. Transmitting data .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . . 46
5.8. DIVE mode settings . . .. . ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . . 48
5.8.1. Setting the nitrox values ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . . 50
5.8.2. Setting the personal/altitude adjustments . .. . .. . .. . ... ... ... ... ... ... ... . 51
5.8.3. Setting the tank pressure pairing . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... . 51
5.8.4. Setting the tank pressure alarm . ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . . 52
5.8.5. Setting the depth alarm .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... . 52
5.8.6. Setting the depth notify alarm (FREE mode) . ... ... ... ... . .. . .. . .. . ... ... 53
5.8.7. Setting the dive-time alarm . . ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... . 53
5.8.8. Setting the surface time notify alarm (FREE mode) .. ... ... ... ... ... ... . 54
5.8.9. Setting the sample rate . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... 54
5.8.10. Setting the deep stops . . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... . 55
5.8.11. Setting the air time . . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... 55
5.8.12. Setting the units .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . . 56
5.9. Activation and pre-checks ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... .. 56
5.9.1. Accessing DIVE mode ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... . 57
5.9.2. DIVE mode activation .. . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... 57
5.9.3. Battery power indication . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... .. 60
5.9.4. Diving at altitude .. ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... 61
5.9.5. Personal adjustments .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... 62
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5.10. Safety Stops . ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. 64
5.10.1. Recommended Safety Stops . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... . 64
5.10.2. Mandatory Safety Stops ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... 65
5.11. Deep stops . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... .. 66
6. DIVING . ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . 68
6.1. Diving in the AIR mode (DIVE Air) . ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... 68
6.1.1. Basic dive data . ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... .. 69
6.1.2. Bookmark . ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . . 70
6.1.3. Tank pressure data .. . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... 71
6.1.4. Ascent rate indicator . . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... .. 72
6.1.5. Stopwatch (Timer) . . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . . 73
6.1.6. Decompression dives . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... .. 74
6.2. Diving in NITROX mode (DIVE Nitrox) . ... ... ... ... ... ... . .. . .. . ... ... ... ... ... 79
6.2.1. Before diving in the NITROX mode . ... ... ... ... . .. . .. . ... ... ... ... ... ... . 79
6.2.2. Oxygen displays ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... .. 80
6.2.3. Oxygen limit fraction (OLF%) ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. 82
6.3. Diving in the FREE mode (DIVE Free) ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. 82
6.3.1. Day History . ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... 83
6.3.2. Free dive time limit . ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... . 84
7. AFTER DIVING ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . . 85
7.1. Surface interval ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... .. 85
7.2. Dive numbering . ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... ... ... ... . 86
7.2.1. FREE Dive . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . . 87
7.3. Repetitive dive planning . . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... 87
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7.4. Flying after diving . ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... .. 87
7.5. DIVE PLANNING mode (PLAN NoDec) . ... ... ... ... ... . .. . .. . ... ... ... ... ... . 88
7.5.1. Dive numbering shown during dive planning . . .. . .. . ... ... ... ... ... ... .. 90
7.6. MEMORY mode . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... 90
7.6.1. Dive logbook (MEM Logbook) . ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... . 91
7.6.2. Dive history (MEM History) .. ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... . 93
7.7. Suunto DM4 . . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . 95
7.8. Movescount . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... .. 96
8. CARE AND MAINTENANCE OF MY SUUNTO DIVING COMPUTER . . .. . ... .. 98
9. BATTERY REPLACEMENT . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... . 101
9.1. Wireless transmitter battery replacement . ... ... . .. . .. . ... ... ... ... ... ... ... . 101
9.1.1. Transmitter battery kit . . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... .. 102
9.1.2. Required tools .. . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... . 102
9.1.3. Replacing the transmitter battery . . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... . 102
10. TECHNICAL DATA ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . 104
10.1. Technical specifications ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... ... ... .. 104
10.2. Suunto RGBM ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... . 108
10.2.1. Suunto RGBM adaptive decompression . ... ... ... . .. . .. . ... ... ... ... . 109
10.2.2. No-decompression limits for air .. ... ... ... ... ... ... ... . .. . .. . ... ... ... .. 110
10.2.3. Altitude diving ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... .. 112
10.3. Oxygen exposure . . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . . 113
11. INTELLECTUAL PROPERTY . ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . ... 114
11.1. Trademark . ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... . 114
11.2. Copyright . ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. 114
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11.3. Patent notice . ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . 114
12. DISCLAIMERS . . ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... 115
12.1. CE . ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... . 115
12.2. EN 13319 ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... 115
12.3. EN 250 / FIOH . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. 115
13. SUUNTO LIMITED WARRANTY . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . ... ... ... .. 116
14. DISPOSAL OF THE DEVICE . ... ... ... ... ... . .. . .. . .. . ... ... ... ... ... ... ... . .. . .. . 118
GLOSSARY ... ... ... . .. . .. . ... ... ... ... ... ... ... ... . .. . .. . ... ... ... ... ... ... ... . .. . .. . .. . 119
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1. WELCOME TO THE WORLD OF SUUNTO DIVE COMPUTERS
Suunto D4i wristop dive computer is designed to help you get the most out of your
diving.
Suunto D4i simplifies your diving experience because all the information you need
relating to depth, time, optional tank pressure, and decompression status is available
on one easy-to-read display.
The Suunto D4i User's Guide contains vitally important information which enables you
to become familiar with your Suunto wristop dive computer. To understand the use,
displays, and limitations of the instrument before using it, please read this user's guide
carefully, and save it for further reference. Note also that a glossary is included at the
back of the user's guide to help you understand dive-specific terminology.
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2. WARNINGS, CAUTIONS, AND NOTES
Throughout this user's guide, important safety icons are displayed. Three classifications
are used to separate these icons by their order of importance:
WARNING
is used in connection with a procedure or situation that may result
in serious injury or death
CAUTION
NOTE
Before you go on to read the user's guide itself, it is extremely important that you read
the following warnings. These warnings are intended to maximize your safety while
using Suunto D4i and must not be ignored.
WARNING
WARNING
is used in connection with a procedure or situation that will result
in damage to the device
is used to emphasize important information
YOU MUST READ the leaflet and user guide for your dive computer. Failure to do so may lead to improper use, serious injury
or death.
ALLERGIC REACTIONS OR SKIN IRRITATIONS MAY OCCUR
WHEN PRODUCT IS IN CONTACT WITH SKIN, EVEN THOUGH
OUR PRODUCTS COMPLY WITH INDUSTRY STANDARDS.
IN SUCH EVENT, STOP USE IMMEDIATELY AND CONSULT
A DOCTOR.
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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 conditions that tend to increase the risk of decompression illness (DCI).
Therefore, Suunto strongly recommends that the device not be
used for any commercial or professional diving activities.
WARNING
WARNING
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ONLY DIVERS TRAINED IN 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 a diver to commit errors that may
lead to serious injury or death.
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
TABLEWILL 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 O2% AND A MAXIMUM PO2OF 1.4 BAR! Exposure
to greater depths increases the risk of oxygen toxicity and decompression illness.
WARNING
WARNING
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.
USE BACK-UP INSTRUMENTS! Ensure 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.
PERFORM PRE-CHECKS! Always activate and check the device
before diving in order to ensure that all Liquid Crystal Display
(LCD) segments are completely displayed, the device has not
run out of battery power, and that the oxygen, altitude, personal,
and Safety/Deep Stop are correct.
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WARNING
YOU ARE ADVISED TO AVOID FLYING ANY TIME THE COMPUTER COUNTS DOWN THE NO-FLY TIME. ALWAYS ACTIVATE THE COMPUTER TO CHECK THE REMAINING NO-FLY
TIME PRIOR TO FLYING! Flying or traveling to a higher altitude
within the no-fly time can greatly increase the risk of DCI. Review
the recommendations given by Divers Alert Network (DAN). There
can never be a flying after diving rule that is guaranteed to completely prevent decompression illness!
WARNING
WARNING
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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, the dive computer 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.
DO NOT EXPOSE ANY PART OF YOUR DIVE COMPUTER 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
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
PO2setting to affect oxygen exposure according to the entered
O2% and PO2values. As a safety precaution, the oxygen calculations in the dive computer are made with an oxygen percentage
of 1% + set O2%.
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.
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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.
WARNING
WARNING
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DO NOT EXCEED THE MAXIMUM ASCENT RATE! Rapid ascents increase the risk of injury. You should always make the
Mandatory and Recommended Safety Stops after you have exceeded the maximum recommended ascent rate. If this Mandatory
Safety Stop is not completed the decompression model will penalize your next dive(s).
YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN DISPLAYED BY THE INSTRUMENT! 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 during your decompression. In order to avoid
doing so by accident, you should stay somewhat below the ceiling.
WARNING
WARNING
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 O2% into your dive computer will result in incorrect dive
planning information.
Diving with gas mixtures exposes you to risks that are 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.
Traveling to a higher elevation can temporarily cause a change
in the equilibrium of dissolved nitrogen in the body. It is recommended that you acclimatize to the new altitude by waiting at
least three hours before diving.
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WARNING
WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE
MAXIMUM LIMIT IS REACHED, YOU MUST IMMEDIATELY
TAKE ACTION TO REDUCE OXYGEN EXPOSURE. Failure to
take action to reduce oxygen exposure after the warning is given
can rapidly increase the risk of oxygen toxicity, injury, or death
WARNING
WARNING
WARNING
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Suunto recommends that you receive training in Free diving
techniques and physiology before conducting breath hold dives.
No dive computer can replace the need for proper dive training.
Insufficient or improper training may cause a diver to commit errors
that may lead to serious injury or death.
If there are several divers using the dive computer with wireless
transmission, always ensure that each diver is using a different
code before starting the dive.
Using the Suunto Dive Planner software is not a substitute for
proper dive training. Diving with mixed gases has dangers that
are not familiar to divers diving with air. To dive with trimix, triox,
heliox and nitrox or all of them, divers must have specialized
training for the type of diving they are doing.
WARNING
Always use realistic SAC rates and conservative turn pressures
during dive planning. Overly optimistic or erroneous gas planning
can result in the exhaustion of breathing gas during decompression or in a cave or a wreck.
WARNING
CAUTION
NOTE
ENSURE THE WATER RESISTANCE OF THE DEVICE! Moisture
inside the device and/or battery compartment may seriously
damage the unit. Only an authorized SUUNTO service center
should do service activities.
Never lift or carry your cylinder by holding the wireless tank
pressure transmitter as this may break the cover and cause
flooding of the unit. If your cylinder falls down with the transmitter
attached to the regulator first stage, ensure that the transmitter
has not been damaged before diving with it.
It is not possible to change to AIR mode after a dive in NITROX
mode, before the No-fly time has elapsed.
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.
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3. SUUNTO USER INTERFACE
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Safety Stop Indicator
No-Fly Icon
Diver Attention Symbol
Ascent Rate Bar Graph
Dive Alarm Indicator
Daily Alarm Indicator
Low Battery Warning
Present Depth
Tank Pressure Bar Graph
Wireless Transmission
Indicator
Date
Dual Time
Maximum Depth
O
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% (Nitrox Mode)
Time
Tank Pressure
Active Water Contact
Indicator
Current Time Display
Mode Indicator
No-Decompression Time
Total Ascent Time
Ceiling Depth
Remaining Air Time
Safety/Deep Stop Time
Surface Interval Time
No-Fly Time
Tissue Saturation Graph
Apnea Timer
Seconds Display
Stopwatch
Weekday
Dive Time
Dive Number
Temperature
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% (Nitrox Mode)
OLF% (Nitrox Mode)
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3.1. Navigating in the menus
Suunto D4i has four main operating modes - TIME mode (TIME), DIVE mode (DIVE),
PLAN mode (PLAN), and MEMORY mode (MEM). It also has a APNEA TIMER submode, which can be activated from TIME mode. To toggle between the main modes,
press the MODE button. To select a submode in DIVE and MEM modes, press the
UP/DOWN buttons.
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SETTINGS
Alarm
Time
Dual Time
Date
Units
Backlight
Contrast
Tones
SUB-MODES
Air
Nitrox
Free
Off
SETTINGS
Nitrox
Personal/Altitude
Tank Press Pairing
Tank Press Alarm
Depth Alarm
Depth Notify Alarm
Dive Time Alarm
Surface Time Notify Alarm
Sample Rate
Deepstop
Air Time
Units
TIME DIVE PLAN MEM
SUB-MODES
Logbook
History
LIGHT LIGHT LIGHT LIGHT
APNEA TIMER
SETTINGS
Ventilation
Increment
Repeats
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3.2. Button symbols and functions
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The table below explains the main functions of the dive computer's buttons. The buttons
and their use is explained in more detail in the relevant sections of the user's guide.
Table 3.1. Button symbols and functions
Main functionsPressButtonSymbol
ShortMODE
Switch between main modes
Switch from submode to main mode
Activate backlight in DIVE mode
LongMODE
Activate backlight in other modes
Activate stopwatch in DIVE mode
ShortSELECT
Select a submode
Select and accept settings
Select stopwatch to stop or start in DIVE mode
Displays Day History in FREE mode (free dive
mode)
ShortUP
Toggle between alternative displays
Change submode
Increase values
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Main functionsPressButtonSymbol
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LongUP
Activate Apnea Timer in TIME mode
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ShortDOWN
Toggle between alternative displays
Change submode
Decrease values
LongDOWN
Enter Setting mode
Toggle between ceiling and remaining air time
display
4. GETTING STARTED
To get the most out of your Suunto D4i, use some time to personalize it and really
make it YOUR computer. Set the correct time and date, the alarms, as well as the unit
and backlight settings.
Suunto D4i is a very user-friendly dive computer, and you will quickly become familiar
with its functions. Make absolutely sure that you know your computer and have it set
up as you want it BEFORE getting into the water.
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4.1. TIME mode settings
BETWEEN DIVES YOU
CAN CHECK YOUR SURFACE
INTERVAL TIME FROM THE
TIME MODE SHORTCUTS!
The first thing to do with your Suunto D4i is to set the TIME mode shortcuts: the time,
alarm, dual time, date, units, backlight, contrast, and tones.
The figure below shows how to toggle between different shortcuts in the TIME mode:
NOTE
NOTE
Now that after you know how to toggle between the shortcuts, you can start to set
them.
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The seconds display reverts to date display after 5 minutes in
order to save battery power.
The display is illuminated by holding down the MODE button for
more than 2 seconds.
The figure below shows how to enter the TIME Settings menu.
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E
USE UP AND DOWN BUTTONS
TO TOGGLE BETWEEN ALARM, TIME,
DUAL TIME, DATE, UNITS, CONTRAST
AND TONES.
25
4.1.1. Setting the alarm
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
The dive computer has a daily alarm function. The alarm can be set to be activated
only once, on weekdays or every day. When the daily alarm activates, the screen
blinks and the alarm sounds for 60 seconds. Press any button to stop the alarm.
26
4.1.2. Setting the time
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
In the Time setting mode, you are able to set the hour, minute, and second, as well
as choose between a 12 and 24 hour display.
4.1.3. Setting the dual time
In the Dual Time setting mode, you are able to select the hour and minute of a dual
time, which is useful when traveling to a different time zone.
4.1.4. Setting the date
In the Date setting mode, you are able to set the year, month, and day. The day of
the week is automatically calculated in accordance with the date. In metric units the
date is presented as DD/MM, and in imperial units as MM/DD.
27
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
4.1.5. Setting the units
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
In the Units setting mode, you are able to choose whether the units are displayed in
either the metric or imperial system (meters/feet, Celsius/Fahrenheit, and so on).
4.1.6. Setting the backlight
In the Backlight setting mode, you are able to turn the backlight ON or OFF and to
define how long it stays on for (5, 10, 20, 30, or 60 seconds).
NOTE
28
When the backlight is turned OFF, it does not illuminate when an
alarm sounds.
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
4.1.7. Setting the contrast
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
In the Contrast setting mode, you are able to set the contrast of the display (the value
range is between 0 and 10).
4.1.8. Setting the tones
In the Tones setting mode, you are able to activate or deactivate the tones.
29
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
NOTE
USE DOWN BUTTON TO START STOPWATCH
AND TAKE A SPLIT TIME. THE UP BUTTON STOPS THE
STOPWATCH. IF YOU HAVE TAKEN SPLIT TIMES, YOU CAN
SCROLL THEM BY SHORT PRESSING THE UP BUTTON.
LONG PRESSING UP RESETS THE STOPWATCH.
When the tones are off, there are no audible alarms.
4.2. Stopwatch
The Stopwatch function in Suunto D4i measures elapsed and split times.
30
4.3. AC water contacts
AC APPEARS IN THE TOP RIGHT
CORNER OF THE DISPLAY, WHEN THE DIVE
COMPUTER IS IN CONTACT WITH WATER.
THIS ALSO ACTIVATES THE DIVE MODE.
The water and data transfer contact is located on the side of the case. When submerged, the water contact poles are connected by the conductivity of the water and
the “AC” symbol appears on the display. The AC text is shown until the water contact
deactivates.
Contamination or dirt on the water contact may prevent this automatic activation.
Therefore, it is important that the water contact is kept clean. The contact can be
cleaned with fresh water and a soft brush, for example a tooth brush.
31
4.4. Apnea Timer
You can use the Apnea Timer function for interval training in freediving. To set the
Apnea Timer, follow these steps:
1. Long press UP in the TIME mode to enter the Apnea Timer.
2. In the Apnea Timer, long press DOWN to enter settings in which you can define
the duration of the ventilation period and the incremental increase/decrease in
time for each cycle (repetition). You can adjust values with the UP and DOWN
buttons.
3. Short press SELECT, and define the number of cycles.
4. Start the first cycle by short pressing DOWN.
The timer counts down the ventilation time, which is also indicated by two short
beep tones.
5. Short press DOWN to start the Apnea cycle. Press DOWN again when a new
ventilation cycle begins. Repeat until the end of the defined number of cycles.
You can reset the apnea timer by long pressing UP.
Note that the apnea timer allows up to 20 cycles and the number of allowed cycles is
dependent on the length of the ventilation period and on the incremental increase/decrease. The last ventilation period cannot be shorter than 5 seconds or longer than
20 minutes.
32
33
5. BEFORE DIVING
Do not attempt to use the dive computer without reading this user's guide 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, Suunto D4i 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.
WARNING
Do not attempt to dive with any gas mix other than standard air without first receiving
certified training in this specialty.
5.1. The Suunto RGBM
Suunto’s Reduced Gradient Bubble Model (RGBM), utilized in the Suunto D4i, predicts
both dissolved and free gas in the 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
Technical RGBM is additional safety through its ability to adapt to a variety of situations
and dive profiles.
34
Diving with gas mixtures exposes you to risks that are 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.
In order to optimize the response to different increased risk situations, an additional
category of stop, referred to as a Mandatory Safety Stop, has been introduced. The
combination of stop types depends on the user settings and the specific dive situation.
To get the most from the Suunto Technical RGBM safety benefits, refer to Sec-
tion 5.8.10. Setting the deep stops and Section 5.11. Deep stops.
5.2. 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,
follow these steps:
Assess the situation calmly and then move promptly to less than 18 m/60 ft.
1.
At 18 m/60 ft, slow down your ascent rate to 10 m/33 ft per minute and move to
2.
a depth between 3 and 6 m/10 and 20 ft.
Stay there for as long as your air supply will safely allow. After reaching the sur-
3.
face, do not dive for at least 24 hours.
5.3. 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.
35
5.4. Freediving
Freediving, and particularly freediving in combination with scuba diving, may present
risks that have not been researched and are not commonly known.
Anyone who engages in any form of breath hold diving is in danger of shallow-water
blackout (SWB), that is, the sudden loss of consciousness caused by oxygen starvation.
Any breath hold diving results in some nitrogen build-up in the blood and other fast
tissues. Due to the short time spent at depth, this build-up is generally not significant.
Therefore, provided the effort involved in freediving has not been severe, there is little
risk in diving after breath hold diving. However, the reverse is more unknown and may
significantly increase the risk of DCI. Therefore, FREEDIVING AFTER SCUBA DIVING
IS NOT RECOMMENDED. You should avoid freediving, and not exceed 5 m/16 ft, for
at least two hours after scuba diving.
WARNING
5.5. Audible and visual alarms
The dive computer has audible and visual alarms that advise when important limits
are approached or that prompt you to acknowledge preset alarms. The table below
describes the different alarms and their meanings.
36
Suunto recommends that you receive training in freediving techniques and physiology before conducting breath hold dives. No
dive computer can replace the need for proper dive training. Insufficient or improper training may cause a diver to commit errors
that may lead to serious injury or death.
Table 5.1. Dive computer alarms
DurationSound patternAlarm type
2.4 s sound + 2.4 s breakHigh priority
Low priority
Table 5.2.
Ascending
The visual information on the dive computer display is shown during the alarm breaks
in order to save battery.
0.8 s sound + 3.2 s break
InterpretationSound patternInstructional beep
Start ascending
Start descendingDescending
37
Table 5.3. Audible and visual alarm types
High priority alarm followed
by "Start ascending" beep,
repeated for the maximum of
three minutes. The PO2value
blinks.
High priority alarm followed
by "Start descending" beep,
repeated for the maximum of
three minutes. The Er symbol
blinks and an arrow points
downwards.
High priority alarm, sounded
three times. The SLOW symbol blinks.
Low priority alarm followed by
"Start ascending" beep,
sounded two times. The ASC
TIME symbol blinks and an
arrow points upwards.
38
PO2 value is greater than the adjusted value. Current
depth is too deep for the gas in use. You should immediately ascend or change to a gas with a lower oxygen
percentage.
Decompression ceiling depth is exceeded. You should
immediately descend to, or below, the ceiling.
Maximum allowed ascent rate, 10 m per min / 33 ft per
min, is exceeded. Slow the ascend rate down.
No-decompression dive turns into a decompression
stop dive. Depth is below the decompression floor
level. You should ascend to, or above, the floor.
Alarm reasonAlarm type
Low priority alarm followed by
"Start descending" beep, for
the duration of the Deep Stop
violation. The DEEPSTOP
symbol blinks and an arrow
points downwards.
Low priority alarm followed by
"Start descending" beep, repeated for three minutes. An
arrow points downwards.
Low priority alarm followed by
two short beeps, sounded
once. The DEEPSTOP and
timer symbols are displayed.
Low priority alarm, sounded
two times. The Tank pres-
sure value blinks.
Alarm reasonAlarm type
Mandatory Deep Stop is violated. You should descend
to complete the Deep Stop.
Mandatory Safety Stop is violated. You should descend
to complete the Safety Stop.
The Deep Stop depth is reached. Make the Mandatory
Deep Stop for the duration shown by the timer.
Cylinder pressure reaches the selected alarm pressure,
10–200 bar / 200–2900 psi. Cylinder pressure reaches
the fixed alarm pressure, 50 bar/700 psi. This alarm
operates only if the pairing to the wireless tank pressure transmitter is performed correctly and the transmission of tank pressure data is not disrupted during
the dive for any reason. You can acknowledge the
alarm.
39
Low priority alarm, sounded
two times. The OLF% value
blinks if the PO2 value is
greater than 0.5 bar.
Low priority alarm, sounded
two times. The Maximum
depth value blinks.
Low priority alarm, sounded
two times. The Dive time
value blinks.
Low priority alarm, sounded
once. The Maximum depth
value blinks.
Low priority alarm, sounded
once. The Surface time value
blinks.
Alarm reasonAlarm type
The OLF value reaches the fixed 80% or 100%. In the
DIVE Nitrox mode only. You can acknowledge the
alarm.
The selected depth (3–120 m / 10–394 ft) is exceeded.
The fixed maximum depth (120 m / 394 ft) is exceeded.
You can acknowledge the alarm.
The selected dive time (1–999 min) is exceeded. You
can acknowledge the alarm.
Indicates reaching a certain depth. In the DIVE Free
mode only. You can acknowledge the alarm.
Indicates the length of the surface time before a new
dive. In the DIVE Free mode only. You can acknowledge the alarm.
40
NOTE
When the backlight is turned OFF, it does not illuminate when an
alarm is activated.
NOTE
When the tones are turned OFF, the alarms are not sounded
when an alarm is activated.
WARNING
5.6. Error conditions
The dive computer has warning indicators that alert you to react to certain situations
that would significantly increase the risk of DCI. If you do not respond to its warnings,
the dive computer will enter an Error mode, indicating that the risk of DCI has greatly
increased. If you understand the dive computer and operate it sensibly, it is very unlikely
you will ever put the instrument into the Error mode.
Omitted decompression
The Error mode results from omitted decompression, for example, when you stay
above the ceiling for more than three minutes. During this three-minute period the Er
warning is shown and the audible alarm beeps. After this, the dive computer enters a
permanent Error mode. The instrument will continue to function normally if you descend
below the ceiling within this three-minute period.
WHEN THE OXYGEN LIMIT FRACTION INDICATES THAT THE
MAXIMUM LIMIT IS REACHED, YOU MUST IMMEDIATELY
TAKE ACTION TO REDUCE OXYGEN EXPOSURE. Failure to
take action to reduce oxygen exposure after the warning is given
can rapidly increase the risk of oxygen toxicity, injury, or death.
41
When the dive computer is in the permanent Error mode, only the Er warning is shown
in the center window. The dive computer does not show times for ascent or stops.
However, all the other displays function as before to provide information for ascent.
You must immediately ascend to a depth of 3 to 6 m/10 to 20 ft and remain at this
depth until air supply limitations require you to surface.
After surfacing, you should not dive for a minimum of 48 hours. During the permanent
Error mode, the Er text is displayed in the center window and the planning mode is
disabled.
5.7. Wireless transmission
In order to use the transmitter, the wireless integration needs to be enabled in your
Suunto D4i settings. To enable or disable the wireless integration, refer to Section 5.8.3.
Setting the tank pressure pairing.
5.7.1. Installing the wireless transmitter
When purchasing the Suunto D4i, we strongly recommend that you have your Suunto
representative attach the transmitter to the first stage of your regulator.
However, if you decide to attach it yourself, do the following:
Remove the high pressure (HP) port plug on the first stage of your regulator using
1.
an appropriate tool.
Thread the high pressure transmitter of the Suunto D4i into the HP port of your
2.
regulator with your fingers. DO NOT OVERTIGHTEN! Maximum torque is 6 Nm/4.4
lbsft or 53 lbsin. The seal is based on a static O-ring, not force!
42
Attach the regulator to the scuba cylinder and slowly open the valve. Check for
3.
leaks by submerging the regulator first stage in water. If leaks are detected, check
the condition of the O-ring and sealing surfaces.
5.7.2. Pairing and code selection
In order to receive wireless data, the transmitter and the Suunto D4i need to be paired.
During the pairing procedure, the dive computer locks on the code that the transmitter
has.
The transmitter is activated when the pressure exceeds 15 bar/300 psi and it then
starts sending pressure data together with a code number. During the pairing procedure,
the Suunto dive computer stores the code number and starts displaying pressure
values that are received with that code. This coding procedure prevents data mix-up
from other divers also using a Suunto wireless transmitter.
When there is no stored code, the Suunto D4i displays “cd:--” and receives data with
lowered sensitivity from a very short distance only (0.1–0.5m / 0.5–1 ft). The flash
symbol is not displayed at this phase. By taking the Suunto unit close to the transmitter,
it will store the received code and start receiving with full sensitivity and display data
received with this code only.
NOTE
To pair the transmitter and the Suunto D4i dive computer:
The pairing procedure only needs to be performed once, before
the first use. You do not need to redo the pairing unless you
change the transmitter to a new one, or another diver in your
group uses the same code as you.
43
Ensure that the transmitter is properly attached to the regulator’s HP port and
1.
that the regulator is properly attached to the cylinder.
Ensure that the Suunto D4i is turned on, and that the wireless integration is en-
2.
abled in the Suunto D4i settings (Tank Press is set ON. For more information,
refer to Section 5.8.3. Setting the tank pressure pairing). If the Suunto D4i is in
the TIME mode, enter the DIVE mode by short-pressing the MODE button. The
D4i should display “cd:--” in the lower left corner of the display.
Slowly open the cylinder valve fully and pressurize the system. The transmitter
3.
starts transmitting when the pressure exceeds 15 bar/300 psi.
Take the Suunto D4i unit close to the transmitter. The unit will then quickly display
4.
the selected code number and then start displaying the transmitted cylinder
pressure. The wireless transmitter indicator (blinking flash symbol) is displayed
every time the Suunto D4i receives a valid signal.
WARNING
In case there are several divers using the same code, the transmitter's code must be
changed before diving.
To assign a new transmitter code:
Slowly open the cylinder valve fully to pressurize the system.
1.
Immediately close the tank valve, and quickly depressurize the regulator so that
2.
the pressure is reduced to less than 10 bar/145 psi. Wait about 10 seconds, and
slowly open the cylinder valve again to re-pressurize to above 15 bar/300 psi.
The transmitter assigns a new code automatically.
44
If there are several divers using a Suunto wireless transmitter,
always ensure that each diver is using a different code before
starting the dive.
NOTE
To re-pair the transmitter with the new code and the Suunto D4i dive computer:
In the DIVE mode of the Suunto D4i, long-press the DOWN button to enter the
1.
DIVE settings. Enter the Tank Press Pairing menu (Refer to Section 5.8.3. Setting
the tank pressure pairing). Short-press the SELECT button to bypass the tank
pressure ON/OFF selection (the tank pressure transmission must remain ON).
In the next menu, a Code number is displayed. Clear the code by short-pressing
2.
the UP button (toggle from “Ok” to “Clear”), and press the SELECT button.
Short-press the MODE button to exit the DIVE settings.
3.
To pair on the new transmitter code, the Suunto D4i code must
be cleared first.
45
Take the Suunto D4i unit close to the transmitter (the system must be pressurized
4.
to above 15bar/300 psi). The dive computer displays the received new code
number and then start displaying the transmitted cylinder pressure. The wireless
transmitter indicator (flash symbol) is displayed every time the Suunto D4i receives
a valid signal.
NOTE
5.7.3. Transmitting data
After the pairing procedure, the Suunto D4i will receive cylinder pressure data from
the transmitter. The pressure is displayed in either bars or psi, depending on the unit
selected. Any time the Suunto D4i receives an appropriate signal, a flash symbol is
displayed in the lower left corner.
Table 5.4. Pressure transmission related displays
Cd:--
Cd:10
46
No code stored, the Suunto unit is ready for pairing with the
transmitter.
Set Code. Code number can be between 01–40.
In order to save battery energy, the transmitter enters power
saving mode with slower data transmission rate if the tank pressure remains unchanged for more than five (5) minutes. The
transmitter continues transmitting with the saved code when any
pressure change is detected (e.g., the user presses the purge
button on regulator or breathes from the regulator).
FigureIndicationDisplay
A
B
- - -
A B C D E
no conn
batt
The flash symbol is blinking. Pressure reading exceeds allowed
limit (over 360 bar/5220 psi).
Text "no conn" is displayed when the unit receives no data packets
from the transmitter.
Pressure reading has not been updated for more than one minute.
The latest valid pressure reading is displayed intermittently. The
flash symbol is not displayed.
Transmitter is out of range (>1.2 m/4 ft), in power saving mode or
on another channel. Activate the transmitter by breathing off the
regulator, and bring the D-series unit closer to the transmitter then
check if the flash symbol appears. If not, clear the code on the
Suunto D-series unit.
Pressure transmitter battery voltage is low. The pressure reading
is displayed intermittently. Change the transmitter battery!
FigureIndicationDisplay
C
D
E
47
5.8. DIVE mode settings
Suunto D4i has several user-definable functions, as well as depth and time-related
alarms that you can set according to your personal preferences. The DIVE mode
settings are dependent on the dive submode chosen (AIR, NITROX, FREE), so that,
for example, nitrox settings are only available in the NITROX submode.
The table below shows what DIVE settings are available in each DIVE submode.
Table 5.5.
FREE modeNITROX modeAIR modeSetting
XNitrox
XXPersonal/Altitude
XXTank pressure pairing
XXTank pressure alarm
XXXDepth alarm
XDepth notify alarm
XXXDive time alarm
XSurf time notify alarm
XXXSample rate
XXDeep stop
48
FREE modeNITROX modeAIR modeSetting
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
USE UP AND
DOWN BUTTONS TO
TOGGLE BETWEEN
DIVE SETTINGS.
XXAir time
The figure below shows how to enter the DIVE mode settings menu.
XXXUnits
NOTE
Some settings cannot be changed until five (5) minutes has
elapsed after the dive.
49
5.8.1. Setting the nitrox values
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
ADJUST WITH
UP AND DOWN
BUTTONS. ACCEPT
WITH SELECT
BUTTON.
If set to the NITROX mode, the correct oxygen percentage of the gas in your cylinder
must always be entered into the computer to ensure correct nitrogen and oxygen
calculations. In addition, the oxygen partial pressure limit must be set. When in the
NITROX setting mode, the maximum operating depth (MOD), based on the chosen
setting, will also be displayed.
The default oxygen percentage (O2%) setting is 21% (air) and oxygen partial pressure
(PO2) setting 1.4 bar.
NOTE
If the oxygen content of a mix is set to 22% or above, the setting
will remain stored until changed; it does not automatically revert
back to 21%.
50
5.8.2. Setting the personal/altitude adjustments
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
The current Altitude and Personal Adjustment settings are displayed in the startup
screen when entering the DIVE mode. If the mode does not match the altitude or
personal conditions (refer to Section 5.9.4. Diving at altitude and Section 5.9.5. Per-
sonal adjustments), it is imperative that you enter the correct selection before diving.
Use Altitude Adjustment to select the correct altitude and use Personal Adjustment to
add an extra level of conservatism.
5.8.3. Setting the tank pressure pairing
In the Tank Pressure Pairing setting mode, the wireless transmission can be set “ON”
or “OFF” depending on whether the wireless pressure transmitter is used or not. When
the wireless transmission is set “OFF”, no cylinder pressure-related data is shown,
nor data reception made. The Code setting allows you to verify the selected transmitter
code and to clear the stored transmitter code. Clearing the code enables re-pairing
with the transmitter, which can be necessary if a new transmitter or used, or if several
divers are using the same transmitter code.
51
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
5.8.4. Setting the tank pressure alarm
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
The tank pressure alarm can be set "ON" or "OFF" and in the range of 10–200 bar.
The alarm is the secondary cylinder pressure alarm point. The alarm is activated when
the tank pressure drops below the set limit. You can acknowledge this alarm.
The 50 bar/700 psi alarm, however, is fixed and cannot be changed. You can acknowledge this alarm.
5.8.5. Setting the depth alarm
The Depth Alarm setting is factory-set to 30 m/100 ft, but you can adjust it according
to your personal preference, or switch it off altogether. The depth range can be set
from 3 m to 120 m/10 ft to 394 ft.
52
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
5.8.6. Setting the depth notify alarm (FREE mode)
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
You can set five independent Depth Notify Alarms to indicate a certain depth, for example, start of free falling or mouth filling in freediving.
5.8.7. Setting the dive-time alarm
The Dive Time Alarm setting can be activated and used for several purposes to add
to your diving safety.
53
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
NOTE
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
With a range of 1–999 minutes, the alarm can be set to your
planned bottom time, for example.
5.8.8. Setting the surface time notify alarm (FREE mode)
You can set the Surface Time Notify Alarm to indicate the length of the surface time
before a new dive. Suunto D4i starts counting the time automatically when you surface
(at 0.5 m/1.6 ft).
5.8.9. Setting the sample rate
The Sample Rate setting controls how often the depth, tank pressure (if enabled), and
water temperature is stored in the memory.
54
You can set the dive profile sample rate in free dive to 1, 2, or 5 seconds. The sample
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
rate for nitrox and air dives is 10, 20, 30, or 60 seconds. The factory default setting is
20 seconds.
5.8.10. Setting the deep stops
In the AIR mode in the Deep Stops setting mode, the Deep stops can be set “ON” or
“OFF” depending on whether the Deep stops are used or not.
5.8.11. Setting the air time
In the Air Time setting mode, the remaining air time display can be set "ON" or "OFF"
depending on whether estimated remaining air time display is used or not. Air Time
can only be displayed when the wireless tank pressure transmitter is in use.
55
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
5.8.12. Setting the units
ADJUST WITH UP AND
DOWN BUTTONS. ACCEPT
WITH SELECT BUTTON.
In the Unit settings you are able to choose between metric (meters/Celsius/bar) and
imperial (feet/Fahrenheit/psi) units.
5.9. Activation and pre-checks
This section describes how to activate the DIVE mode and explains the pre-checks
that it is highly recommended you perform before you get into the water.
56
5.9.1. Accessing DIVE mode
The Suunto D4i has three diving modes: AIR mode for diving with standard air only,
NITROX mode for diving with oxygen enriched mixtures, and FREE mode for freediving.
There is also a Dive OFF mode for use during other water activities, such as swimming
and surfing.
5.9.2. DIVE mode activation
Unless the DIVE mode is set OFF, the dive computer activates automatically when
submerged deeper than 0.5 m/1.5 ft. However, it is necessary to activate the DIVE
mode BEFORE diving to check the altitude and personal adjustment settings,
battery condition, oxygen settings, and so on.
After activation, all graphical display elements are turned ON, and the backlight and
the beep are activated. After this, the selected altitude and personal settings are displayed. A few seconds later the battery power indicator is shown, as well as the
maximum operating depth (MOD, 66.2 m), O2% (21%) and PO2(1.6) value. During a
dive series (between two consecutive dives) the dive computer also displayes the
current tissue saturation graph. A few seconds later the battery power indicator is
shown.
57
WARNING
A TISSUE SATURATION GRAPH IS DISPLAYED BETWEEN DIVES WHEN
DIVE MODE IS ACTIVATED. ON X-AXIS THE FAST TISSUES ARE ON LEFT AND
SLOW TISSUES ON RIGHT. ON Y-AXIS, CALCULATED PERCENTUAL TISSUE
SATURATION VALUES BASED ON RGBM ARE SHOWN. Y-AXIS RANGES FROM
0% TO 100%. AS SURFACE TIME ELAPSES, TISSUE SATURATION
PERCENTAGES DECREASE ACCORDINGLY.
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 O2% AND A MAXIMUM PO2OF 1.4 BAR! Exposure
to greater depths increases the risk of oxygen toxicity and decompression illness.
58
NOTE
If the Dive mode is set OFF, the unit does not activate automatically. Always check you use the correct Dive mode before entering
the water.
At this time, perform your pre-checks, and ensure that:
the instrument operates in the correct mode and provides a complete display
•
(AIR/NITROX/FREE mode)
the battery level is ok.
•
the altitude, personal adjustment, Deep stops settings are correct.
•
the instrument displays correct units of measurement (Metric/Imperial).
•
the instrument displays the correct temperature and depth (0.0 m/0 ft).
•
the alarm beeps.
•
If the optional wireless pressure transmitter is used ensure that:
the pressure transmitter has been properly attached and the cylinder valve is open
•
the transmitter and the wrist unit have been properly paired on a suitable code
•
the pressure transmitter is working (flash symbol blinks, cylinder pressure is dis-
•
played), and that there is no low battery warning displayed
you have enough air for your planned dive. You should also check the pressure
•
reading against your back-up pressure gauge
And, if set to NITROX mode, ensure that:
the correct oxygen percentage is adjusted according to the measured oxygen
•
percentage in your cylinder
the oxygen partial pressure limit is set correctly
•
For more information on the NITROX mode, please refer to Section 6.2. Diving in NI-
TROX mode (DIVE Nitrox).
The dive computer is now ready for diving.
59
5.9.3. Battery power indication
Temperature or internal oxidation of the battery affect the battery voltage. If the instrument is stored for a long period, or used in cold temperatures, the low battery warning
may be displayed even though the battery has enough capacity. In these cases, reenter DIVE mode to receive the battery power indication.
After the battery check, the low battery warning is indicated by the battery symbol.
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
The optional wireless pressure transmitter sends out a low battery (batt) warning when
its battery voltage is getting low. This is shown intermittently instead of the pressure
reading. When you get this warning, the tank pressure transmitter's battery needs to
be replaced.
60
For safety reasons, the backlight cannot be activated when the
low battery warning is indicated by the battery symbol.
5.9.4. Diving at altitude
The dive computer can be adjusted both for diving at altitude and also to increase the
conservatism of the mathematical nitrogen model.
When programming the instrument for the correct altitude, you need to select the
correct Altitude Adjustment settings according to Table 5.6, Altitude Adjustment settings.
The dive computer will adjust its mathematical model according to the entered altitude
setting, giving shorter no-decompression times at higher altitudes.
For more information, see Section 10.2.3. Altitude diving.
Table 5.6. Altitude Adjustment settings
value
Altitude rangeAlt. adjustment
0–300 m / 0–1000 ftA0
300–1500 m / 1000–5000 ftA1
1500–3000 m / 5000–10 000 ftA2
NOTE
Section 5.8.2. Setting the personal/altitude adjustments describes
how the Altitude value is set.
61
WARNING
5.9.5. Personal adjustments
There are personal factors that can affect your susceptibility to DCI, which you can
predict in advance, and input into the decompression model. Such factors vary between
divers and also for the same diver from one day to another. There is available a threestep Personal Adjustment setting if a more conservative dive plan is desired.
The personal factors which tend to increase the possibility of DCI include, but are not
limited to:
cold exposure —water temperature less than 20 °C/68 °F
•
below average physical fitness level
•
fatigue
•
dehydration
•
previous history of DCI
•
stress
•
obesity
•
patent foramen ovale (PFO)
•
exercise on or after dive
•
62
Traveling to a higher elevation can temporarily cause a change
in the equilibrium of dissolved nitrogen in the body. It is recommended that you acclimatize to the new altitude by waiting at
least three (3) hours before diving.
This feature is used to adjust the computer to be more conservative, according to
personal preference, by entering the suitable Personal Adjustment setting with the
help of Table 5.7, Personal Adjustment settings. In ideal conditions, retain the default
setting, P0. If conditions are more difficult, or any of the factors which tend to increase
the possibility of DCI exist, select P1, or even the most conservative P2. The dive
computer then adjusts its mathematical model according to the entered Personal Adjustment setting, giving shorter no-decompression times (refer to Section 10.2.2. No-
decompression limits for air, Table 10.1, No-decompression time limits for various
depths (m) and Table 10.2, No-decompression time limits for various depths (ft)).
Table 5.7. Personal Adjustment settings
Personal adjustment value
P0
P1
P2
exist
Several risk factors or conditions exist
Desired tablesCondition
DefaultIdeal conditions
Progressively more conservativeSome risk factors or conditions
63
5.10. Safety Stops
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
WHEN STOP IS DISPLAYED,
MAKE A RECOMMENDED SAFETY
STOP FOR 3 MINUTES.
Safety Stops are widely considered good diving practice for recreational diving, and
are an integral part of most dive tables. The reasons for performing a Safety Stop include: reducing sub-clinical DCI, microbubble reduction, ascent control, and orientation
before surfacing.
The Suunto D4i displays two different types of Safety Stops: Recommended Safety
Stop and Mandatory Safety Stop.
5.10.1. Recommended Safety Stops
With every dive over 10 meters, there is a three-minute countdown for the Recommended Safety Stop, to be taken in the 3–6 m/10–20 ft range. This is shown with the STOP
sign and a three-minute countdown in the center window instead of the no-decompression time.
NOTE
64
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.
5.10.2. Mandatory Safety Stops
U
P
D
O
W
N
S
E
L
E
C
T
M
O
D
E
WHEN CEILING AND STOP ARE
DISPLAYED, MAKE A ONE MINUTE
MANDATORY SAFETY STOP IN THE
DEPTH ZONE BETWEEN 6 M AND 3 M.
When the ascent rate exceeds 10 m/33 ft per minute continuously for more than five
(5) seconds, the microbubble build-up is predicted to be more than is 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
depends on the severity of the ascent rate excess.
The STOP sign is shown in the display and when you reach the depth zone between
6 m and 3 m/20 ft and 10 ft, the CEILING label, ceiling depth, and the calculated Safety
Stop time also appear in the display. Wait until the Mandatory Safety Stop warning
disappears. 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. You should immediately descend to, or
below, the Mandatory Safety Stop ceiling depth. If you correct this situation at any
time during the dive, there are no effects on the decompression calculations for future
dives.
65
WHEN CEILING AND STOP ARE DISPLAYED
WITH DOWNWARD POINTING ARROW,
IMMEDIATELY (WITHIN 3 MINUTES) DESCEND
TO OR BELOW CEILING.
If you continue to violate the Mandatory Safety Stop, the tissue calculation model is
DURING DESCENT,
YOU'RE SHOWN THAT A
DEEPSTOP IS NEEDED AT
THE DEPTH OF 16 M.
DURING ASCENT, YOU'RE
ADVICED TO MAKE A DEEP
STOP AT 16 M FOR THE
DURATION SHOWN BY THE
TIMER (42 S REMAINING).
affected and the dive computer shortens the available no-decompression time for your
next dive. In this situation, it is recommended that you prolong your surface interval
time before your next dive.
5.11. Deep stops
Deep stops are safety stops that occur deeper than traditional stops, with the purpose
of minimizing microbubble formation and excitation.
The Suunto RGBM model calculates deep stops iteratively, placing the first stop about
halfway between the maximum depth and the ceiling depth. After the first Deep stop
is completed, another Deep stop will be prompted halfway to the ceiling, and so on
until the ceiling depth is reached.
66
If a deep stop is violated, it does not cause the dive computer to go into an error (Er)
mode. However, a penalty time is added to the subsequent decompression.
NOTE
With Deep Stops ON, the Recommended Safety Stops will still
be activated at the end of the dive.
67
6. DIVING
DIVE HAS JUST BEGUN AND
AVAILABLE NO-DECOMPRESSION
TIME IS OVER 99 MINUTES SO NO
VALUE IS DISPLAYED.
This section contains instructions on how to operate the dive computer and interpret
its displays. The dive computer is easy to use and read. Each display shows only the
data relevant to that specific diving mode.
6.1. Diving in the AIR mode (DIVE Air)
This section contains information on diving with standard air. To activate the DIVE Air
mode, please refer to Section 5.9.1. Accessing DIVE mode.
68
NOTE
NOTE
The dive computer will remain in the SURFACE mode at depths
less than 1.2 m/4 ft. At depths greater than 1.2 m/4 ft the instrument will go into the DIVE mode automatically. However, it is recommended that you activate the SURFACE mode manually
before entering the water in order to perform the necessary dive
pre-checks.
The default fields shown on your dive computer in the DIVE mode
are the ones you select while in the SURFACE mode.
6.1.1. Basic dive data
DIVE DISPLAY - PRESENT DEPTH IS 15 M,
NO-DECOMPRESSION STOP TIME LIMIT 46 MIN.
MAXIMUM DEPTH DURING THIS DIVE WAS 21.5 M,
ELAPSED DIVE TIME 22 MIN.
DOWN BUTTON TOGGLES
BETWEEN MAXIMUM DEPTH,
CURRENT TIME AND TANK
PRESSURE.
During a No-decompression dive, the following information is displayed:
your present depth in meters/feet
•
the available no-decompression time in minutes as NO DEC TIME
•
the ascent rate presented as a bar graph on the right side
•
Alternative displays, by pressing the UP/DOWN buttons, show:
the elapsed dive time in minutes, shown as DIVE TIME
•
the water temperature in °C/°F
•
the maximum depth during this dive in meters/feet, indicated as MAX
•
the current time, shown as TIME
•
69
UP BUTTON TOGGLES
BETWEEN DIVE TIME AND
WATER TEMPERATURE.
In addition, with the optional wireless transmission enabled:
A BOOKMARK IS PLACED
IN THE PROFILE MEMORY
DURING A DIVE BY PRESSING
THE SELECT BUTTON.
the Remaining Air time in the left center window indicated as AIR TIME (Air
•
Time must be set ON)
the cylinder pressure in bar (or psi) displayed in the lower left corner
•
the cylinder pressure graphically displayed on the left side
•
6.1.2. Bookmark
It is possible to record bookmarks in the profile memory during a dive. These bookmarks
are displayed when scrolling the profile memory on the display. The bookmarks are
also shown as annotations in the downloadable Suunto DM4 software.
To make a bookmark in the profile memory during a dive, press the SELECT button.
A brief confirmation will be given.
70
6.1.3. Tank pressure data
CURRENT TANK PRESSURE
IS 165 BAR AND THE REMAINING
AIR TIME IS 52 MINUTES.
When using the optional wireless pressure transmitter, the pressure of your scuba
cylinder in bars (or psi) is shown digitally in the lower left corner of the alternative display. Whenever you start 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 is shown in the left center window of the display. The calculation
is always based on the actual pressure drop in your cylinder and automatically adapts
to your cylinder size and current air consumption.
The change in your air consumption is based on constant one second interval pressure
measurements over 30–60 second periods. An increase in air consumption influences
the remaining air time rapidly, while a drop in air consumption increases the air time
slowly. In this way, an over 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 of pressure left in your cylinder, depending on your air consumption rate. With a
high consumption rate, the limit will be closer to 50 bar/700 psi and with a low rate
closer to 35 bar/500 psi.
71
NOTE
Filling your BCD affects the air time calculation due to the temporary increase in air consumption.
NOTE
NOTE
NOTE
Low Air Pressure Warnings
The dive computer will warn you with two (2) audible double beeps and a blinking
pressure display when the cylinder pressure reaches 50 bar/700 psi.
Two (2) double beeps are also heard when the cylinder pressure goes down to the
user-selected alarm pressure, and when the remaining time reaches zero.
6.1.4. Ascent rate indicator
The ascent rate is displayed graphically along the right hand side with a vertical bar.
When the maximum allowed ascent rate is exceeded, the lower segment of the bar
starts to blink with the top segment staying solid, indicating that the maximum ascent
rate has been exceeded.
72
The remaining air time is not displayed when either deep stops
or the decompression ceiling have been activated. You can recall
the remaining air time by long-pressing the DOWN button, but
the ceiling disappears.
A change of temperature will affect the cylinder pressure and
consequently the air time calculation.
If the air time is turned OFF, the air time is not displayed and no
alarm of air time reaching zero is issued.
Continuous ascent rate violations will result in Mandatory Safety Stops. When Recom-
NORMAL
ASCENT
RATE.
ACTIVATED BACKLIGHT, ALARM
AND A BLINKING ASCENT RATE BAR
GRAPH INDICATE YOU ARE ASCENDING
FASTER THAN 10 M/MIN. YOU ARE ADVISED
TO MAKE A MANDATORY SAFETY STOP
WHEN YOU REACH A DEPTH OF 6 M.
mended Deep Stop is enabled, the length is indicated in seconds.
WARNING
DO NOT EXCEED THE MAXIMUM ASCENT RATE! Rapid ascents increase the risk of injury. You should always make the
Mandatory and Recommended Safety Stops after you have exceeded the maximum recommended ascent rate. If this Mandatory
Safety Stop is not completed, the decompression model will
penalize your next dive(s).
6.1.5. Stopwatch (Timer)
You can also use a stopwatch during diving for various timing purposes. To activate
the stopwatch in the DIVE AIR or NITROX mode, long-press the MODE button, then
start and stop it by short-pressing the SELECT button.
73
6.1.6. Decompression dives
When your NO DEC TIME becomes zero, your dive changes into a decompression
dive. Therefore, you must perform one or more decompression stops on your way to
the surface. The NO DEC TIME on your display will be replaced by an ASC TIME,
and a CEILING notation will appear. An upward pointing arrow will also prompt you
to start your ascent.
If you exceed the no-decompression limits on a dive, the dive computer will provide
the 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 lets you
decompress within a range of depths (continuous decompression).
The ascent time (ASC TIME) is the minimum amount of time needed to reach the
surface in a decompression dive. It includes:
the time needed at the deep stop
•
the time needed to ascend to the ceiling at an ascent rate of 10 m/33 ft per minute.
•
The ceiling is the shallowest depth to which you should ascend.
the time needed at the ceiling
•
74
the time needed at the Mandatory Safety Stop (if any)
•
the time needed to reach the surface after the ceiling and Safety Stops have been
•
completed
WARNING
Ceiling, ceiling zone, floor and decompression range
When in decompression, it is important that you understand the meaning of ceiling,
floor, and decompression range.
The ceiling is the shallowest depth to which you should ascend when in decom-
•
pression. At this depth, or below, you must perform all stops.
The ceiling zone is the optimum decompression stop zone. It is the zone between
•
the minimum ceiling and 1.2 m/4 ft below the minimum ceiling.
The floor is the deepest depth at which the decompression stop time will not in-
•
crease. Decompression will start when you pass this depth during your ascent.
The decompression range is the depth range between the ceiling and floor. Within
•
this range, decompression takes place. However, it is important to remember that
the decompression will be very slow at, or close to, the floor.
YOUR ACTUAL ASCENT TIME MAY BE LONGER THAN DISPLAYED BY THE INSTRUMENT! The ascent time will increase
if you:
•
remain at depth
•
ascend slower than 10 m/33 ft per minute or
•
make your decompression stop deeper than at the ceiling
These factors will also increase the amount of air required to
reach the surface.
75
The depth of the ceiling and floor depends on your dive profile. The ceiling depth 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. Likewise, the floor and ceiling
may change upwards while you are decompressing.
When conditions are rough, it may be difficult to maintain a constant depth near the
surface. In such cases, it is more manageable to maintain an additional distance below
the ceiling, to ensure 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.
WARNING
76
NEVER ASCEND ABOVE THE CEILING! You must not ascend
above the ceiling during your decompression. In order to avoid
doing so by accident, you should stay somewhat below the ceiling.
Display below the floor
UPWARD POINTING ARROW, BLINKING ASC
TIME AND AN ALARM TELL YOU TO ASCEND.
MINIMUM TOTAL ASCENT TIME INCLUDING SAFETY
STOP IS 9 MINUTES. CEILING IS AT 3 M.
UPWARD POINTING ARROW HAS
DISAPPEARED AND ASC TIME LABEL HAS
STOPPED BLINKING, MEANING YOU ARE IN
THE DECOMPRESSION RANGE.
The blinking ASC TIME sign and an upward pointing arrow indicate that you are below
the floor. You should start your ascent immediately. The ceiling depth is shown on the
left side, and the minimum total ascent time on the right side of the center window.
Below is an example of a decompression dive without Deep Stops, below the floor.
Display above the floor
When you ascend above the floor, the ASC TIME sign stops blinking and the upward
pointing arrow disappears. Below is an example of a decompression dive above the
floor.
Decompression will now begin, but is very slow. Therefore, you should continue your
ascent.
77
Display at the ceiling zone
TWO ARROWS POINT AT EACH OTHER
“HOUR GLASS”. YOU ARE IN THE OPTIMUM CEILING
ZONE AT 3 M AND YOUR MINIMUM ASCENT TIME IS
9 MINUTES.
When you reach the ceiling zone, the display will show you two arrows pointing at
each other (the “hour glass” icon). Below is an example of a decompression dive at
the ceiling zone.
During the decompression stop, ASC TIME will count down towards zero. When the
ceiling moves upwards, you can ascend to the new ceiling. You may surface only after
the ASC TIME and CEILING labels have disappeared, which means that the decompression stop and any Mandatory Safety Stop have been completed. You are advised,
however, to stay until the STOP sign has also disappeared. This indicates that the
three (3) minute Recommended Safety Stop has also been completed.
Display above the ceiling
If you ascend above the ceiling during a decompression stop, a downward pointing
arrow will appear and a continuous beeping starts.
78
DECOMPRESSION DIVE, ABOVE CEILING.
NOTE DOWNWARD POINTING ARROW, ER WARNING
AND ALARM. YOU SHOULD IMMEDIATELY (WITHIN
3 MINUTES) DESCEND TO OR BELOW CEILING.
In addition, an Error warning (Er) reminds you that you have only three (3) minutes to
correct the situation. You must immediately descend to, or below, the ceiling.
If you continue to violate the decompression, the dive computer will go into a permanent
Error Mode. In this mode, the instrument can only be used as a depth gauge and timer.
You must not dive again for at least 48 hours (refer to Section 5.6. Error conditions).
6.2. Diving in NITROX mode (DIVE Nitrox)
The NITROX mode (DIVE Nitrox) is the second dive mode available in Suunto D4i
and is used when using oxygen-enriched gas mixtures.
6.2.1. Before diving in the NITROX mode
If set to the NITROX mode, the correct oxygen percentage of the gas in your cylinder
must always be entered into the computer to ensure correct nitrogen and oxygen
calculations. The dive computer adjusts its mathematical nitrogen and oxygen calculation models accordingly. 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
79
to be understated and will affect decompression calculations. If you want to adjust the
computer to provide more conservative calculations, use the personal adjustment
feature to affect decompression calculations, or reduce the PO2setting to affect oxygen
exposure according to the entered O2% and PO2values. Calculations based on nitrox
use result in longer no-decompression times and shallower maximum depths than
diving with air.
NOTE
When the dive computer is set in NITROX mode, the Dive Planning mode calculates
using the O2% and PO2values that are currently in the computer.
To set the nitrox mixes, refer to Section 5.8.1. Setting the nitrox values .
Default nitrox settings
In the NITROX mode, the Suunto D4i allows you to set a nitrox mix containing 21–50%
oxygen.
In the NITROX mode, the default setting is standard air (21% O2). It remains in this
setting until the O2% is adjusted to any other percentage of oxygen (22%–50%). 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.
6.2.2. Oxygen displays
When the NITROX mode is activated, the display will show the information in the figure
below. In the NITROX mode, the maximum operational depth is calculated based on
set O2% and PO2values.
80
As a safety precaution, the oxygen calculations in the dive computer are made with an oxygen percentage of 1% + set O2%.
NITROX DIVE MODE ACTIVATION.
MAXIMUM OPERATIONAL DEPTH BASED ON
SET O
2
% (21%) AND PO2 (1.4 BAR) IS 53.6 M.
If set to the NITROX mode, the Suunto D4i will additionally show on the alternative
DOWN BUTTON
TOGGLES BETWEEN
O
2
, MAXIMUM DEPTH
CURRENT TIME AND
TANK PRESSURE.
display:
the oxygen percentage, labeled O2%
•
the set oxygen partial pressure limit, labeled PO
•
the current oxygen toxicity exposure, labeled OLF%
•
maximum depth
•
current time
•
water temperature
•
dive time
•
tank pressure
•
2
81
UP BUTTON
TOGGLES BETWEEN
PO
2
, OLF%, DIVE
TIME AND WATER
TEMPERATURE.
6.2.3. Oxygen limit fraction (OLF%)
If set to the NITROX mode, in addition to tracking the diver's exposure to nitrogen, the
instrument tracks the exposure to oxygen. These calculations are treated as entirely
separate functions.
The dive computer calculates separately for Central Nervous System oxygen toxicity
(CNS) and Pulmonary Oxygen toxicity, the latter measured by the addition of Oxygen
Toxicity Units (OTU). Both fractions are scaled so that the maximum tolerated exposure
for each is expressed as 100%.
The Oxygen Limit Fraction (OLF%) displays only the value of the higher of the two
calculations. The oxygen toxicity calculations are based on the factors listed in Sec-
tion 10.3. Oxygen exposure.
6.3. Diving in the FREE mode (DIVE Free)
If set to the FREE mode, the dive computer can be used as a free diving instrument.
In the FREE mode, the total dive time is always displayed in minutes and seconds
(mm:ss) in the center window.
82
The free dive ends as soon as you surface (at 0.5 m/ 1.6 ft).
NOTE
NOTE
6.3.1. Day History
The Day History function shows the free dive history of your latest diving day. In the
SURFACE mode you can enter the Day History by pressing the SELECT button.
The FREE mode does not provide decompression information.
There is no ascent rate monitoring in the FREE mode.
83
The Day History function shows the average depth of all dives, the deepest depth of
the day as well as the time, the longest dive, and the cumulative dive time in hours
and minutes, as well as the number of dives made during the day.
NOTE
6.3.2. Free dive time limit
The FREE mode has a time limit of 10 minutes. After 10 minutes, Suunto D4i will
automatically change from Free Dive to Scuba Bottom Timer. After the dive, the nofly time will countdown from 48 hours. Also, you will not be able to dive in AIR or NITROX modes until the no-fly time has counted down to zero. You can only set the
DIVE mode to OFF.
NOTE
84
The first dive of the next day will reset the Day History function
and start a new one.
If you want to dive in AIR or NITROX mode after diving in FREE
mode, remember to switch to the correct mode. Otherwise, the
free dive time limit will activate after 10 minutes.
7. AFTER DIVING
IT IS 6 MINUTES SINCE YOU SURFACED FROM A 35-MINUTE DIVE.
THE MAXIMUM DEPTH WAS 21.5 M. THE PRESENT DEPTH IS 0.0 M. THE
AIRPLANE SYMBOL AND NO-FLY VALUE INDICATE THAT YOU SHOULD NOT FLY
FOR 14 HOURS, 28 MINUTES. THE DIVER ATTENTION SYMBOL INDICATES THAT
YOU SHOULD PROLONG YOUR SURFACE INTERVAL TIME.
Once back at the surface, Suunto D4i continues to provide post-dive safety information
and alarms. Calculations to enable repetitive dive planning also help to maximize diver
safety.
Table 7.1. Alarms
IndicationSymbol on display
Diver Attention Symbol - Extend Surface Interval
Violated Decompression Ceiling or Too Long Bottom
Time
Do Not Fly Symbol
7.1. Surface interval
An ascent to any depth shallower than 1.2 m/4 ft (0.5 m/1.6 ft in FREE mode) will
cause the DIVE display to be replaced by the SURFACE display:
85
Or, in the alternative displays, the following information will be shown:
maximum depth of last dive in meters/feet
•
dive time of last dive in minutes, shown as DIVE TIME
•
the current time, shown as TIME
•
the current temperature in °C/°F
•
cylinder pressure in bar/psi (if enabled)
•
If set to NITROX mode, the following information will also be shown:
• the oxygen percentage labeled O2%
• the oxygen partial pressure labeled PO
• the current oxygen toxicity exposure labeled OLF%
2
7.2. Dive numbering
Several repetitive dives are considered to belong to the same repetitive dive series
when the dive computer has not counted the no-fly time to zero. Within each series,
the dives are given individual numbers. The first dive of the series will be numbered
as DIVE 1, the second as DIVE 2, the third as DIVE 3, and so on.
If you start a new dive with less than five (5) minutes of surface interval time, the dive
computer interprets this as a continuation of the previous dive and the dives are considered to be the same. The diving display will return, the dive number will remain
unchanged, and the dive time will begin where it left off. After five (5) minutes on the
surface, subsequent dives are, by definition, repetitive. The dive counter displayed in
the Planning mode will increment to the next number if another dive is made.
86
7.2.1. FREE Dive
Each dive series includes dives that have been performed during one day. The day's
dive numbering and latest dive information resets to 0 at midnight, and each day there
is a new series of dives that is recorded in the log book.
The dive is completed once you ascend beyond 0.5 m. A new dive will be registered
in the log book immediately you descend once again.
7.3. Repetitive dive planning
The Suunto D4i includes a dive planner that allows you to review the no-decompression
limits on a subsequent dive, taking the residual nitrogen loading of previous dives into
consideration. The DIVE PLANNING mode is explained in Section 7.5. DIVE PLAN-
NING mode (PLAN NoDec).
7.4. Flying after diving
In the DIVE mode, the no-fly time is displayed in the center window next to the airplane
image. In the TIME mode, the airplane image is shown in the top left corner. The nofly time is displayed on the bottom row. Flying or traveling to a higher altitude should
be avoided at any time when the computer is counting down the no-fly time.
The no-fly time is always at least 12 hours, or equivalent to the so-called desaturation
time (if longer than 12 hours). For desaturation times lower than 70 minutes, no nofly time is given.
In the Permanent Error mode and GAUGE mode (if the free dive has exceeded 10
minutes), the no-fly time is 48 hours.
The Divers Alert Network (DAN) recommends the following on no-fly times:
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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 2,400 m/8,000 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 a flight. Further, the Undersea and Hyperbaric Medical Society (UHMS) suggests divers using standard air cylinders and
exhibiting no symptoms of decompression illness wait 24 hours after their last dive
to fly in an aircraft with cabin pressure up to 2,400 m/8,000 ft. The only two exceptions to this recommendation are:
If a diver has less than two (2) hours total accumulated dive time in the last 48
•
hours, 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 is avoided until all the DAN and UHMS guidelines,
•
as well as the dive computer’s no-fly conditions, are satisfied.
7.5. DIVE PLANNING mode (PLAN NoDec)
The DIVE PLANNING mode displays no-decompression times for a new dive, taking
into account the effects of previous dives.
When entering the DIVE PLANNING mode (PLAN NoDec) mode, the display first
briefly shows the remaining desaturation time before going into plan mode.
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By pressing the UP/DOWN buttons, you can scroll the no-decompression limits in 3
WHEN ENTERING THE PLAN MODE THE DISPLAY FIRST BRIEFLY SHOWS THE
REMAINING DESATURATION TIME BEFORE GOING INTO PLAN MODE. USE UP AND
DOWN BUTTONS TO SCROLL NO-DECOMPRESSION LIMITS AT DIFFERENT DEPTHS.
YOU CAN ALSO ADJUST YOUR SURFACE INTERVAL TIME TO YOUR PLAN.
NO-DECOMPRESSION LIMITS LONGER THAN 99 MINUTES ARE DISPLAYED AS “–”.
m/10 ft increments ending at 45 m/150 ft. No-decompression limits longer than 99
minutes are displayed as “—“. During a dive series (between two consecutive dives)
it is also possible to enter the surface interval time as a planning parameter.
The Planning mode takes into account the following information from previous dives:
any calculated residual nitrogen
•
all dive history for the past four days
•
The no-decompression times given for different depths will therefore be shorter than
before your first “fresh” dive.
You can exit the DIVE PLANNING mode by pressing the MODE button.
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NOTE
Higher Altitude and conservative Personal Adjustment settings will shorten the nodecompression time limits. These limits at different Altitude and Personal Adjustment
setting selections are explained in Section 5.9.4. Diving at altitude and in Section 5.9.5.
Personal adjustments.
7.5.1. 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.
The surface interval must be at least five (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. (Refer also to
Section 7.2. Dive numbering ).
7.6. MEMORY mode
The memory options in the MEMORY mode include dive logbook (MEM Logbook)
and dive history (MEM History). They are accessed from the DIVE mode and you can
toggle between them by using the UP/DOWN buttons.
The dive entry time and date is registered in the Logbook memory. Always check before
diving that the time and date are correctly set, especially after travelling between different time zones.
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The DIVE PLANNING mode is disabled in FREE mode and in
Error mode (see Section 5.6. Error conditions).
7.6.1. Dive logbook (MEM Logbook)
THERE ARE THREE PAGES OF LOGBOOK DIVE INFORMATION. USE
SELECT BUTTON TO SCROLL BETWEEN LOGBOOK PAGES I, II, AND III.
THE DATA OF THE MOST RECENT DIVE IS SHOWN FIRST. YOU CAN
SCROLL THE GRAPHICAL DIVE PROFILE ON PAGE III WITH UP BUTTON.
The Suunto D4i has a very sophisticated, high capacity Logbook and Profile Memory.
The data is recorded in the profile memory based on the selected sample rate.
The END OF LOGS text is displayed between the oldest and most recent dive. The
following information will be shown on three pages:
Page I, main display
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maximum depth
•
date of dive
•
type of dive (AIR, NITROX, FREE, bottom timer (G))
•
dive start time
•
dive number
•
oxygen percentage
•
total dive time (in minutes in AIR and NITROX modes, and minutes and seconds
•
in FREE mode)
Page II
maximum depth
•
average depth
•
consumed pressure (if enabled)
•
warnings
•
Page III
graphical dive profile
•
water temperature
•
tank pressure (if enabled)
•
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NOTE
Memory capacity depends on the selected sample rate. With
factory default setting (20 s) and without transmitter data the capacity is approximately 140 hours. With transmitter data the capacity is minimum 35 hours. In Dive Free mode the maximum
memory capacity is 35 hours. After that, when new dives are added, the oldest dives are deleted. The contents of the memory
will remain when the battery is changed (providing that the battery
has been replaced according to the instructions).
NOTE
NOTE
7.6.2. Dive history (MEM History)
The dive history is a summary of all the dives recorded by the dive computer.
You can view both your scuba and free dive history.
Scuba History
The Scuba History can hold a maximum of 999 dives and 999 diving hours. When
these maximum values are reached, the counters will start again from zero.
Several repetitive dives are considered to belong to the same
repetitive dive series if the no-fly time has not ended. See Section 7.2. Dive numbering for further information.
Depending on the sampling rate, the maximum depth reading
may differ from the maximum depth reading of the Dive History
up to 0.3 m/1 ft.
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SCUBA DIVE HISTORY DISPLAY.
TOTAL NUMBER OF DIVES, DIVE
HOURS AND MAXIMUM DEPTH.
NOTE
You can reset the maximum depth of scuba dives to 0.0 m/0 ft
with the PC-Interface cable and the downloadable Suunto DM4
software.
Free Dive History
The Free Dive History shows the deepest and the longest dives of all free dives, and
the cumulative dive time in hours and minutes, as well as the total number of dives.
The Free Dive History can hold a maximum of 999 dives and 99 diving hours 59
minutes. When these maximum values are reached, the counters will start again from
zero.
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The Free Dive history gathers history of the entire sequence of free dives. Unlike the
day history, the Free Dive History is not reset.
7.7. Suunto DM4
The Suunto DM4 is an optional software that greatly enhances the functionality of your
Suunto D4i. With the DM4 software, you can download dive data from your dive
computer to your laptop. After that, you can view and organize all the data recorded
with your Suunto D4i. You can plan dives (with Suunto Dive Planner), print copies of
your dive profiles, and also upload your dive logs to share with your friends at ht-
tp://www.movescount.com (see Section 7.8. Movescount). You can always download
the latest version of the DM4 from http://www.suunto.com. Please check for updates
regularly as new features are constantly being developed. The following data is
transferred from your dive computer to your laptop (optional, cable required):
• depth profile of the dive
• dive time
• preceding surface interval time
• dive number
• dive start time (year, month, day, and time)
• dive computer settings
• oxygen percentage settings and maximum OLF (in the NITROX mode)
• tissue calculation data
• real-time water temperature
• tank pressure data (if enabled)
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• additional dive information (for example, SLOW and Mandatory Safety Stop violations, Diver Attention Symbol, Bookmark, Surfaced Mark, Decompression Stop
Mark, and Ceiling Error Mark)
• dive computer serial number
• personal information (30 characters)
By using the DM4, you are able to enter setup options such as:
input a personal, 30-character field into the Suunto instrument.
•
manually add comments, multimedia and other personal information to the PC-
•
based dive data files
7.8. Movescount
Movescount is an online sports community that offers you a rich set of tools to manage
all you sports and create engaging stories about your diving experiences. Movescount
offers you new ways to get inspired and share your best dives with other community
members!
To connect to Movescount:
Go to www.movescount.com.
1.
Register and create your free Movescount account.
2.
Download and install the Suunto DM4 software from the Movescount.com website
3.
if you do not already have the DM4 installed on your laptop
To transfer data:
Connect your dive computer to your laptop.
1.
Download your dives to the DM4 on your laptop.
2.
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Follow the instructions on the DM4 on how to transfer your dives to your
3.
Movescount.com account.
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8. CARE AND MAINTENANCE OF MY SUUNTO DIVING COMPUTER
The SUUNTO dive computer is a sophisticated precision instrument. Although it is
designed to withstand the rigors of scuba diving, you must treat it with the same
proper care and caution as any other precision instrument.
WATER CONTACTS AND PUSH BUTTONS
•
Contamination or dirt on the water contacts/connector or push buttons may prevent
the automatic activation of the Dive Mode and cause problems during the data
transfer. Therefore, it is important that the water contacts and push buttons are
kept clean. If the water contacts are active (AC text remains on display) or the Dive
Mode activates on its own, the reason for this is probably contamination or invisible
marine growth, which may create an electric current between the contacts. It is
important that the dive computer is carefully washed in fresh water after the day’s
diving is completed. The contacts can be cleaned with fresh water and, if necessary,
a mild detergent and a soft brush. Sometimes it might be necessary to remove the
instrument from the protective boot for cleaning.
CARE OF YOUR DIVE COMPUTER
•
NEVER try to open the case of the dive computer.•
• Have your dive computer serviced every two years or after 200 dives (whichever
comes first) by an authorized SUUNTO service center. This service will include
a general operational check, replacement of the battery, and water resistance
check. The service requires special tools and training. Do not attempt to do any
servicing that you are not sure of.
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• Should moisture appear inside the case, immediately have the instrument
checked by your SUUNTO service center.
• The specific scratch guard for D4i is designed to help the display from getting
scratched. They can be purchased separately from your nearest retailer. The
scratch guard is easy to attach and also to replace if needed (for more information, see the instructions on www.suunto.com).
• Should you detect scratches, cracks or other such flaws on the display that
may impair its durability, immediately have it replaced by your SUUNTO dealer
or distributor.
• Wash and rinse the unit in fresh water after every use.
• Protect the unit from shock, extreme heat, direct sunlight, and chemical attack.
The dive computer cannot withstand the impact of heavy objects like scuba
cylinders, nor chemicals like gasoline, cleaning solvents, aerosol sprays, adhesive agents, paint, acetone, alcohol, and so on. Chemical reactions with such
agents will damage the seals, case and finish.
• Store your dive computer in a dry place when you are not using it.
• The dive computer will display a battery symbol as a warning when the power
gets too low. When this happens, the instrument should not be used until the
battery has been replaced.
• Do not fasten the strap of your dive computer too tightly. You should be able
to insert your finger between the strap and your wrist.
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MAINTENANCE
•
The instrument should be soaked, thoroughly rinsed with fresh water, then dried
with a soft towel after each dive. Make sure that all salt crystals and sand particles
have been flushed out. Check the display for possible moisture or water. DO NOT
use the dive computer if you detect any moisture or water inside. Contact an authorized Suunto service center for battery replacement or other service.
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 dive computer in pressurized air.
WATER RESISTANCE INSPECTION
•
The water resistance of the unit must be checked after replacing the battery or
after other service operations. The check requires special equipment and training.
You must frequently check the display for any sign of leaks. If you find moisture
inside your dive computer, there is a leak. A leak must be corrected without delay
as moisture may seriously damage the unit, even beyond repair. SUUNTO does
not take any responsibility for damage caused by moisture in the dive computer
unless the instructions of this manual are carefully followed. In the event of a leak,
immediately take the dive computer to an authorized SUUNTO service center.
FAQs
For more information on service, please refer to FAQs on www.suunto.com.
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9. BATTERY REPLACEMENT
NOTE
CAUTION
All history and profile data, as well as the altitude, personal, and alarm settings, will
remain in the dive computer memory after the battery change. However, the clock
time and time alarm settings are lost. In the NITROX mode, the nitrox settings also
revert back to default settings (Mix1 21% O2, 1.4 bar PO2).
9.1. Wireless transmitter battery replacement
NOTE
It is advisable to contact an authorized Suunto service center 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 or computer.
When the battery is changed, all nitrogen and oxygen uptake data
is lost. Therefore, the no-fly time shown by the computer should
have reached zero or you must wait for 48 hours, or preferably
up to 100 hours, before you dive again.
It is advisable to contact an authorized Suunto service center 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.
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