Suunto Mosquito User manual

Valimotie 7
FIN-01510 Vantaa, Finland
Tel. [phone]
Fax [phone]
www.suunto.com
Mosquito
Dive Computers
INSTRUCTION MANUAL

O
L
F
A
S
C
scuba
dive
history
data
transfer
p2
p3
p1
p2
free
dive
history
p3
p2
p3
logbook
delay
p1 p1
End
End
altitude &
personal &
unit
adjustment
free dive &
scuba dive
& oxygen
settings
daily alarm
time&date
dive alarms
/
/
dive
planning
nitrox
display
lcd & battery
check
scuba
surface
scuba
diving
O2%
max. depth
temp.
PO2
dive time
time
free
surface
free
diving
lcd & battery
check
day
history
FREE dive
ON
AIR dive
ON
EAN dive
ON
or
delay
delay
max. depth
temp.
dive time
time
dive no
time
keeping
stopwatch
date
seconds
dual time
delay
QUICK REFERENCE GUIDE MODES AND OPERATIONS
MODES AND OPERATIONS
mode
light
exit
SELECT
select
next
MODE
Present Depth
Maximum Depth
Average Depth in Logbook
Fast Ascent Warning
(SLOW)
AC Indicator
Do Not Fly Icon
Bar Graph:
- Ascent Rate
- Battery Power
- Mode Indicator
Diver Attention Symbol
Temperature
Maximum Depth
Mode Text
Oxygen Percentage in Nitrox
Mode
Week Day
Timer Hours and Minutes
Low Battery Warning
Altitude Adjustment
Mode
Personal Adjustment
Mode
Safety Stop Warning
Safety Stop Indicator
Bar Graph:
- Mode Indicator
- Oxygen Limit Fraction
Daily Alarm
On Indicator
Dive Time
Dive Counter
Oxygen Partial Pressure
in Nitrox Mode
Time
Dual Time
Day, Month
Timer Seconds
Oxygen Partial Pressure
Dive Alarm
On Indicator
Current Time Display
No-Decompression Time
Surface Interval Time
No Flying Time
Total Ascent Time
Ceiling Depth on Decompression Stop
Safety Stop Time
Mandatory Safety Stop Depth and Time
AM/PM Indicator
Arrows:
- Decompression Stop
at the Ceiling Depth
- Mandatory Safety Stop Zone
- Ascent Recommended
- Must Descend

1
DEFINITION OF WARNINGS, CAUTIONS AND NOTES
Throughout this manual, special re erences are made when deemed important.
Three classi ications are used to separate these re erences by their order o
importance.
WARNING - is used in connection with a procedure or situation that may
result in serious injury or death.
CAUTION - is used in connection with a procedure or situation that will
result in damage to the product.
NOTE - is used to emphasize important in ormation.
COPYRIGHT, TRADEMARK AND PATENT NOTICE
This instruction manual is copyrighted and all rights are reserved. It may not, in
whole or in part, be copied, photocopied, reproduced, translated, or reduced to
any media without prior written consent rom SUUNTO.
SUUNTO, MOSQUITO, Consumed Bottom Time (CBT), Oxygen Limit Fraction
(OLF), SUUNTO Reduced Gradient Bubble Model (RGBM), Continuous
Decompression and their logos are all registered or unregistered trademarks o
SUUNTO. All rights are reserved.
Patents have been issued or applied or one or several eatures o this product.
CE
The CE mark is used to mark con ormity with the European Union EMC directive
89/336/EEC. The SUUNTO dive instruments ul ill all the required EU directives.

2
FIOH, Laajaniityntie 1, FIN-01620 Vantaa, Finland, noti ied body no.0430, has
EC type-examined this type o personal protective equipment.
This instrument must be serviced by an authorized dealer every second year or
a ter 200 dives (whichever comes irst). See chapter 6.
PrEN 13319
PrEN 13319 Diving accessories  Depth gauges and combined depth and time
measuring devices  Functional and sa ety requirements, test methods is a
European diving depth gauge standard dra t. The MOSQUITO is designed to
comply with this dra t standard.
ISO 9001
SUUNTO Oys Quality Assurance System is certi ied by Det Norske Veritas to
be according to the ISO 9001 in all SUUNTO Oys operations (Quality Certi icate
No. 96-HEL-AQ-220).
SUUNTO Oy does not assume any responsibility or losses or claims by third
parties, which may arise through the use o this device.
Due to continuous product development, the MOSQUITO is subject to change
without notice.

3
WARNING
Read this manual. Care ully read this instruction manual in its entirety paying
close attention to all warnings listed below, including chapter 1.1. Sa ety
Precautions. Make sure that you ully understand the use, displays and
limitations o the dive computer because any con usion resulting rom
neglecting to ollow this instruction manual or rom improper use o this
device may cause a diver to commit errors that may lead to serious injury or
death.
WARNING
Not or pro essional use. Suunto dive computers are intended or recreational
use only. The demands o commercial or pro essional diving may expose the
diver to depths and exposures that tend to increase the risk o decompression
illness (DCI). There ore, Suunto strongly recommends that the device be not
used or commercial or pro essional diving activity.
WARNING
Only divers trained in the proper use o scuba diving equipment should use a
dive computer. No dive computer can replace the need or proper dive training.
Insu icient or improper training may cause diver to commit errors that may
lead to serious injury or death.

4
WARNING
There is always a risk o decompression illness (DCI) or any dive pro ile
even i you ollow the dive plan prescribed by dive tables or a dive computer.
No procedure, dive computer or dive table will prevent the possibility o DCI
or oxygen toxicity. An individuals physiological make up can vary rom day
to day. The dive computer cannot account or these variations. You are
strongly advised to remain well within the exposure limits provided by the
instrument to minimize the risk o DCI. As an added measure o sa ety, you
should consult a physician regarding your itness be ore diving.
WARNING
Suunto strongly recommends that sport divers limit their maximum depth to
40 m [130 t] or to the depth calculated by the computer based on the selected
O2% and a maximum PO2 o 1.4 bar settings.
WARNING
Dives with required decompression stops are not recommended. You should
ascend and begin decompression immediately when the dive computer shows
you that a decompression stop is required. Note the blinking ASC TIME
symbol and the upward pointing arrow.
WARNING
Use back-up instruments. Make sure that you use back-up instrumentation
including a depth gauge, submersible pressure gauge, timer or watch, and
have access to decompression tables whenever diving with a dive computer.

5
WARNING
Per orm pre-checks. Always activate and check the device be ore diving in
order to ensure that all Liquid Crystal Display (LCD) segments are completely
displayed, that the device has not run out o battery power, and that the
oxygen, altitude and personal adjustments are correct. Also, exit the Data
Trans er mode be ore diving, as the computer does not automatically revert to
Dive mode rom Data Trans er mode.
WARNING
You are advised not to ly any time the computer counts down the no- lying
time. Always activate the computer to check the remaining no- ly time prior
to lying. The computer goes into the stand-by display automatically 5 minutes
a ter sur acing. Flying or traveling to a higher altitude within no- ly time can
greatly increase the risk o DCI. Review the recommendations given by
Divers Alert Network (DAN) in chapter 3.2.3.4. Flying A ter Diving. There
can never be a lying a ter diving rule that is guaranteed to completely prevent
decompression illness!
WARNING
The dive computer should never be traded or shared between users while it is in
operation. Its in ormation will not apply to someone who has not been wearing
it throughout a dive or sequence o repetitive dives. Its dive pro iles must match
that o the user. I it is le t on the sur ace during any dive, it will give inaccurate
in ormation or subsequent dives. No dive computer can take into account dives
made without the computer. Thus any diving activity up to our days prior to
initial use o the computer may cause misleading in ormation and must be avoided.

6
WARNING
Do not dive with a cylinder o enriched air i you have not personally veri ied
its contents and entered the analyzed value into your dive computer. Failure
to veri y cylinder contents and enter the appropriate O2% into your dive
computer will result in incorrect dive planning in ormation.
WARNING
The dive computer will not accept ractional percentage values o oxygen
concentration. Do not round up ractional percentages. For example, 31.8%
oxygen should be entered as 31%. Rounding up will cause nitrogen
percentages to be understated and will a ect decompression calculations. I
there is a desire to adjust the computer to provide more conservative
calculations, use the personal adjustment eature to a ect decompression
calculations or reduce the PO2 setting to a ect oxygen exposure.
WARNING
Set the correct Altitude Adjustment Mode when diving at altitudes greater
than 300 m [1000 t] the Altitude Adjustment eature must be correctly
selected in order or the computer to calculate the decompression status. The
dive computer is not intended or use at altitudes greater than 3000 m [10000 t].
Failure to select the correct Altitude Adjustment setting or diving above the
maximum altitude limit will result in erroneous dive and planning data.

7
WARNING
Set the correct Personal Adjustment Mode. Whenever it is believed that actors
that tend to increase the possibility o 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
Freediving a ter scuba diving is not recommended. It is recommended to avoid
reediving or at least two hours and not to exceed ive meters [16 t] a ter
scuba diving depending on your diving activity.
Suunto also recommends you to be trained in reediving technique and
physiology be ore conducting breath holding dives. No dive computer can
replace the need or proper dive training. Insu icient or improper training
may cause diver to commit errors that may lead to serious injury or death.
NOTE:
Changing rom AIR to EAN mode is possible at any time. Changing rom EAN
to AIR mode however requires you to wait until the no- lying time has counted
down. FREE mode is accessible at any time.
FREE mode is limited to 5 minutes, a ter which a warning is given. A ter 5+1
minutes the computer goes into error mode.

8
TABLE OF CONTENTS
1. INTRODUCTION ........................................................................................ 12
1.1. SAFETY PRECAUTIONS ................................................................... 13
1.1.1. Emergency Ascents ..................................................................... 14
1.1.2. Dive Computer Limitations ......................................................... 15
1.1.3. Nitrox .......................................................................................... 15
1.1.4. Freediving ................................................................................... 15
2. GETTING ACQUAINTED .......................................................................... 17
2.1. FUNCTIONS ........................................................................................ 17
2.2. PUSH BUTTONS ................................................................................. 17
2.3. WATER CONTACTS ............................................................................ 19
2.4. TIME MODE [TIME] ........................................................................... 20
2.4.1. Timekeeping Display .................................................................. 20
2.4.2. Stopwatch [Timer] ....................................................................... 21
3. DIVING WITH THE MOSQUITO .............................................................. 23
3.1 BEFORE DIVING ................................................................................. 24
3.1.1. Activation and Pre-checks ........................................................... 24
3.1.2. Battery Power Indicator and Low Battery Warning .................... 26
3.1.3. User De inable Functions and Alarms ........................................ 28
3.1.3.1. Presetting Time Alarm .................................................... 29
3.1.3.2. Presetting Dive Alarms .................................................. 29
3.1.4. Bookmark Function ..................................................................... 29
3.2. SCUBA DIVING .................................................................................. 30

9
3.2.1. Diving with Air ........................................................................... 30
3.2.1.1. Dive Planning [PLAN] ................................................... 30
3.2.1.2. Presetting the Displays in the Air mode ......................... 32
3.2.1.3. Basic Dive Data .............................................................. 32
3.2.1.4. Sa ety stops ................................................................... 34
3.2.1.4.1. Recommended Sa ety Stop ................................. 35
3.2.1.4.2. Mandatory Sa ety Stop ........................................ 35
3.2.1.5. Ascent Rate Indicator ..................................................... 37
3.2.1.6. Decompression dives ..................................................... 39
3.2.2. Diving with EAN (Nitrox) .......................................................... 45
3.2.2.1. Be ore Diving ................................................................. 45
3.2.2.2. Presetting the Displays in the EAN mode ...................... 46
3.2.2.3. Oxygen Displays ............................................................ 47
3.2.2.4. Oxygen Limit Fraction (OLF) ........................................ 48
3.2.3. At the Sur ace .............................................................................. 49
3.2.3.1. Sur ace Interval a ter an Air/EAN Dive ......................... 49
3.2.3.2. Diver Attention Symbol ................................................. 51
3.2.3.3. Dive Numbering ............................................................. 51
3.2.3.4. Flying A ter Diving ........................................................ 52
3.2.4. High Altitude Dives and Personal Adjustment ............................. 53
3.2.4.1. Altitude Adjustment ....................................................... 53
3.2.4.2. Personal Adjustment ....................................................... 55
3.2.5. Error Conditions ......................................................................... 57
3.3. FREEDIVING ....................................................................................... 58

10
3.3.1. Be ore Diving in the Free mode .................................................. 58
3.3.2. Presetting the Displays in the Free mode .................................... 58
3.3.3. During the Freedive ..................................................................... 59
3.3.4. Freediving Day History ............................................................... 59
3.3.5. Exceeding the Freediving Time Limit ......................................... 60
3.3.6. Sur ace Interval A ter a Freedive ................................................ 61
3.4. AUDIBLE AND VISUAL ALARMS ................................................... 62
4. SETTING MODE [SET] .............................................................................. 65
4.1. SETTING TIME, DATE AND DUAL TIME [TIME ] ........................ 65
4.2. DAILY ALARM SETTING [ALM] ..................................................... 67
4.3. DIVE MODE SETTINGS [DIVE] ....................................................... 69
4.3.1. Set Air Mode ............................................................................... 69
4.3.2. Set EAN Mode ............................................................................ 71
4.3.3. Set Free Mode ............................................................................. 72
4.4. DIVE ALARM SETTINGS [DIVE AL] ............................................ 73
4.5. ALTITUDE, PERSONAL AND UNIT ADJUSTMENT SETTINGS ......
[AdJ] ..................................................................................................... 75
5. MEMORIES AND DATA TRANSFER [MEM] .......................................... 77
5.1. LOGBOOK AND DIVE PROFILE MEMORY [LOG] ....................... 78
5.2. DIVE HISTORY MEMORY [HIS] ...................................................... 83
5.3. DATA TRANSFER AND PC-INTERFACE [TR-PC] .......................... 84
6. CARE AND MAINTENANCE ................................................................... 87
6.1. CARE OF YOUR MOSQUITO ............................................................ 87
6.2. MAINTENANCE ................................................................................. 88

11
6.3. WATER RESISTANCE INSPECTION ................................................ 89
6.4. BATTERY REPLACEMENT ............................................................... 90
7. TECHNICAL DESCRIPTION .................................................................... 93
7.1. OPERATING PRINCIPLES ................................................................. 93
7.2. REDUCED GRADIENT BUBBLE MODEL, SUUNTO RGBM ....... 96
7.3. OXYGEN EXPOSURE ........................................................................ 98
7.4. TECHNICAL SPECIFICATION ........................................................ 100
8. WARRANTY ............................................................................................. 105
9. GLOSSARY ............................................................................................... 107

12
1. INTRODUCTION
Congratulations on your purchase o the SUUNTO MOSQUITO advanced
wristop dive computer. The Mosquito builds on the Suunto tradition o delivering
eature-rich dive computers, providing di erent operating modes or di erent
types o diving. Push button controls access a wide selection o choices. The
display is optimized or the dive mode chosen and it incorporates a patented user
de inable display ield. This dive computer is a compact and sophisticated
multipurpose dive instrument, designed to give you years o trouble- ree usage.
CHOICE OF DIVING AND WATCH MODES
User options or the Mosquito are selected using the push buttons.
Pre dive con iguration and setup options include:
 Choice o operating mode  Air / Nitrox / Freediving
 Maximum depth alarm
 Dive time alarm
 Oxygen raction % (Nitrox mode only)
 Oxygen partial pressure alarm limit (Nitrox mode only)
 Altitude adjustment
 Personal adjustment
 Choice o unit  Metric / Imperial
 Clock, calendar, daily alarm, stopwatch, dual time
 User de inable display ields

13
CONTINUOUS DECOMPRESSION WITH SUUNTO RGBM
The Suunto Reduced Gradient Bubble Model (RGBM) utilized in the Mosquito
predicts both dissolved and ree gas in blood and tissues o divers. It is a
signi icant advance on the classic Haldane models, which do not predict ree gas.
The advantage o Suunto RGBM is additional sa ety through its ability to adapt
to a variety o situations and dive pro iles.
In order to optimize how to respond to di erent added risk situations an additional
category o stop, re erred to as a Mandatory Sa ety Stop, has been introduced. Also
a countdown or the Recommended Sa ety Stop is included. The combination o
stop types will depend on the speci ic dive situation.
To get the most rom the sa ety bene its be sure to read the summary o the Suunto
Reduced Gradient Bubble Model in chapter 7.2.
1.1. SAFETY PRECAUTIONS
Do not attempt to use Mosquito without reading this instruction manual in its
entirety, including all the warnings. Make sure that you ully understand the use,
displays and limitations o the instrument. I you have any questions about the
manual or the dive computer, contact your SUUNTO dealer be ore diving with the
dive computer.
Always remember that you are responsible or your own sa ety.
When used properly, the dive computer is an outstanding tool or assisting properly
trained, certi ied divers in planning and executing sport dives. It is not a substitute
or certi ied scuba instruction, including training in the principles o decompression.

14
Diving with enriched air mixtures (nitrox) exposes the user to risks di erent rom
those associated with diving with standard air. These risks are not obvious and
require training to understand and avoid. Risks include possible serious injury or
death.
Do not attempt to dive with any gas mix other than standard air without irst
receiving certi ied training in this specialty.
1.1.1. EMERGENCY ASCENTS
In the unlikely event that Mosquito mal unctions during a dive, ollow the
emergency procedures provided by your certi ied dive training agency or,
alternatively,
STEP 1: Assess the situation calmly and then move promptly to less than 18
m [60 t].
STEP 2: At 18 m [60 t], slow down your ascent rate to 10 m/min [33 t/min]
and move to a depth between 3 and 6 meters [10 to 20 t].
STEP 3: Stay there as long as you assess your air supply will sa ely allow. A ter
reaching the sur ace stay out o the water or at least 24 hours.
1.1.2. DIVE COMPUTER LIMITATIONS
While the dive computer is based on current decompression research and
technology, you must realize that the computer cannot monitor the actual
physiological unctions o 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 o decompression illness.

15
1.1.3. NITROX
Diving with nitrox provides the diver with an opportunity to reduce the risk o
decompression illness by reducing the nitrogen content in the breathing gas mix.
However, when the gas mix is altered, the oxygen content o the mix is generally
increased. This increase exposes the diver to an oxygen toxicity risk not usually
considered in recreational diving. In order to manage this risk, the dive computer
tracks the time and intensity o the oxygen exposure and provides the diver with
in ormation to adjust the dive plan in order to maintain oxygen exposure within
reasonably sa e limits.
In addition to the physiological e ects o enriched air on the body there are
operational considerations to be addressed when handling altered breathing mixes.
Elevated concentrations o oxygen present a ire or explosion hazard. Consult with
the manu acturer o your equipment about its compatibility with nitrox.
1.1.4. FREEDIVING
Freediving, and particularly reediving in combination with scuba diving, may
have risks that have not been researched and are not commonly known.
Any person who engages in any orm o breathhold diving is in danger o shallow-
water blackout (SWB) i.e. the sudden loss o consciousness caused by oxygen
starvation.
Any breathhold diving results in some nitrogen build-up in the blood and other ast
tissues. Due to the short time spent at depth this build-up is generally not signi icant.

16
There ore, provided the e ort involved in reediving has not been severe, there is
little risk in diving a ter breathhold diving. However, the converse is more unknown
and may increase signi icantly the risk o DCI. There ore, FREEDIVING AFTER
SCUBA DIVING IS NOT RECOMMENDED. You should avoid reediving and
not exceed ive meters [16 t] or at least two hours a ter scuba diving.
Suunto also recommends you to be trained in reediving technique and physiology
be ore conducting breathhold dives. No dive computer can replace the need or
proper dive training. Insu icient or improper training may cause a diver to commit
errors that may lead to serious injury or death.
Fig. 2.1. The push buttons of the Mosquito.

17
2. GETTING ACQUAINTED
2.1. FUNCTIONS
The MOSQUITO advanced wristop computer is a multipurpose dive instrument
and a sport watch eaturing several watch and dive computer modes. You can
select the dive computer model between the Regular Air Dive Computer (AIR),
Enriched Air Nitrox Dive Computer (EAN) and Freediving computer mode
(FREE). The AIR/EAN/FREE modes can also be disabled (set to OFF) and the
instrument can be used as a sports watch on land or in water.
2.2. PUSH BUTTONS
The Mosquito is controlled with our push buttons as ollows (see Fig. 2.1.).
M (MODE)
 To change rom a main mode to an other main mode press the mode button.
 To exit rom a submode to a main mode press the mode button.
 To activate the electroluminescent backlight hold down the mode button
or more than two seconds or one second in the diving mode.
 To accept the settings in the Setting Mode press the mode button.
S (SELECT)
 To select a submode press the select button.
 To select the active segment in the Setting Mode press the select button.
 To select the display in the Logbook Mode press the select button.

18
 To select the dive planning mode in the dive sur ace modes.
 To make a special bookmark in the pro ile memory during a dive
+, -
 To show the date, seconds or dual time in the time keeping display press
the + or - button.
 In the Setting Mode
 to increase the value press the + button
 to decrease the value press the - button.
 To operate the stopwatch see chapter 2.4.2.
 To select the dive in the Logbook Mode
 press the + button to move orward
 press the - button to move backwards.
