Mares Smart Dive Computer Instruction Manual

Instruction Manual

Smart Dive Computer

Smart Dive Computer

2

• TABLE OF CONTENTS

IMPORTANT WARNINGS 3

DISCLAIMER 3

1. INTRODUCTION 3

1.1. GLOSSARY 3

1.2. OPERATING MODES 4

1.3. USERREPLACEABLE BATTERY 4

1.4. CONNECTING SMART TO A PC OR MAC 4

1.5. BUTTON OPERATION 4

1.6. WATCH DISPLAY 5

2. MENUS, SETTINGS AND FUNCTIONS 5

2.1. CHRONO 6

2.2. PRE DIVE 6

2.3. MODE 6

2.4. SET 6

2.4.1. SET DIVE 7

2.4.1.1. LIGHT BACKLIGHT 7

2.4.1.2. P FACT P FACTOR 7

2.4.1.3. ALT ALTITUDE 7

2.4.1.4. WATR WATER 7

2.4.1.5. UNITS 8

2.4.1.6. FAST FAST ASCENT 8

2.4.1.7. ALRM ALARMS 8

2.4.1.8. ERASE ERASE DESATURATION 8

2.4.2. SET TIME 8

2.5. LOG LOGBOOK 8

2.6. PLAN DIVE PLANNER 9

2.7. PC 9

2.8. INFO 9

3. DIVING WITH SMART 9

3.1. A FEW WORDS ABOUT NITROX 9

3.2. ALARMS 10

3.2.1. ASCENT RATE 10

3.2.2. MOD/PPO2 10

3.2.3. CNS = 100% 10

3.2.4. MISSED DECOMPRESSION STOP 10

3.2.4.1. MISSED DECO STOP MODE 10

3.2.5. LOW BATTERY 11

3.3. DISPLAY INFORMATION 11

3.4. AFTER THE DIVE 12

3.5. DIVING WITH MORE THAN ONE GAS MIXTURE 12

3.5.1. SETTING MORE THAN ONE GAS 12

3.5.2. SWITCHING GAS 12

3.5.3. SPECIAL SITUATIONS 13

3.5.3.1. SWITCHING BACK TO A GAS MIXTURE WITH
LOWER OXYGEN CONCENTRATION 13

3.5.3.2. SUBMERGING BELOW THE MOD AFTER A GAS
SWITCH 13

3.6. BOTTOM TIMER MODE BT 13

3.6.1. DIVE VIOLATION INDUCED BOTTOM TIMER MODE 13

3.7. APNEA MODE 13

3.7.1. SETTINGS 13

3.7.2. USING SMART ON AN APNEA DIVE 14

3.7.2.1. SURFACING BETWEEN IMMERSIONS 14

3.7.3. LOGBOOK IN APNEA MODE 14

3.7.4. SWITCHING FROM APNEA TO SCUBA 14

4. TAKING CARE OF SMART 14

4.1. TECHNICAL INFORMATION 14

4.2. MAINTENANCE 15

4.2.1. REPLACING THE BATTERY IN SMART 15

4.3. WARRANTY 16

4.4. WARRANTY EXCLUSIONS 16

4.5. HOW TO FIND THE PRODUCT SERIAL NUMBER 16

5. DISPOSAL OF THE DEVICE 16

3

• IMPORTANT WARNINGS

No part of this document may be reproduced,
stored in a retrieval system, or transmitted
in any form without the written permission of
Mares S.p.A.

Mares adopts a policy of continuing
improvement, and therefore reserves the right
to make changes and enhancements to any of
the products described in this manual without
notice.

Under no circumstances shall Mares be held
responsible for any loss or damage sustained
by third parties deriving from the use of this
instrument.



WARNING

A dive computer is an electronic
instrument and as such it is not immune
to failure. To protect yourself against the
unlikely event of a failure, in addition to the
dive computer, also use a depth gauge, a
submersible pressure gauge, a timer or
watch, and dive tables.



WARNING

Do not dive if the display appears unusual
or unclear.



WARNING

The dive computer must not be used in
conditions that preclude its use (e.g.: low
or no visibility, making it impossible to
read the gauge).



WARNING

The dive computer cannot ensure against
possible decompression sickness.

DISCLAIMER

This manual describes how to operate an
instrument and it describes the information
provided by the instrument during a dive.
Neither this manual nor the instrument are a
substitute for dive training, common sense and
good diving practices.

How the information provided by the
instrument is interpreted and put to use by
the diver is not the responsibility of Mares.
Read the manual carefully and make sure you
understand completely how the instrument
works and the information it provides during
a dive, including information on depth, time,
decompression obligations and all warnings
and alarms. Unless you fully understand how
the instrument works and the information
it displays and unless you accept full
responsibility for using this instrument, do not
dive with it.

• 1. INTRODUCTION

1.1. GLOSSARY

AIR: Air dive

:

Symbolizes decompression stop violation.

:

Symbolizes uncontrolled ascent and uncontrolled ascent violation.

ASC:

Total ascent time, the time it takes to perform the ascent from your current depth to the surface in a decompression dive,
including all decompression stops and assuming an ascent rate of 10m/min or 33ft/min.

AVG: Average depth, calculated from the beginning of the dive.

CNS: Central Nervous System. CNS% is used to quantify toxic effects of oxygen.

DESAT: Desaturation time. The time needed for the body to eliminate the nitrogen taken up during diving.

Gas switching: The act of changing from one breathing gas to another.

Max depth: Maximum depth attained during the dive.

MOD:

Maximum Operating Depth. This is the depth at which the partial pressure of oxygen (ppO

2

) reaches the maximum allowed

level (ppO2max). Diving deeper than the MOD will expose the diver to unsafe ppO2 levels.

Multigas: Refers to a dive in which more than one breathing gas is used (air and/or Nitrox).

Nitrox: A breathing mix made of oxygen and nitrogen, with the oxygen concentration being 22% or higher.

NO FLY: Minimum amount of time the diver should wait before taking a plane.

No deco time:

This is the time that you can stay at the current depth and still make a direct ascent to the surface without having to perform
mandatory decompression stops.

O

2

: Oxygen.

O

2

%: Oxygen concentration used by the computer in all calculations.

P Factor:

Personalization factors, which allow the user to select between the standard decompression algorithm (P0) and an
increasingly more conservative one (P1, P2).

ppO

2

:

Partial pressure of oxygen. This is the pressure of the oxygen in the breathing mix. It is a function of depth and oxygen
concentration. A ppO2 higher than 1.6bar is considered dangerous.

ppO

2

max: The maximum allowed value for ppO2. Together with the oxygen concentration it defines the MOD.

Switch depth: The depth at which the diver plans to switch to a higher oxygen concentration mix while using the multigas option.

S.I.: Surface interval.

Smart Dive Computer

4

1.2. OPERATING MODES

The functions of the Smart computer
can be grouped into two categories, each
corresponding to a specific mode of operation:

• watch mode: Smart is dry on the surface. In
this mode you can use it as a normal watch.
You can also change settings, review your
logbook, use the dive planner, see remaining
desaturation after a dive, download to PC
and much more;

• dive mode: Smart monitors depth,
time, temperature and performs all
decompression calculations; dive mode
itself can be broken down into 4 sub
categories:

- pre-dive (Smart is on the surface but

actively monitoring ambient pressure, so
that it can begin to calculate a dive the
instant it is submerged below 1.2m/4ft);

- dive;

- surfacing (Smart is on the surface at

the end of a dive; dive time calculation
is halted but if the diver submerges
within three minutes the dive is resumed
including the time spent on the surface);

- post-dive (after the three minutes of

surfacing mode, Smart closes the
logbook and reverts to a display showing
desaturation time, no-fly time and surface
interval; this lasts until the desaturation
and the no-fly time both have been
reduced to zero).

1.3. USER-REPLACEABLE BATTERY

Smart uses a CR2430 user-replaceable
battery. See section 4.2.1 for instructions on
how to replace it. Good quality batteries should
suffice for approx 200-300 dives, depending on
the usage of the backlight and the temperature
of the water. Diving in cold water, usage of the
backlight and of the beeper increases battery
consumption.

The display alerts you of the status of the
battery. The three possible situations are
described as follows:

- battery symbol not visible: the remaining
battery charge is adequate for diving;

- steady battery symbol on the display: there
is enough charge for a few more dives, but
you should consider replacing the battery at
the next opportunity;

- blinking battery symbol on the display
(surface only): the battery is too weak for
diving. Smart will not function as a dive
computer and will not turn on if submerged.

The level of the battery charge can also be
found on the “INFO” page (see section 2.8).

1.4. CONNECTING SMART TO A PC
OR MAC

To connect Smart to a PC or Macintosh
computer, use the optional clip and the USB
cable and Dive Organizer to download your
dives to a PC or Divers’ Diary to download your
dives to a Mac. Both software programs can be
downloaded from www.mares.com.

1.5. BUTTON OPERATION

Smart has 2 buttons, labelled UP/ENTER
and DOWN/ESC. Each button can be pressed
and released to perform one function (up and
down) and pressed and held for one second to
perform a different function (enter and esc).
We’ll refer to them as UP and DOWN button in
the remainder of this manual.

On the surface pressing and releasing either
button allows to scroll through menus,
settings and values. Pressing and holding the
UP button enters into a menu or confirms a
setting, while pressing and holding the DOWN
button exits from a menu and goes up one
level.

During the dive, the UP button modifies the top
row (depth information) whereas the DOWN
button modifies the lower right corner of the
display. From the main watch display and in
dive mode, press and hold the DOWN button
(

) to activate the backlight.

An overview of the button function both in
surface mode and during a dive is presented
here below.

PRESS PRESS AND HOLD

WATC H

Scroll down or
decrease by 1

From time of day display:
backlight
From all others:
go back one level

DIVE

Modify bottom row Backlight

PRESS PRESS AND HOLD

WATC H

Scroll up or
increase by 1

Enter a submenu or
confirm a setting

DIVE

Modify top row

Reset stopwatch
(Multigas only:

- Activate gas switch process

- Confirm gas switch)

PRESS PRESS AND HOLD

WATC H

Scroll up or
increase by 1

Enter a submenu or
confirm a setting

DIVE

Modify top row

Reset Stopwatch
(Multigas only:

- Activate gas switch process

- Confirm gas switch)

PRESS PRESS AND HOLD

WATC H

Scroll down or
decrease by 1

From time of day display:
backlight
From all others:
go back one level

DIVE

Modify bottom row Backlight

5

SURFACE MODE

press

press and hold

DIVE MODE

press

press and hold

4s TIMEOUT

Smart Dive Computer

6

1.6. WATCH DISPLAY

The watch display is the “home” display of
Smart. In this mode, the time of day is shown
in the middle row of the display while date,
temperature, seconds, wake-up time and
second time can be displayed at the bottom
by pressing the DOWN button. Note that the
temperature reading will be affected by your
body heat while you are wearing the watch. A
growing or diminishing ring of 60 dots around
the perimeter of the display represents the
seconds.

When the wake-up time is displayed, pressing
and holding the UP button turns the wake-up
alarm on or off.

When the second time is displayed, pressing
and holding the UP button switches main time
and second time.

• 2. MENUS, SETTINGS AND
FUNCTIONS

This chapter describes in detail all menus,
setting and functions of the Smart dive
computer.

From the time of day display, pressing the
UP button allows you to scroll through the
following sequence of menus (note that once
inside the menu loop, pressing the DOWN
button scrolls through the menus in reverse
sequence):

- CHROnO: allows you to operate Smart like a
normal stopwatch;

- PrE dIVE: places Smart in the ready-to-dive
mode;

- MOdE: allows you to set the computer to air,
nitrox or bottom timer mode;

- SEt: allows you to view and change all
settings relative to the dive computer;

- LOG: allows you to access the detailed
history of the dives performed;

- PLAN: allows you to plan dives as a function
of depth based on your current nitrogen load;

- PC: allows you to download dives to a PC or
Mac

- INFO: allows you to view information about
software and hardware of your Smart.

The pre-dive mode puts the computer in a
ready-to-dive mode and ensures that Smart
starts to monitor the dive as soon as a depth
of 1.2m/4ft is reached. If you start the dive
without putting Smart into pre-dive mode,

it will start to monitor the dive automatically
but with a delay of up to 20 seconds from
immersion.

The pre-dive display shows p factor and
altitude settings, time of day and surface
interval since the last dive. If Nitrox is set,
it will show the O

2

percentage and the

corresponding MOD.

NOTE

- If you remain in pre-dive for longer than
3 minutes without pressing any button,
Smart will revert to normal watch
operation.

- It is recommended to put Smart into pre­dive before submerging. Not doing so
can lead to a delay of up to 20s in Smart
monitoring the dive.

2.1. CHROnO

Press and hold the UP button to enter
this menu. The middle row now features a
stopwatch while the time of day has moved
to the bottom row. Press the UP button to
start and stop the time, then press the DOWN
button to reset the time to zero. Press and hold
the DOWN button to exit from the stopwatch
function (this stops and resets the stopwatch if
it was running or stopped at a non-zero value
upon exiting).

The stopwatch features also a split-time
function: by pressing the DOWN button while
the stopwatch is running, the time itself will
freeze while SPL blinks in the top row and the
stopwatch continues in the background. Every
time you press the DOWN button the split time
will refresh with the new value. Press and hold
the DOWN button to exit the split-time mode.
Note that while in split-time mode, the UP
button has no function.

2.2. PrE dIVE

Press and hold the UP button to enter this
menu and put Smart into the ready-to-dive
mode.

2.3. MOdE

Here you can define the type of gas you will
be breathing during the dive (air or enriched
air nitrox, including multigas). You can also
set Smart to bottom timer (BT), in which
case Smart will show only time, depth
and temperature: it will not carry out any
decompression calculation and it will not
show any warnings and alarms. You can set
Smart also to APNEA, which in essence is a
bottom timer with special features dedicated
to apneists.
Press the UP or DOWN button to scroll through
the four possible options (AIR, EAN, BT or
APNEA), then press and hold the UP button to
select it.

7

AIR is the equivalent of setting EAN to 21%
and a ppO

2

max of 1.4bar, but simplifies the
display a bit by not showing the CNS (its value
however is calculated in the background and if
needed the 75% warning and the 100% alarm
are triggered).
When selecting EAN, you are taken to
a submenu in which you can define the
percentage of oxygen in the mixture (%O2) and
the maximum value of oxygen partial pressure
(ppO2max) for up to three breathing mixes. The
maximum possible value for the ppO2max is

1.6bar. Most training agencies recommend not
to exceed a value of 1.4bar.

Once inside this menu, press the UP or DOWN
button to change the O2% and observe how this
affects the maximum operating depth (MOD).
Then press and hold the UP button to move
on to the ppO2max and use the UP or DOWN
button to change the value, again noticing how
this affects the MOD. Press and hold the UP
button again to save the setting.

This leads you to the G2 OFF screen. Press and
hold the DOWN button to exit the menu or go
to section 3.5 to read about diving with more
than one gas.



WARNING

- Diving with Nitrox may only be
attempted by experienced divers after
proper training from an internationally
recognized agency.

- Before every dive and after changing
the tank, you must make sure that
the set oxygen concentration in Smart
corresponds to the oxygen concentration
in the tank. Setting the wrong oxygen
concentration can lead to serious injury
or death.

2.4. SEt

Smart’s SEt menu allows you to change
settings. Once inside this menu, press the
UP or DOWN button to scroll between two
submenus: SEt dIVE, where you can set
parameters pertaining to the dive, and SEt
tIME, where you can set parameters pertaining
to time and date.
Press and hold the UP button to enter a menu,
press the UP or DOWN button to scroll up and
down between available options or to increase
or decrease the value of a setting. Then press
and hold the UP button to confirm the change
in setting. Press and hold the DOWN button to
go up one level in the menu tree.

MENU Description

SEt dIVE

- LIGHt

Allows you to set the duration
after which the backlight
turns off automatically. You
can set this between 1 and 10
seconds.

- P FACt

Allows you to choose between
the standard algorithm (P0)
and an increasingly more
conservative one (P1, P2).

- ALt

Allows you to set the algorithm
into altitude mode when diving
in mountain lakes.

- WAtR

Allows you to choose between
salt (1.025kg/l) and fresh
(1.000kg/l) water or EN13319
(1.0197kg/l), corresponding
to the water density used in
European Norm 13319.

- UNItS

Allows you to choose between
metric (m, °C) and imperial
(ft, °F) units.

- FASt

Allows you to turn off the dive
violation due to uncontrolled
ascent. This is for dive
instructors only, who may
find themselves in such a
situation because of their
teaching requirements.

- DEEp

Allows you to activate or
deactivate the visualization of
deep stops.

- tEMp

Allows you to define whether
the temperature is displayed
in the top right or bottom
right corner of the display.

- ALRM

Allows you to turn on or off all
audible alarms of Smart.

- ErASE

Allows you to reset the
nitrogen saturation to zero,
thereby erasing the effects of
a previous dive. This is only for
people who plan to lend their
computer to another diver
who has not performed a dive
within the last 24hours.

SEt tIME

Allows you to set the time
format, time and date, wake­up alarm and second time.

Smart Dive Computer

8

2.4.1. SEt dIVE

2.4.1.1. LIGHt (BACKLIGHT)

Smart has a backlight which can be activated
in case of low ambient light. The backlight is
activated by pressing and holding the DOWN
button. During a dive, the backlight will stay on
for the duration defined in this menu. You can
choose between 1 and 10 seconds.

NOTE

- The backlight consumes battery energy:

the longer the backlight stays on, the
less your battery will last.

- If the low battery warning is activated,

the backlight will be disabled.

In surface mode, the backlight can be activated
by pressing and holding the DOWN button. The
backlight will stay on for 6 seconds, unless you
go into any menu, in which case it will stay on
until you return to the pre-dive display or after
one minute of no button operation.

2.4.1.2. P FACt (P FACTOR)

Smart allows you to set an additional personal
safety factor for those circumstances in which
you want to be especially cautious, such
as after a long period of inactivity or when
planning a strenuous dive. In this menu you
can choose between the standard algorithm
(P0), a more conservative version (P2) or
an intermediate one (P1). On the pre-dive,
post-dive, logbook and planner displays, P1
is displayed with p+, P2 with p++ and P0 is
indicated by the absence of symbols.

NOTE

The choice of p factor will be reflected in
the dive planner.

2.4.1.3. ALt (ALTITUDE)

Atmospheric pressure is a function of altitude
and of weather conditions. This is an important
aspect to consider for diving, because the
atmospheric pressure surrounding you has an
influence on uptake and subsequent release
of nitrogen. Above a certain altitude, the
decompression algorithm has to change in
order to account for the effect of the change
in atmospheric pressure. When diving in a
mountain lake, find out what the altitude is and
choose the altitude range in Smart within the
four available options:

- A0: from sea level to approximately
700m/2300ft;

- A1: from approximately 700m/2300ft to
approximately 1500m/4900ft ;

- A2: from approximately 1500m/4900ft to
approximately 2400m/7900ft;

- A3: from approximately 2400m/7900ft to
approximately 3700m/12100ft;

- We do not recommend diving at altitudes
above 3700m / 12100ft. If you do, set Smart
to bottom timer and find appropriate
altitude dive tables.

On the pre-dive, post-dive, logbook and
planner displays, A1 through A3 are indicated
with the mountain symbol filled with 1, 2 or 3
segments while A0 is indicated by the absence
of symbols.



WARNING

Diving in mountain lakes without first
setting Smart to the proper altitude setting
can cause severe injury or death.

2.4.1.4. WAtR (WATER)

You can set the computer for FRESH water,
SALt water or EN13319 calibration, depending

on where you intend to dive. Setting the
wrong water type entails an error in depth
measurement of 1-3% (e.g. at a depth of
30m/100ft, a computer set to salt water
will show 29m/97ft in fresh water whereas
a computer set to fresh water will show
31m/103ft in salt water). Note that this
does not affect the proper functioning of the
computer, since the computer performs all
of the calculations based purely on pressure
measurements.

2.4.1.5. UNItS

You can choose between metric (depth in
meters, temperature in °C) and imperial units.
(depth in feet, temperature in °F).

2.4.1.6. FASt (FAST ASCENT)

A fast (uncontrolled) ascent is defined as one in
which a speed of 12 m/min / 40ft/min or higher
was maintained over more than two thirds of
the way up. This applies to dives deeper than
12m/40ft only. In such an event, due to the
potential of harmful bubble formation, Smart
locks the computer for 24hours in order to
discourage you from diving again. In this menu,
you have the option to disable the locking up of
the computer in the event of an uncontrolled
ascent.



WARNING

- An uncontrolled ascent increases your
risk of decompression sickness (DCS)

- This feature is intended for very
experienced divers only, such as dive
instructors, who take full responsibility
for the consequences of turning off this
function.

2.4.1.7. ALRM (ALARMS)

In this menu you can disable audible alarms.



WARNING

Disabling audible alarms can lead you into
potentially dangerous situation and could
result in serious injury or death.

9

2.4.1.8. ErASE (ERASE DESATURATION)

Smart allows you to reset the desaturation
in the computer. Any tissue saturation
information from a recent dive will be reset to
zero and the computer treats the next dive as
a non-repetitive dive. This is useful when the
computer is loaned to another diver who has
not dived in the last 24hours.



WARNING

Diving after having reset the desaturation
is extremely dangerous and is very likely to
cause serious injury or death. Do not reset
the desaturation unless you have a valid
reason to do so.

In order to prevent accidental desaturation
reset, you must enter the security code once
you decide to proceed with the reset. The
security code is 1234.

After entering the security code you will get a
confirmation of the successful completion of
the operation.

2.4.2. SEt tIME

This menu allows you to set the time format,
time, date, wake-up alarm and second time

(

). Scroll through the options by pressing
either button. Press and hold the UP button to
edit an option, then press either button to
modify the blinking value, then press and hold
the UP button to confirm the new setting.

Smart features a “sleep” mode: in case you
don’t wear it other than on a dive trip, you can
put Smart in sleep mode to reduce battery
consumption. To wake up from sleep mode,
press either button.

LCD refresh rate

This allows you to switch between a low and
a high refresh rate of the display. The default
setting is low: this consumes less energy but
under very intense light you might see a slight
flicker in the display. Setting it to high reduces
the flicker but will shorten the battery life by
about 30%.

2.5. LOG (LOGBOOK)

Smart can record the profiles of approximately
35hours of diving, at a sampling rate of 5
seconds. The information can be transferred
using the optional USB clip to PC via the Dive
Organizer software or to a Mac via the Divers’
Diary software. In addition, Smart can show
most of the information directly on the display.

When you first enter the logbook menu, you
will see a summary of all dives performed to
date. In particular, the maximum depth ever
reached, the total number of dives, the total
number of hours spent underwater and the
coldest water temperature recorded.

From here, press the UP or DOWN button to
scroll through all dives in the memory of the
computer. Each dive has two or more pages
of data. Page 1 has maximum depth of the
dive in the upper left corner while minimum
temperature and average depth alternate
every 2s in the upper right corner. In the center
row time in and time out alternate on the left
side of the screen followed by a sequential dive

counter (1 being the most recent dive). In the
bottom left corner is the date of the dive and
next to it the oxygen concentration of G1.

Press and hold the UP button to view the next
page of the dive log, which shows the surface
interval prior to the dive alternating with the
dive time and CNS (alternating between start
and end value) in the bottom row. In case more
than one gas was used in the dive, information
about G2 and G3 if applicable is shown
alternating with G1 on the first page.

Press the UP or DOWN button to scroll
between the pages of information, press and
hold the DOWN button to return to the list of
the main logbook menu.

2.6. PLAN (DIVE PLANNER)

This function allows you to plan your next dive.
Upon entering this menu, the display lists the
settings used for the calculation: P Factor and
Altitude selections. The bottom row shows
a surface interval of 0:00: in case you dived
recently, you can enter an additional surface
interval between now and when you intend to
dive by pressing the UP button: the residual
nitrogen load will be adapted accordingly. Next
press and hold the DOWN button to enter the
actual dive plan: Smart displays a depth and
the corresponding no deco time. In the bottom
row it lists the oxygen concentration of G1.

Use the UP and DOWN buttons to increase/
decrease the depth in 3m / 10ft increments

Smart Dive Computer

10

(limited to the MOD of G1) and view the related
no deco time. Press and hold the UP button
to enter deco planning: Smart will add one
minute to the no deco time and show the
corresponding deco obligation. Now use the
UP and DOWN buttons to modify the dive time
and view how this affects the deco calculation.
Press and hold the DOWN button to return to
the no deco dive planner. From here either
choose a different depth and repeat a deco
plan or press and hold the DOWN button to exit
the dive planner.

NOTE

The dive planner is enabled only if either
air or nitrox mode is set

2.7. PC

This submenu allows you to download
your dive data to a PC or Mac. Press the

ENTER button and the display will show PC
ready, symbolizing that Smart is ready to

communicate.

2.8. INFO

This submenu provides information about
the hardware and software of your Smart and
about the status of the battery: OK means the
battery is good, LO means the battery is weak
but you can still do a few more dives, and KO

means the battery is very low and Smart won’t
function as a dive computer.

• 3. DIVING WITH SMART

3.1. A FEW WORDS ABOUT NITROX

Nitrox is the term used to describe breathing
gases made of oxygen-nitrogen mixes with
an oxygen percentage higher than 21% (air).
Because Nitrox contains less nitrogen than
air, there is less nitrogen loading on the
diver’s body at the same depth as compared to
breathing air.

However, the increase in oxygen concentration
in Nitrox implies an increase in oxygen partial
pressure in the breathing mix at the same
depth. At higher than atmospheric partial
pressures, oxygen can have toxic effects on the
human body. These can be lumped into two
categories:

- Sudden effects due to oxygen partial
pressure over 1.4bar. These are not related
to the length of the exposure to high partial
pressure oxygen, and can vary in terms of the
exact level of partial pressure they happen
at. It is commonly accepted that partial
pressures up to 1.4bar are tolerable, and
several training agencies advocate maximum
oxygen partial pressures up to 1.6bar.

- Long exposure effects to oxygen partial
pressures over 0.5bar due to repeated and/
or long dives. These can affect the central
nervous system, cause damage to lungs or
to other vital organs.

Smart keeps you safe with respect to these two
effects in the following ways (as long as it is
set to either air or nitrox):

• Against sudden effects: Smart has an MOD
alarm set for a user-defined ppO

2

max. As
you enter the oxygen concentration for the
dive, Smart shows you the corresponding
MOD for the defined ppO2max. The default
value of ppO2max from the factory is 1.4bar.
This can be adjusted to your preference
between 1.2 and 1.6bar. Please refer to
section 2.1 for more information on how to
change this setting. If Smart is set to air, the
ppO2max is set to 1.4bar by default.

• Against long exposure effects: Smart
“tracks” the exposure by means of the
CNS% (Central Nervous System). At levels
of 100% and higher there is risk of long
exposure effects, and consequently Smart
will activate an alarm when this level of
CNS% is reached. Smart also warns you
when the CNS level reaches 75%. Note that
the CNS% is independent of the value of
ppO2max set by the user.

3.2. ALARMS

Smart can alert you of potentially dangerous
situations. There are five different alarms:

- Ascent rate alarm;

- Exceeding a safe ppO

2

/MOD;

- CNS =100%;

- Missed decompression stop;

- Low battery during the dive



WARNING

When in bottom timer mode, all warnings
and all alarms are OFF aside for the low
battery alarm.

NOTE

- Alarms are both visual and audible, as
described in detail below.

- Ascent rate alarm has priority over
other alarms if they are triggered
simultaneously.

3.2.1. ASCENT RATE

As soon as depth decreases by more than
80cm / 3ft Smart activates the ascent rate
control algorithm and displays the calculated
value. This is shown in lieu of the dive time.



WARNING

A rapid ascent increases the risk of
decompression sickness.

If Smart determines an ascent rate of 10m/min
/ 30ft/min or higher, the fast ascent alarm is
triggered: an audible alarm goes off and SLOW
appears blinking on the display. This persists
until the ascent rate is reduced to 10m/min /
30ft/min or less.

If the ascent rate exceeds 12m/min / 40ft/min
at a depth below 12m / 40ft,

blinks as well.
If a speed in excess of 12m/min / 40ft/min is
maintained for two thirds or more of the depth
at which the alarm was first triggered, Smart
considers it a dive violation and the display will

show the steady

.

11

In this case, if the diver attempts a repetitive
dive after surfacing, Smart will only function as
a depth gauge and timer (bottom timer mode),

and will display

on the screen throughout

the dive.

3.2.2. MOD/ppO

2



WARNING

- The MOD should not be exceeded.
Disregarding the alarm can lead to
serious injury or death.

- Exceeding a ppO

2

of 1.6bar can lead to
sudden convulsions resulting in serious
injury or death.

When the diver reaches a depth at which the
ppO2 of the inspired gas exceeds the maximum
limit entered in the corresponding setting
(from 1.2 to 1.6bar), an audible alarm goes off,
the current depth starts to blink and the value
of the MOD is shown to the right of the current
depth, also blinking.

The alarm persists until the diver has
ascended enough for the ppO

2

to return within

the set limit.



WARNING

When the MOD alarm is triggered, ascend
immediately until the alarm stops. Failure to
do so could result in serious injury or death.

3.2.3. CNS = 100%



WARNING

When the CNS reaches 100% there is
danger of oxygen toxicity. Start procedure
to terminate the dive.

Oxygen toxicity exposure is tracked on
Smart by means of the CNS% based on
currently accepted recommendations for
exposure limits. This toxicity is expressed as
a percentage value which ranges from 0%
to 100%. When the value reaches 75%, an
alarm goes off and the CNS value blinks on
the screen. Additionally the CNS becomes
the default item in the lower right corner: if
you call up other information after 8 seconds
the CNS appears again. Ascend to shallower
depth to decrease oxygen loading and consider
terminating the dive.

When the oxygen toxicity level approaches
100% the alarm is repeated for 5 seconds in
one-minute intervals after the first occurrence
and for as long as the value of CNS stays at
or above 100%. Consider terminating the dive
immediately!



WARNING

Diving with oxygen toxicity at levels of 75%
or greater may put you into a potentially
hazardous situation, which could result in
serious injury or death.

3.2.4. MISSED DECOMPRESSION STOP



WARNING

Violating a mandatory decompression
obligation may result in serious injury or
death.

If you ascend above the decompression stop
depth by more than 0.3m (1ft), a downward
pointing triangle appears, an audible alarm
goes off and both the current depth and the
depth of the deco stop start blinking. This
alarm remains active until you return to the
correct depth.



WARNING

- When the missed deco stop alarm is
triggered, desaturation of the simulated
tissue compartments is halted and
resumes only when the diver returns to
the correct stop depth.

- Never ascend above the displayed
decompression stop depth.

3.2.4.1. MISSED DECO STOP MODE

If the stop depth is exceeded by more than 1m
(3ft) for more than three minutes, Smart
considers it a dive violation and the display will

show

.

In this case, if the diver attempts a repetitive
dive after surfacing, Smart will function only as
a depth gauge and timer (bottom timer mode),

and it will display

on the screen.

3.2.5. LOW BATTERY

If Smart detects that the battery power level is
safe for diving but without much reserve left,
it will show the steady battery symbol on the
display.

3.3. DISPLAY INFORMATION

Upon immersion, if Smart was set to pre­dive, it will immediately start monitoring the
dive. Otherwise, it will turn on automatically
within 20 seconds of having reached a depth of

1.2m/4ft.

The following information is shown:

- current depth

- max depth

- no deco time (or depth and duration of
deepest stop and total ascent time in case of
decompression dives)

- dive time

- temperature

- nitrogen saturation bar graph

By pressing the UP button, you can modify
the information displayed in the upper row. At
each button press, the screen cycles through,
max depth, average depth, MOD (nitrox only),
deep stop (if activated and if calculated to be
present), and an empty field.

By pressing the DOWN button, you can modify
the information displayed in the bottom row. At
each button press, the screen cycles through
temperature, oxygen percentage, CNS, ppO

2

,

Smart Dive Computer

12

time of day (in lieu of the dive time; the time
of the day has a 4-second time out after which
the dive time is displayed again) and an empty
field, in which case the dive time is shown
inclusive of seconds.

NOTE

The position on the display of the
temperature can be customized in the SEt
DIVE menu.

In case of an ascent, the speed in m/min or ft/
min is displayed in lieu of the dive time.

The depth is given in 10cm resolution until

99.9 meters, after which it is given in 1m
resolution. When the depth is displayed in
feet, the resolution is always 1 foot. At a depth
shallower than 1.2m/4ft, the display shows ---.
Maximum possible depth is 150m/492ft.

The dive time is displayed in minutes. If during
the dive you ascend to the surface, the time
spent on the surface will only be counted
if you descend again below 1.2m/4ft within
3 minutes. This allows for brief periods of
orientation. While on the surface, the time will
not show as progressing but it is running in
the background. As soon as you submerge, the
time will resume, including the time spent on
the surface.

The no deco time is calculated in real time and
updated continuously. Maximum displayed no
deco time is 99 minutes. If you remain at depth
beyond a no deco time of zero minutes, you will
enter into decompression: you can no longer
make a direct ascent to the surface and Smart
displays a MANDATORY decompression stop.
Instead of a no deco time, it shows you the
depth and duration of the deepest stop and the
total ascent time (ASC), which includes each
decompression stop and the time required to
travel the vertical distance to the surface at
a rate of 10m/min / 33ft/min. ASC does not
include the duration of deep stops.

DEEP, DECO and SAFETY stops:

- DEEP stops are generated as you approach
the no deco limit. You can either have one
2-minute stop or two 1-minute stops. DEEP
stops are NOT mandatory. Deep stops are
displayed to the right of the current depth.

Upon reaching the optimum range for

carrying out a deep stop (+/- 1m /3ft of the
displayed depth), the deep stop itself will
be shown in the top right corner with the
label DEEP blinking, and a countdown timer
appears to indicate the progress of the stop.
Deep stops can be deactivated in a dedicated
settings menu.

- DECO stops are generated progressively
as you stay down beyond the no deco time.
DECO stops are MANDATORY. For DECO
stops, since the duration is a function of the
exact depth, only the minutes are shown.
During a decompression stop, the following
symbols may appear:

: optimal range for the decompression

stop;

: above decompression stop depth,

descend immediately!

- A SAFETY stop is generated as soon as the
depth of the dive exceeds 10m / 33ft. It has
a duration of 3 minutes and it is carried
out between depths of 6m / 20ft and 3m /
10ft at the end of a dive prior to surfacing.
Such stop is NOT mandatory but HIGHLY
RECOMMENDED.



WARNING

During all dives, perform a safety stop
between 3 and 6 meters/10 and 20 feet for
3 minutes, even if no decompression stop
is required.

The nitrogen bar graph is on the right side of
the display. It represents nitrogen saturation in
the leading tissue compartment. The bar graph
is made of five segments, which gradually fill
during the dive. The more black segments
you see, the closer to the no deco limits you
are. As you enter a situation of mandatory
decompression stop, all segments will be black.

During a surface interval, the segments
will gradually turn off as Smart tracks the
offgassing of your tissues.

Ascent rate: in presence of a depth change
in excess of 80cm / 3ft, Smart calculates the
corresponding ascent speed and displays in
place of the dive time, for the duration of the
ascent.

3.4. AFTER THE DIVE

Upon returning to the surface, Smart first
goes into the so-called surfacing mode. This
mode allows you to resume your dive after a
brief period of orientation. The screen shows a
3-minute countdown.

If you submerge again before the 3-minute
countdown is over, the dive time will resume
from where it left off, including the time spent
on the surface. If you do not submerge before
the end of the countdown, Smart considers the
dive finished, records the data to the logbook
and reverts to the so-called post-dive mode.

The post-dive screen shows two sets of
information, alternating in 4s intervals. One
contains:

- The remaining desaturation time (DESAT):
this is calculated by the decompression
model in the computer. Any dive started
while there is remaining desaturation on
your computer is considered a repetitive
dive, meaning that Smart accounts for the
pre-existing nitrogen load in your body.

- The no-fly time (NO FLY): this is the time
during which an exposure to the reduced
pressure inside the cabin of an airplane
could cause decompression sickness. Smart
employs, as recommended by NOAA, DAN
and other agencies, a standard 12-hour
(no-deco non-repetitive dives) or 24-hour
(deco and/or repetitive dives) countdown.
Hence you may find a situation in which
the desaturation time is shorter than the
no-fly time. This is simply the consequence
of the desaturation time being calculated
by the algorithm based on the actual dive
profile, while the no-fly time is an accepted
standard in the diving industry. Since the
real effect of flying after diving has never
been fully investigated, this approach fits
with our philosophy.



WARNING

Flying while Smart displays NO FLY can
result in serious injury or death.

- The surface interval (S.I.): this is displayed
from the moment the dive is closed (3
minutes after surfacing) for as long as there
is remaining desaturation or no-fly time on
the computer.

- In case of a dive violation, the corresponding
symbol (

, ) is shown.

13

The other contains a condensed log of the last
dive: maximum and average depth in the top
row, dive time and set O

2

% in the bottom row.
In addition, the bar graph shows the calculated
nitrogen load in the leading tissue. You can use
this to gauge your progress in getting rid of
nitrogen as the surface interval grows. Smart
continues to perform decompression-related
calculations (nitrogen release), for as long as
there is desaturation time left.

3.5. DIVING WITH MORE THAN ONE
GAS MIXTURE



WARNING

- Diving with more than one gas mixture
represents a much higher risk than
diving with a single gas mixture, and
mistakes by the diver may lead to
serious injury or death.

- During dives with more than one gas
mixture, always make sure you are
breathing from the tank that you intend
to breathe from. Breathing from a high
oxygen concentration mix at the wrong
depth can kill you instantly.

- Mark all your regulators and tanks so
that you cannot confuse them under any
circumstance.

- Before each dive and after changing
a tank, ensure that each gas mixture
is set to the correct value for the
corresponding tank.

Smart enables you to use up to three gas
mixtures during the dive (air and Nitrox
only). The three mixtures are labeled G1, G2
and G3 and must be in ascending order of
oxygen content, i.e. G1 has the lowest oxygen
concentration, G2 an intermediate value, and
G3 has the highest oxygen concentration of the
three. If you are diving with only two mixtures,
you will be utilizing tanks G1 and G2.



WARNING

It is not possible to switch to a gas at a
depth at which the oxygen partial pressure
for that gas is greater than the set
maximum value.

NOTE

- If you dive using just one gas, select G1
and deselect the other two.

- For dives with two gases, select G1 and
G2 and deselect the third.

- When enabling G2 and G3, you must first
define G2 and then G3.

- You cannot activate G3 without first
having activated G2.

- G2 cannot have an oxygen percentage
higher than G3.

- If you set G2 to OFF, G3 will
automatically be set to OFF also.

- The MOD for G2 and G3 is the switch
depth for the corresponding gas. This
is what Smart uses for its calculation,
alarms and suggested switch points.

3.5.1. SETTING MORE THAN ONE GAS

The characteristics of the gases must be
entered in the computer before the dive. It will
then be your responsibility to tell Smart which
gas is currently being used during the various
phases of the dive.

To use multiple gases, you will need to enable
the gases and set the oxygen percentage and
the ppO

2

max for each one. This is done in the
same way as for G1, with the difference that
for G2 and G3 you can turn a gas ON or OFF.
Keep in mind that the MOD for G2 and G3 is
the depth at which Smart will prompt you
to perform the gas switch (see section 3.5.2
below). To enable G2 press the UP button from
the G2 OFF display. You will now see G2 ON, a
value of oxygen concentration, ppO2 and MOD.
Proceed as you would for G1 until you get
to the G3 OFF screen. Either press and hold
the DOWN button if you have finished setting
gases, or press the UP button to advance to the

G3 ON display and setting of G3.

3.5.2. SWITCHING GAS

Smart always begins the dive with G1, which
has the lowest percentage of oxygen. When
during the ascent you reach the depth
corresponding to the MOD of G2, Smart sounds
an audible signal and the oxygen concentration
of G1 starts to blink in the lower right corner.

Press the UP button while this indication is
blinking to initiate the gas switch: the oxygen
percentage of G2 starts to blink in lieu of that
of G1, and in the top right corner the MOD of
G2 is displayed, also blinking.

Press and hold the UP button to confirm the
switch to G2: the set oxygen concentration
will be displayed steadily in the lower right
corner of the screen, and within 20 seconds
the ascent time is updated to reflect the higher
oxygen concentration in the breathing gas.

If you press the UP button while G2 is blinking,
the next available gas in the list will be
displayed instead. This will be G1 if only two
gases are set or if you are deeper than the
MOD of G3, or G3 if you have set three gases
and are shallower than the MOD of G3.

NOTE

- Smart will allow the change only if
the depth is shallower than the MOD
corresponding to the set ppO

2

max.

- Smart will not allow the gas switch if you
are deeper.

- The automatic blinking of the oxygen
concentration of G1 lasts only for 20
seconds. You can however initiate the
gas switch at any time by pressing and
holding the UP button when the oxygen
concentration is displayed in the lower
right corner, then switch to G2 as long
as your depth allows the gas to be
activated.

- The same process is repeated when
you approach the MOD for G3 with G2
blinking instead of G1

- If you have set G1, G2 and G3 and have not
switched from G1 to G2, once you reach
the MOD for G3 the oxygen concentration
of G1 will again blink to alert you of the
possibility of switching gas.

Smart Dive Computer

14

3.5.3. SPECIAL SITUATIONS

3.5.3.1. SWITCHING BACK TO A GAS MIXTURE
WITH LOWER OXYGEN CONCENTRATION

There may be situations in which you have
to switch back to a gas with lower oxygen
concentration than what you are currently
breathing. This can happen for instance if you
want to descend deeper than the MOD for the
current gas, or if for instance you have run out
of gas in G2 during the decompression. To do
so, simply press the DOWN button until the
oxygen concentration is displayed in the lower
right corner, then press and hold the UP button
to initiate the gas switch. From here on the
procedure is the same as described in 3.5.2.

3.5.3.2. SUBMERGING BELOW THE MOD AFTER
A GAS SWITCH

If after having switched to a gas mixture with a
higher oxygen concentration you inadvertently
drop again below the MOD for that mixture,
the MOD alarm will immediately go off. Either
switch back to a gas mixture suited for that
depth, or ascend above the MOD for the gas
mixture you are breathing from.

3.6. BOTTOM TIMER MODE (BT)

When Smart is set to BT mode, it will only
monitor depth, time and temperature, and will
not carry out any decompression calculation.
Maximum displayed dive time in gauge mode
is 999 minutes. You can only switch to bottom
timer mode if the computer is completely
desaturated. All audible and visual alarms,
other than the low battery alarm, are turned off.



WARNING

Dives in bottom timer mode are performed
at your own risk. After a dive in bottom
timer mode you must wait at least 24hours
before diving using a decompression
computer.

During a dive in bottom timer mode, the
following information is displayed:

- current depth

- max depth

- stopwatch

- dive time

- temperature

- in case of an ascent: ascent speed
(in m/min or ft/min).

Press the UP button to toggle between max
depth, average depth, and an empty field.
Press the DOWN button to bring up the time of
day in lieu of the dive time (the display reverts
back to dive time after 4 seconds) or to show
the dive time inclusive of seconds.
From any other display, pressing and holding
the UP restarts the stopwatch. If also the
average depth is displayed, pressing and
holding the UP button resets also the average
depth.

3.6.1. DIVE VIOLATION INDUCED BOTTOM
TIMER MODE

The following violations can occur during an
Air or Nitrox dive:

- Uncontrolled ascent.

- Missed deco stop.
In case of a violation, Smart will restrict the
use of Air and Nitrox mode for 24hours, and
will only allow operation in bottom timer mode.

3.7. APNEA MODE

Smart features an apnea mode with dedicated
features specifically for breath hold divers. In
apnea, we differentiate between immersion
and dive session. An immersion is the
individual trip below the water surface.
The dive session is a group of immersions
performed in sequence without exiting the
apnea mode.



WARNING

The practice of apnea exposes divers to
different hazards from those associated
with scuba diving. The diver should be
aware of these hazards and understand
how to avoid them.



WARNING

Do not practice apnea within 24 hours of
having performed a scuba dive.

3.7.1. SETTINGS
Go into the MODE menu and from here select

APNEA then press and hold the UP button to

confirm your choice. This will automatically
lead you into the settings menu for apnea
diving. Press and hold the DOWN button to exit
if you don’t need to change any of the settings.
Else scroll through the available settings
pressing either button. To edit a setting,
press and hold the UP button, then press
either button to modify the setting, then press
and hold the UP button again to confirm the
change. The available settings are:

AL.beep

This allows you activate or deactivate all
warnings at once.

Dive time

If active, when the dive time reaches the set

limit an audible alarm will go off and the dive
time will blink on the display.

Surf int

If active, when the surface interval reaches the
set limit an audible alarm will go off and the
surface interval will blink on the display.

Max

If active, upon reaching the depth defined in
the setting an audible alarm will go off and the
depth will blink on the display.

Int

This allows you to set a depth interval at which
a short audible sequence is activated. For
instance, if you set a depth interval of 5m/15ft,
the audible sequence will go off at 5m/15ft,
10m/30ft, 15m/45ft etc.

3.7.2. USING SMART ON AN APNEA DIVE

Put Smart into PRE DIVE so that as soon
as you submerge past 1.2m/4ft it will start
monitoring your dive. Smart will show the
current depth in the top row, the dive time in
minutes and seconds in the middle row and
the water temperature in the bottom row.
Press the DOWN button and the time of day
will appear for a few seconds to the left of the
temperature. Press and hold the DOWN button
to activate the backlight.

15

3.7.2.1. SURFACING BETWEEN IMMERSIONS

When returning to a depth of less than

0.8m/3ft, Smart switches to surface mode.

The display will show the maximum depth
of the dive that just ended in the top row, its
duration in the middle row, and the surface
time in minutes and seconds in the bottom
row together with the minimum temperature
recorded during the immersion. The number
to the right of the max depth is the sequential
counter of the immersions in the dive
sequence.

By pressing the UP button the display switches
to maximum depth of the dive session in the
top row, maximum dive time of the session
in the middle row and minimum temperature
during the session in the bottom row.

Press and hold the UP button to exit apnea
mode. Do this only at the end of your dive
session so that your immersions are all logged
together (see section 3.7.3 for information
about the logbook in apnea mode). Note that
Smart will exit the apnea mode automatically
after 30 minutes without immersion.

3.7.3. LOGBOOK IN APNEA MODE

Smart separates scuba dive logs from apnea
logs, hence there is a dedicated summary page
for each. As you enter the logbook function,
the two alternate every 4 seconds. The apnea
summary shows max depth in the top row,
longest dive time in the middle row, number
of sessions and minimum temperature in the
bottom row.

Upon pressing the UP button, individual logs
will be shown in chronological sequence.
Scuba dives are described in section 2.5.
Apnea dives are grouped in sessions, and for
each session there are two summary pages:
the first shows the maximum depth of the
session, the time the session started and the
date, in addition to a sequential counter;

Press and hold the UP button to reach
the second summary page, which shows
the maximum depth and the number of
immersions of the session in the top row, the
time the session started and the sequential
counter in the middle row, the longest dive
time and the minimum temperature of the
session in the bottom row.

Press and hold the UP button to enter the
session and see max depth and sequential
counter of the immersion at the top, dive
time in the middle, surface interval prior to
immersion and minimum temperature of the
immersion at the bottom.

Press either button to view the details of other
immersions within the same session or press
and hold the DOWN button to exit the session
log.

3.7.4. SWITCHING FROM APNEA TO SCUBA

It is commonly accepted that scuba diving after
apnea diving is safe, but we take a slightly
more conservative approach. Smart evaluates
your apnea activity and imposes a restriction
before you can switch the dive computer from
apnea to scuba based on your max depth in
apnea in the preceding 24 hours:

- up to 5m/15ft: no restriction

- up to 10m/33ft: 2-hour restriction since the
last apnea dive

- up to 20m/66ft: 4-hour restriction since the
last apnea dive

- up to 30m/100ft: 6-hour restriction since the
last apnea dive

- over 30m/100ft: 8-hour restriction

• 4. TAKING CARE OF SMART

4.1. TECHNICAL INFORMATION

Operating altitude:

- with decompression – sea level to

approximately 3700m/12100ft

- without decompression (gauge mode) – at
any altitude

Decompression model: RGBM Mares-Wienke
(10 tissues)

Depth measurement:

- Max displayed depth: 150m/492ft

- Resolution: 0.1m until 99.9m and 1m at
depth deeper than 100m. Resolution in ft is
always 1ft

- Temperature compensation of the
measurement between -10 °C to +50 °C /
14°F to 122 °F

- Accuracy from 0 to 80m/262ft: 1% ±0.2m/1ft

Temperature measurement:

- Measurement range: -10 °C to +50 °C /
14°F to 122 °F

- Resolution: 1 °C / 1 °F

- Accuracy: ± 2 °C / ± 4 °F

Clock: quartz clock, time, date, dive time
display up to 999 minutes

Oxygen concentration: adjustable between 21%
and 99%, ppO

2

max range between 1.2 and 1.6bar

Logbook memory: 35hours of dive profile at
5-second sampling rate

Operating temperature: -10 °C to +50 °C /
14°F to 122 °F

Storage temperature: -20 to 70 °C / -4 to 158°F
Display:

- Diagonal: 31 mm / 1 1/4"

- Mineral glass

Power supply:

- CR2430 user-replaceable battery

- battery life: 800-1000 dives in one year,
200-300 dives over two years, 50 dives over
3 years. If sleep mode is activated between
dive sessions, 300 dives over 6 years. Actual
battery duration depends on the usage of
the backlight and the water temperature.

4.2. MAINTENANCE

The depth accuracy should be verified by an
authorized Mares dealer every two years Aside
from that, Smart is virtually maintenance free.
All you need to do is rinse it carefully with
fresh water after each dive (avoid any chemical
products) and replace the battery when
needed. To avoid possible problems with your
Smart, the following recommendations will
help assure years of trouble free service:

- avoid dropping or jarring your Smart;

- do not expose Smart to intense, direct
sunlight;

- do not store Smart in a sealed container,
always ensure free ventilation.

NOTE

If you notice signs of moisture on the
inner wall of the mineral glass, take your
Smart immediately to an authorized Mares
service center.



WARNING

The mineral glass is not exempt from
scratches resulting from improper use.

Smart Dive Computer

16



WARNING

Do not blow compressed air onto Smart,
because it could damage the pressure
sensor area.

4.2.1. REPLACING THE BATTERY IN SMART



WARNING

REPLACING THE BATTERY IS A VERY
DELICATE OPERATION, AND WHEN
PERFORMED BY AN INEXPERIENCED
PERSON MOST LIKELY WILL LEAD TO A
FLOODED COMPUTER. WE STRONGLY
RECOMMEND THAT YOU VISIT AN
AUTHORIZED MARES CENTER. MARES
DECLINES ALL RESPONSIBILITY FOR ANY
DAMAGE CAUSED BY REPLACING THE
BATTERY.

NOTE

Do not discard the old battery in the
environment. Mares adopts a policy of
respect for the environment, and urges
use of the appropriate separated waste
collection service.



WARNING

When changing the battery, the o-ring must
be replaced. The Smart battery kit contains
a high quality CR2430 battery and a new
o-ring. All computer o-rings are inspected
individually for integrity.

Follow these steps and refer to the pictures:
a) Remove the center screw as shown, then

remove the strap. Note that only one side
of the strap needs to be removed. We
recommend removing the one without buckle.

b) Remove the two screws near the padlock

symbols. These hold the battery cover in
place.

NOTE

Do not remove the screws denoted with !

c) Use a small flat-head screwdriver to pry

open and lift the cover on the side where you
removed the strap.

d) Remove the cover then remove the o-ring.

Discard the o-ring.

e) Remove the battery by prying it loose with a

small flat-head screwdriver.

f) Replace the battery with the new one from

the kit. The battery should click in place.
Make sure to respect the correct polarity
of the battery: the “+” has to be facing
outwards.

CLICK

g) Position the new o-ring from the kit in the

groove around the battery, ensuring that it
sits towards the outer edge of the groove.

h) Position the cover onto the watch case and

press it down evenly. Ensure that in the area
of the screws the cover touches the watch
case.

NOTE

Do not lubricate the o-ring! Lubrication
causes the o-ring to twist when the cover is
put over it, causing the watch to flood.

17

i) Keep the cover pressed onto the watch case

while hand tightening the two screws. Don’t
use excessive force while tightening. Ideal
torque is 12 N cm / 17 oz-in.

j) Reposition the strap which was removed in

step a). For best results put a drop of Loctite
331 onto the thread of the screw. Hand
tighten without using excessive force. Ideal
torque is 15 N cm/21 oz-in.



WARNING

Mares reserves the right to refuse to
provide service under the warranty if the
maintenance instructions are not followed.

4.3. WARRANTY

Mares products are guaranteed for a period of
two years subject to the following limitations
and conditions:

The warranty is non-transferable and applies
strictly to the original purchaser.

Mares products are warranted free from
defects in materials and workmanship:
components that, upon technical inspection,
are found to be defective, will be replaced free
of charge.

Mares S.p.A. declines all responsibility
for accidents of any kind that result from
tampering or incorrect use of its products.

Any products returned for overhaul or repairs
under warranty, or for any other reason, must
be forwarded exclusively via the vendor and
accompanied with a proof of purchase slip.
Products travel at the risk of the sender.

4.4. WARRANTY EXCLUSIONS

Damage caused by water seepage resulting
from improper use (e.g. dirty seal, battery
compartment closed incorrectly, etc.).

Rupture or scratching of the case, glass or
strap as a result of violent impact or blows.

Damage resulting from excessive exposure to
elevated or low temperatures.

Damage caused by the use of compressed air
to clean the dive computer.

4.5. HOW TO FIND THE PRODUCT
SERIAL NUMBER

To see the product serial number, enter the
INFO submenu.

• 5. DISPOSAL OF THE DEVICE

Dispose of this device as electronic waste. Do
not throw it away with regular rubbish.

If you prefer, you can return the device to your
local Mares dealer.

Mares S.p.A. - Salita Bonsen, 4 - 16035 Rapallo (Ge) - ITALY - Tel. [phone] - Fax [phone]

www.mares.com

code 44201308 - 0.000 - Rev. A - 10/16 - Artbook 13035/16

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