Seac APNEA HR User manual

APNEA HR
APNEA
www.seacsub.com
ISTRUZIONI - INSTRUCTIONS
INSTRUCTIONS - INSTRUCCIONES
ANLEITUNG - ΟΔΗΓΙΕΣ
OS / WINDOWS COMPATIBLE

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Table of Contents
FREEDIVING MANUAL ......................................3
GENERAL WARNINGS....................................... 3
SWITCHING ON THE APNEA......................... 6
TECHNICAL CHARACTERISTICS ................6
HARDWARE .............................................................6
APPLICATION SOFTWARE.............................. 7
FUNCTIONS OF THE APNEA COMPUTER..8
Software ............................................................................ 8
Logbook ............................................................................10
Fitness function: step counter..........................10
Reboot................................................................................ 11
Battery/Run-time....................................................... 11
Time and Time Zones.............................................13
DiveLogger .....................................................................14
KEYS NOMENCLATURE ...................................14
MENU AND SET TINGS......................................14
User Data Memory: ................................................15
Stopwatch timer - Chrono..................................15
Countdown - CDT DWN......................................16
Alarm - CLK ALM......................................................17
Alarms (ALARMS).....................................................17
Display................................................................................18
System settings (SYSTEM) ................................19
PC Mode........................................................................... 20
Info mode.........................................................................21
Reset.................................................................................... 21
OFF (factory mode)..................................................22
DIVE PARAMETERS ...........................................23
Freeset................................................................................23
USER SETTINGS RANGE .................................24
APNEA DURING THE DIVE .............................25
DIVE IN FREE MODE ..........................................25
AFTER THE DIVE...................................................28
Logbook ............................................................................28
Connect your APNEA computer to your
Mac or PC........................................................................29
Fitness function: step counter..........................30
REPLACING THE BATTERY.............................31
APNEA SERIAL NUMBER................................. 32
EC CERTIFICATION..............................................32
CARE AND MAINTENANCE............................ 32
CERTIFICATE OF GUARANTEE.....................33

APNEA
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FREEDIVING MANUAL
Congratulations on your purchase of a SEAC diving computer.
The SEAC Apnea dive computer is a technologically advanced device designed
and manufactured to provide all the information that every diver needs.
Periodically check www.seacsub.com for any updates to this manual.
GENERAL WARNINGS
• WARNING!
Read the user manual fully before using the SEAC computer.
Using the computer incorrectly will void the warranty and can
permanently damage the computer.
• WARNING!
Only use the dive computer after you have read all sections of the
instruction manual and you have understood how it works.
• WARNING!
The dive computer is not a substitute for diver training and should only be
used by divers who have been properly trained and who have earned the
appropriate license issued by a Certified Teaching Association.
• WARNING!
Freediving entails risks of syncope, taravana, pulmonary edema, and
hemoptysis, and in general other risks related to diving: even a thorough
reading of this manual and use of the instrument does not exclude
potential dangers.
• WARNING!
The computer cannot take into account individual physiological changes
that can change from one day to the next. For this reason it's good
practice to use the device conservatively and cautiously, remaining within
the limits shown by the computer in order to minimize the risks.

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• WARNING!
It is strictly forbidden to freedive in the 12 hours after diving with scuba
equipment!
Violating this rule could considerably increase the risk of decompression
sickness.
• WARNING!
No fly time after a freediving session
Because no in-depth hyperbaric studies are available that are suicient to
evaluate the safety of flying for freedivers, in order to avoid decompression
sickness following deep freedives, it is recommended that you wait 18 to
24 hours before boarding a plane, depending on the total dive time, the
number of dives, and the average depth of the session.
Even for sessions with depths of less than 15-20 mt/50-65 ft and a limited
number of dives, a pre-flight interval of at least 12 hours is recommended.
You should stay consistently up-to-date on DAN updates and instructions.
• WARNING!
Do not share one computer between two divers during the dive. Every
diver must have their own instrument to provide information and save
only that diver's data.
• WARNING!
Before diving, you must check the battery charge. Do NOT dive if the low
battery icon is visible on the display. Always check that the display shows
no signs of any malfunction and that it is clearly legible.
The Battery icon on the display has 2 segments:
Segment 1: Battery Outline ==> Battery lower than Minimum Voltage (do
not dive).
Segment 2: First Bar from the bottom ==> Battery lower than 2.1V (Low
level. The voltage could plummet during a dive in especially cold water).

APNEA
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• WARNING!
Always check that the settings are correct for your dive, and don't allow
anyone else to tamper with your computer before the dive. If it has been
tampered with by another person, check that your settings are correct.
• WARNING!
It is important to keep in mind that your body undergoes changes, even
daily changes, that a computer cannot account for. If your physical
condition is not excellent, or if you feel any physical problems, do not
dive!
• WARNING!
The normal functions of the product could be disturbed by strong
electromagnetic interference.
In this case, simply reboot the product to restore normal function,
following the instructions provided in this manual (see “Reset”) and use
the product in another position.
• WARNING!
Strictly avoid pressing on the side grill of the sensor with your fingers,
especially if the sensor compartment is full of water, because this could
distort the measurement of zero, and could therefore result in an incorrect
measurement of depth during the next dive.
In FREE mode, if you notice a measurement of anything other than
zero on the surface, you need to reset the device to zero out the sensor
measurement (see the instructions and warnings on using the RESET
further on in this manual) or wait a few hours for the system to reestablish
the correct zeroing.

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SWITCHING ON THE APNEA
If the display is o, press the LL and
HR buttons at the same time until it
turns on.
TECHNICAL CHARACTERISTICS
HARDWARE
Type: Wristwatch computer.
Screen: LCD Icons/Segments/Transflective matrix
with user-adjustable contrast.
Backlighting: LED, user-adjustable.
Battery: CR2450, non-rechargeable, 3V 600mAh,
user-replaceable (we strongly recommend
that you have this done at an authorized
SEAC center, also replacing the O-ring in the
battery compartment).
Buttons: 4
Pressure/Temperature sensor: Piezoresistive.
Alarm Type: Audible and visual.
PC/Mac connection: Serial via USB with special dedicated cable
(optional).
Accelerometers: 3-axes
Min/max usage temperature: -10°C (14°F)/ 60°C (140°F)
Min/max storage
temperature:
-20°C (-4°F)/ 70°C (158°F)
Maximum operating depth: 100m/328 ft

APNEA
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APPLICATION SOFTWARE
Updates: Supported through serial port via USB.
Factory mode: Supported to save energy, can be set by
the user.
Auto Recovery: Automatic reboot if software locks.
Restore: Manual, through combination of buttons/
time.
Dive modes: Freedive (with MSST “Minimum Suggested
Surface Time”).
Water Type: Salt/Fresh.
Alarms: Dive time, Dive depth, MSST violations,
Alarm clock, Countdown.
LogBook Sampling: Freediving = every 2 seconds or every
second (user can set).
LogBook Capacity: Capacity approx. 30 hours with sampling
every 2”
Stopwatch: simple START \ STOP \ RESET \ LAP.
Countdown: resolution to one second.
Fitness Function: Basic step counter
Set Backlighting: Auto / Manual / Dive.
Units: Metric / Imperial.
Watch: 24/12 hour format, dual time.
Alarm: Daily.
Reset: Tissues/Settings.

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FUNCTIONS OF THE APNEA COMPUTER
Software
a) MSST Minimum Suggested Surface Time
The MSST is minimum interval of time on the surface that is suggested between
two dives to reduce freediving risks.
• WARNING!
The minimum suggested recovery times between two dives indicated by
the MSST calculation can reduce, but not eliminate, the risks of accidents
caused by freediving, such as syncope, Taravana, and/or hemoptysis,
because there are many other factors to consider, such as age, body
mass, training, physical condition, pre-existing medical conditions (both
known and unknown to the diver), and more, which the Apnea computer
software cannot calculate.
The MSST is calculated dierently for two depth brackets:
• To a depth of 30 meters or less, the MSST is twice the dive time in seconds,
rounded up to the next whole minute. That means that for a dive with a dive
time of 1 minute 40 seconds, the MSST is 4 minutes.
• For depths greater than 30 meters, it is the maximum depth reached during
the dive divided by 5 and rounded up to the next whole minute. So, for a dive
to a maximum depth of 41.00 meters, the MSST will be 9 minutes.
Calculation of the MSST is enabled by default. It can be disabled using the
corresponding option in the “FREE SET” menu.
When MSST is active it will be displayed in the middle of the screen with the
label “MSST” flashing until the countdown has concluded (the clock reaches
00:00).

APNEA
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b) Hydration
• WARNING!
It is well known that dehydration, along with other freediving conditions
and the freediver's physical condition, can contribute to freediving
accidents. To reduce these risks, the Apnea computer periodically
reminds the freediver to hydrate by drinking water.
In every session, the reminder to hydrate will be displayed about every
2 hours.
The 2-hour interval count starts at the beginning of the first dive in the
session.
The reminder is only visual, cannot be deactivated beforehand in the SET
menu, and only appears while on the surface between two dives.
Press any button to clear the reminder.
To avoid the reminder being closed manually, it is shown on the surface.
The countdown for the next 2-hour interval will start when the previous
reminder is closed.
c) MSST Alarm
The audible alarm for an MSST violation is emitted when the freediver goes back
under water before the MSST elapses.
This alarm stops automatically after 10 seconds, or can be stopped manually by
pressing any button.
This alarm can be switched o in the ALARMS menu.
MSST violations do not result in penalties in the calculation of the next MSST.
b) Depth Exceeded Alarm
The Depth Exceeded audible alarm sounds when the freediver exceeds the
depth value set in the corresponding section of the ALARMS menu, if activated.
This alarm stops automatically after 30 seconds, or can be stopped manually by
pressing any button.
This alarm can be switched o in the ALARMS menu.

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e) Dive Time Exceeded Alarm
The Dive Time Exceeded audible alarm sounds when the freediver exceeds
the Dive Time value set in the corresponding section of the ALARMS menu,
if activated.
This alarm stops automatically after 30 seconds, or can be stopped manually by
pressing any button.
This alarm can be switched o in the ALARMS menu.
Logbook
• Approx. 30 hours with sampling every 2 seconds, or approximately 15 hours
with sampling every second.
If the memory becomes completely full, the oldest dives will be deleted to make
room for new dives.
Fitness function: step counter
The step counter is a stand-alone application and only starts running when
the user is in that application. Therefore, the application does not run in the
background.
For the most precise calculation, it's important to set the “Height and Weight”
values correctly.
The step counter application consumes battery more quickly.
Step counting is based on the interpretation of data provided by the
accelerometer only. Therefore, step counting accuracy has some limitations:
• It depends strictly on where the watch is worn (wrist, belt, ankle, etc.).
• It depends strictly on how the user wears it (for example, a watch that is loose
around the wrist will not count steps correctly).
• It also depends on the type of activity. Certain activities generate false positives
(moving the hands, car/motorcycle/train/subway trips, washing dishes, etc.).
• It depends on how long the activity lasts. Steps are only counted once a given
number have been detected in a row.
• The accuracy of the step counter application cannot be guaranteed for 100%
of the population because individual users walk and move dierently.
• The maximum identification frequency of steps is 3Hz (3 steps per second).

APNEA
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Step counter data are displayed in the following range:
• 0-99999 steps.
• Exercise duration (hours:minutes) 00:00 – 99:59
• Calories (kcal) 0-99999
• Distance: 0.0 – 99.99 (km or mi)
Reboot
There are three ways to reboot:
• Manually: long-press the HR / LR / LL buttons at the same time for at least
20 seconds.
• WARNING!
End users should only reboot this way in special situations, for example
when asked to do so by an authorized Seac technician in an online
technical support session to solve a problem with the device.
• Automatically: in the event of Application Software errors to prevent “Freezing”
(this is an indication of an electronic defect or a bug).
• Commanded by computer: when updates are required.
Battery/Run-time
The computer is powered by a 3V CR2450 battery with a nominal capacity of
600 mAh.
The battery capacity varies based on environmental conditions.
The battery run-time varies depending on how the product is used and which
functions are used.
The run-time drops noticeably when backlighting, audible alarms, step counter,
PC connections, and updates are used.

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When the Software Application is launched, a test of the battery under load
is performed. When this happens you may notice the backlighting turn on
temporarily. If the battery voltage under load is less than 2.0V (Minimum
Voltage), the device will remain o or locked, on a screen with the words “LOW
BAT”. In some cases you may see a continuing Reset for a few cycles.
If the battery voltage under load is below 1.8V (Start Voltage), the backlighting
may remain on continuously until the computer battery is completely drained. In
this case, the computer will not turn on at all and no text appears on the LCD.
The Battery icon on the display has 2 segments:
Segment 1: Battery Outline ==> Battery lower than Minimum Voltage (do not
dive).
Segment 2: First Bar from the bottom ==> Battery lower than 2.1V (Low level.
The voltage could plummet during a dive in especially cold water).
Theoretical run-time, linked strictly to the quality of the battery installed:
Mode Theoretical average run-time
(years)
Factory Mode 8.4
Watch 3.0
100 sessions/year 2.9
200 sessions/year 2.7
300 sessions/year 2 .1
The data indicated above:
• refer to a new battery of recent manufacture (and therefore not subject to
excessive auto-draining);
• refer to use at 25°C/77°F;
• refer to use that does not entail direct exposure to sunlight;
• do not include consumption by backlighting and audible alarms.

APNEA
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Time and Time Zones
The computer can handle two time zones:
• Local Time: Time at the user's location.
• Home Time: The time at home.
The reference time is always the LOCAL time, and is indicated in the center of
the Watch screen, or in secondary screens during FREE dives.
The Home time can only be changed by editing the value of the “UTC HOME”
time zone in the “SYS SET” menu.
If “UTC LOC” and “UTC HOME” are the same, only one time is shown on the
Watch screen.
If the two parameters do not match, the LOCAL Time is shown in the center of
the screen (the date indicated refers to this Time), while the HOME time is shown
on the lower right.
If the date for each of the two Times is dierent, the date oset from the HOME
Time will be shown on the lower right: “+1 / -1”.

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DiveLogger
Dive data can be downloaded to be saved, viewed, and processed. The software
for both Windows 10 and Mac is available for free download on the website www.
seacsub.com. However, to connect the Apnea to a PC you need a special USB
cable that can be purchased separately.
KEYS NOMENCLATURE
HR
LR
HL
LL
MENU AND SETTINGS
Methods for entering all the settings menus listed below:
• From the “watch” display, press the LL (Menu/Scroll) button once. LOG
will appear on the display. From here, press the LR button multiple times
(RESET/-) until the name of the desired function appears on the display. At
this point, to enter the corresponding setting/editing submenu, confirm your
choice with the LL button (Menu/Scroll).
• From any position you're in, press the LL (Menu/Scroll) and LR (Reset/-)
buttons at the same time to return to the main screen (watch).
LAYOUT CHRONO WATCH MODE
FROM ANY
MODE

APNEA
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User Data Memory:
The computer settings data that the users enters/edits, the tissue data, and the
current date/time are saved every 15 minutes.
Therefore, if you change the battery, the data that are restored on reboot are
at most 15 minutes old, so the time will only need to be adjusted manually by
a few minutes.
Stopwatch timer - Chrono
The stopwatch can run in the background, even when the step counter is
running (by activating it before the step counter).
To enter the stopwatch function from the watch screen or the dive screen (FREE)
press the HR button followed by the LR button until the word CHRONO appears.
Then confirm with the LL button.
LAYOUT CHRONO WATCH MODE

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Countdown - CDT DWN
The resolution of the countdown is in seconds.
It can be set to a maximum of 99 hours, 59 minutes, and 59 seconds.
Five seconds from the end of the time set, an audible alarm will sound each
second.
At the end of the countdown, another alarm will sound. This alarm stops
automatically after 30 seconds, or can be disabled manually by pressing any
button.
The countdown can run in the background even when using the step counter
(simply launch it first).
To enter the Countdown function from the watch screen, press the HR button
followed by the LR button until the words CDT DWN appear. Then confirm with
the LL button.
LAYOUT COUNTDOWN WATCH MODE

APNEA
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Alarm - CLK ALM
The alarm is daily, and is synchronized to local time.
Only one alarm can be set.
The alarm lasts 60 seconds and can be stopped early by pressing any button.
To enter the Alarm function from the watch screen press the HR button followed
by the LR button until the words CLK ALM appear. Then confirm with the LL
button. From here you can activate the alarm (ON/OFF) and set the time. Press
the LL and LR buttons at the same time to confirm, returning to the main screen.
Alarms (ALARMS)
• WARNING!
Apnea allows you to suppress audible alarms. However, we recommend
that you only make this choice after careful consideration and with
full awareness. Audible alarms are an important warning for possible
violations and behavior errors during the dive.
Press the LL button once, then the LR button twice. The word ALARMS will
appear in the center of the display. Next, press LL once to enter the submenu
where you can enable (ON) or disable (OFF) each, and set the depth and time
parameters:
• MSST alarm (ON-OFF)
• setting the depth limit and the alarm for when it is exceeded (ON-OFF)
• setting the dive time limit and the alarm for when it is exceeded (ON-OFF)
All the audible alarms can be enabled (ON) or disabled (OFF) using the HR or LR
buttons and confirmed using the LL button.
• WARNING!
Except for special situations, we do not recommend disabling audible
alarms.

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LAYOUT MENU: ALARMS
Display
BACKLIGHT BRIGHTNESS LEVEL (BKL LEV): Levels available from 0 to 3 (if
you select “0” backlighting will not activate)
BKL TIME: duration of the backlight in seconds in AUTO mode; selectable from
2” to 60”.
BKL MODE: 3 modes:
AUTO by choosing this option, the backlight will remain on for the preset
time.
MAN: the backlighting will be turned on/o manually using the HL button.
In watch mode, the backlighting will turn o automatically after 600 seconds.
DIVE: by activating this option, the backlighting will activate automatically
when the dive begins and will remain on for the full duration of the dive.

APNEA
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• WARNING:
intense use of the backlight will consume the battery faster, so it will not
last as long.
CONTRAST: 5 display contrast levels can be selected.
For each mode, set the choice using the HR (+) and LR (-) buttons and confirm
with the LL button (Mode) and move to the next selection. Press LL and LR at
the same time to return to the main view.
LAYOUT MENU: DISPLAY
System settings (SYSTEM)
The settings below are possible in this mode: hour/minute (TIME), date (DATE),
UTC second time zone (UTC LOC), UTC primary time (UTC HOME), 12/24 hour
format (FORMAT), unit of measure meters and °C -MTR or feet and °F –IMP
(UNITS).
The reference time is always the LOCAL time, and is indicated in the center of
the watch screen, or in secondary screens SCUBA/GAUGE/FREE during the
dive.
The Home time can only be changed by editing the value of the “UTC HOME”
time zone in the “SYS SET” menu.
If “UTC LOC” and “UTC HOME” are the same, only one time is shown on the
watch screen.
If the two parameters do not match, the LOCAL time is shown in the center of
the screen (the date indicated refers to this time), while the HOME time is shown
on the lower right.
If the date for each of the two times is dierent, the date oset from the HOME
time will be shown on the lower right: “+1 / -1”.
For each mode, set the choice using the HR (+) and LR (-) buttons and confirm

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with the LL button (Mode) and move to the next selection. Press LL and LR at
the same time to return to the main view.
LAYOUT MENU: SYSTEM
PC Mode
To connect your Apnea to a PC or Mac to link with the Dive Logger software and
download your data, your Apnea must be set to this mode before you connect it
to the computer with the special USB cable (optional).
LAYOUT MENU: PC