Seac ACTION User manual

OS / WINDOWS COMPATIBLE

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Contents
ACTION MANUAL.................................................3
GENERAL WARNINGS.......................................3
HARDWARE .............................................................6
APPLICATION SOFTWARE..............................7
TECHNICAL CHARACTERISTICS ................8
Dive modes ...................................................................8
Decompression Algorithm ................................9
Levels of Protection ................................................9
Repetitive Dives ......................................................... 9
Dives with Surfacing ..............................................9
NDL - NonDecompressionLimit ..................9
Safety Stop ....................................................................10
Deep Stop........................................................................11
TTS........................................................................................11
Ascent Speed Alarm................................................12
MOD Exceeded Alarm...........................................12
Deco Violation Alarm..............................................13
Locking the Computer...........................................13
No-fly time.......................................................................14
Desaturation Time..................................................... 14
Permitted Altitude Indicator...............................15
Battery/Run-time....................................................... 15
Time and Time Zones.............................................16
Planner...............................................................................17
Divelogger .......................................................................17
KEYS NOMENCLATURE ...................................17
MENU AND SETTINGS......................................18
User Data Memory: ................................................18
Stopwatch........................................................................19
Logbook ............................................................................20
MIXES .................................................................................20
Dive parameters (DIVESET)............................. 22
Dive planner (PLANNER) ...................................23
Alarms (ALARMS).....................................................24
Display................................................................................24
System Settings (SYS SET) ...............................25
PC Mode........................................................................... 26
Info mode.........................................................................26
Reset.................................................................................... 26
OFF (FACTORY MODE)....................................... 27
USER SETTINGS RANGE .................................28
ACTION DURING THE DIVE ...........................29
SCUBA (OC) DIVE ................................................30
1. NDL Dive .....................................................................31
2. Deep Stop ..................................................................32
3. Safety Stop ................................................................33
4. DECO Dive................................................................ 34
5. Mix change during the dive..........................35
DIVE IN GAUGE MODE .....................................36
DIVE IN FREE MODE ..........................................37
AFTER THE DIVE...................................................38
Desaturation Time..................................................... 38
No-fly time.......................................................................39
Logbook ............................................................................40
Connect your ACTION computer to your
Mac or PC........................................................................41
REPLACING THE BATTERY.............................42
ACTION SERIAL NUMBER...............................43
CE CERTIFICATION..............................................43
CARE AND MAINTENANCE............................43
CERTIFICATE OF WARRANTY.......................44

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ACTION MANUAL
Congratulations on your purchase of a SEAC diving computer.
The SEAC ACTION 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!
The computer does not replace an understanding of decompression
tables, which divers must always carry with them for safety, along with a
depth gauge and a dive watch.
• WARNING!
The SEAC computer is an auxiliary device during a dive. Therefore, it is
crucial that each diver always carry with them a suitable table that will
enable them to conduct the decompression phase if the unit should
malfunction.

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• WARNING!
Freediving entails risks of syncope, taravana, pulmonary edema, and
hemoptysis, while diving with a respirator involves risks related to
decompression sickness, oxygen toxicity, nitrogen narcosis, and in general
other risks connected to the dive itself: 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.
• 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!
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 shown 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).

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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, with the consequence that
the NDL/Deco data may also be inaccurate.
In DIVE 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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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
Alarm Type: Audible and visual.
PC/Mac connection: Serial via USB with special dedicated cable
(optional).
Maximum operating depth 100 meters/328 ft

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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, though combination of buttons\time.
Decompression Algorithm: Buhlmann ZHL-16C for Air/Nitrox.
Levels of conservatism: Yes, based on Gradient Factor.
Mixes Managed: Air/Nitrox, #2 (O2maximum 99%).
Dive modes: Scuba, Gauge and Apnea.
Safety Stop: Yes, user-customizable
(depth and duration).
Deep Stop: Yes, based on maximum depth reached.
Water Type: Salt/Fresh.
Alarms: MOD Violation, Ascent Speed, Deco Stop
Violation.
LogBook Sampling: Scuba/Gauge => 5 seconds;
Freediving => 2 seconds.
LogBook Capacity: Capacity approx. 40 hours (Scuba/Gauge
mode) or approx. 18 hours (Freedive mode).
Planner: NDL Aria/Nitrox Calculation.
Stopwatch: START \ STOP \ RESET \ LAP.
Set Backlighting: Auto / Manual / Dive.
Units: Metric / Imperial.
Watch: 24/12 hour format, dual time.
Reset: Tissues/Settings.

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TECHNICAL CHARACTERISTICS
Dive modes
The computer manages three dive modes:
I. Scuba mode:
Dive: When depth exceeds 150 cm/5 ft.
Emerge:when depth is less than 90 cm/3 ft.
II. Gauge mode:
Dive: when depth exceeds 150 cm/5 ft.
Emerge: when depth is less than 90 cm/3 ft.
III. Free Mode:
Dive: when depth exceeds 100 cm/3.3 ft.
Emerge:when depth is less than 50 cm/1.6 ft.
After a dive in SCUBA / GAUGE mode, the Computer stays on the SCUBA /
GAUGE screen for 10 minutes after emerging, and therefore you cannot access
the menu and submenu.
After a dive in FREE mode, the Computer stays on the FREE screen for 15 minutes
after emerging, and therefore you cannot access the menu and submenu.
After a dive in SCUBA or GAUGE mode, FREE mode is inhibited and is not
accessible for the next 12 hours.
After a dive in GAUGE mode, because tissue saturation is calculated assuming
that the dive uses mix number 1, SCUBA mode is available.
After a dive in GAUGE mode, the Desaturation and NoFly times are updated with
the new tissue saturation data. In particular, the NoFly time is set to 24 hours,
as a precaution in favor of safety, regardless of the type of profile that was run.
After a dive in FREE mode, the residual Desaturation and NoFly time, if any
existed before the dive in FREE mode, will be left unchanged.

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If you Reset the Settings, the Computer will automatically start in SCUBA mode.
When the Computer is in Watch mode and you dive without manually
entering dive mode (using the LR button), the Computer will automatically
launch the mode you selected most recently.
Decompression Algorithm
The computer uses the original Buhlmann ZHL-16C Decompression Algorithm,
unmodified.
Levels of Protection
The Action allows you to select 6 levels of protection (conservatism), from 0 to 5.
Level 5 provides the maximum protection.
Repetitive Dives
All dives taken within a 48-hour period are considered “Repetitive Dives”.
Dives with Surfacing
“Surfacing” is defined as the situation in which the diver emerges after having
begun a Scuba type of dive.
Surfacing ends if the diver dives again within a period of fewer than ten minutes
from emerging; beyond this limit the current dive is considered ended.
If you change mixes during the dive and dive again within the 10 minute
Surfacing time, the mix in use is reset to the starting mix.
NDL - NonDecompressionLimit
The “NonDecompressionLimit” is defined as the time that remains at the
current depth and breathing the mix that is currently set to avoid requiring
decompression.
To avoid requiring decompression stops, the time required for the ascent must
be subtracted from the NDL.

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Safety Stop
The user can set both the depth and the duration of the Safety Stop.
NOTES:
a) The Safety Stop is calculated and proposed if the maximum depth reached is
greater than 12 meters/40 ft.
b) The Safety Stop is shown when the diver comes within 9 meters/30 ft of the
surface.
c) The countdown begins if the diver arrives within +2 meters/+6.5 ft and
-2 meters/-6.5 ft of the stop depth set. For example: If the stop set is 5
meters/16.5 ft, the countdown starts between 7 meters/32 ft and 3 meters/10
ft. In this case then, if you go to a depth of less than 3 meters/10 ft., the stop
will be canceled.
d) The Safety Stop is not calculated and is not proposed if at least one deco stop
is underway within 9 meters/30 ft from the surface.
e) If the current dive includes one or more decompression stops, and if these
decompression stops are cleared during the ascent (before reaching 9
meters/30 ft) because of a very slow ascent or in any case a multilevel dive,
then the Safety Stop is calculated and proposed at the time and duration set
by the user.
f) If the Diver again exceeds a depth of 9 meters/30 ft after having performed
the stop, the Safety Stop is recalculated and reproposed in accordance with
the rules described above.
g) If the Diver descends to a depth greater than 9 meters/30 ft during the
countdown, it will be reset and recalculated according to the rules above.

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Deep Stop
If the Deep Stop is enabled, it is calculated as a 2-minute-and-30-second stop at
half the maximum depth reached if the following conditions are met:
- Maximum depth reached greater than 18 meters/59 ft.
- There are no mandatory decompression stops during the ascent.
NOTES:
a) The Deep Stop is displayed at +5 meters/+16.5 ft and -3 meters/-10 ft from
the calculated stop. In other words, if the Deep Stop is at 20 meters/66 ft, it is
displayed in the range from 17 meters/56 ft to 25 meters/82 ft.
b) The countdown to the stop begins when the diver arrives in a range of +2
meters/+6.5 ft and -2 meters/-6.5 ft from the calculated stop depth. For
example: if the stop is calculated at 25 meters/83 ft, the count down is
performed in the range of 27 meters/89 ft to 23 meters. If the Diver moves -2
meters/-6.5 ft from the stop depth (meaning lower than 23 meters/75.5 ft), it
is canceled. If the Diver arrives within 27 meters/89 ft - 31 meters/102 ft, the
countdown is suspended.
c) If the Diver again exceeds the stop depth by more than 6 meters/20 ft (or
in any case, 18 mt/59 ft), the stop will be recalculated according to the rule
above.
TTS
The “TTS” is the total time to surface, and accounts for the entire time for
executing mandatory decompression stops (calculated according to user
settings) and the ascent time (calculated at a constant velocity of 9m/min - 30
ft/min).

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Ascent Speed Alarm
The standard maximum ascent speed is set at 9 meters/minute - 30 ft/min.
The Ascent Speed Alarm indicates the ascent speed using icons, and is only
available in SCUBA mode.
The Ascent Rate icon consists of 3 arrows.
The Ascent Speed Alarm is both visual and audible.
The visual alarm cannot be disabled.
Users can disable the audible alarm.
The rules for the Ascent Speed Alarm are:
- Speed <= 3m/min- 10ft/min: No indication
- 3m/min- 10ft/min < Speed <= 6m/min-20 ft/min: One arrow
- 6m/min -20ft/min < Speed <= 9m/min- 30ft/min: Two arrows
- 9m/min- 30ft/min < Speed <= 12m/min 40ft/min: Three arrows
- Speed > 12m/min – 40 ft/min: Three flashing arrows + Audible alarm
MOD Exceeded Alarm
The “MOD” defines the maximum operating depth for the mix in use and is
calculated as a function of the real surface atmospheric pressure and the PpO2
(oxygen partial pressure) set for the mix in use.
The alarm for Exceeding the MOD is visual and audible.
The visual alarm cannot be disabled; this is indicated by the field for the current
depth flashing.
Users can disable the audible alarm.
Both alarms are activated as soon as the MOD is exceeded.

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Deco Violation Alarm
The Deco Violation Alarm will trigger when the Diver reaches a depth less than
(in absolute value) that set by the mandatory decompression stop.
The Deco Violation Alarm is visual and audible.
The visual alarm cannot be disabled; this is indicated by the field for the current
depth flashing.
Users can disable the audible alarm.
Both alarms will trigger when the Diver reaches a depth less than (in absolute
value) 0.5 meters/1.6 ft of the mandatory decompression stop indicated.
The alarm does not trigger for Deep Stops and Safety Stops, because these
stops are not mandatory.
Locking the Computer
If decompression stops are omitted, rather than immediately switching to lock
mode like other dive computers, Action applies penalty points that eventually
result in locking the SCUBA mode upon reaching 150 points.
The penalty points are assigned as follows:
- 5 points for every 5 seconds, if the diver's current depth is lower than one
meter/3 ft from the stop level indicated.
- 10 points for every 5 seconds, if the diver's current depth is lower than two
meters/6.5 ft from the stop level indicated.
This means that for an ongoing violation, Action will enter lock mode after about
2 minutes at a depth lower than one meter/3 ft, and after about 1 minute if the
stop depth violation is 2 meters/6.5 ft, naturally only if the violation is occurring
in the direction of the surface.
Once it reaches 150 points, the computer switches to lock mode.
The diver will be notified during the dive with an “Alert” icon and a message,
alternating with information about remaining decompression, indicated by the
words “WARNING DECO VLT”.
Decompression will still be calculated until the end of the dive where anticipated
by the Buhlmann mathematical model.

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• WARNING:
two repetitive dives with surface times of fewer than 10 minutes are
considered to be a single dive.
If the mandatory decompression stop is violated during the dive and the
computer switches to lock mode, SCUBA mode will not be available for 18 hours.
After this period, the counter to put the watch out of service will be reset at the
beginning of the next dive.
If you begin a new dive in SCUBA mode before this interval, when the computer
is still in lock mode, the “Alert” icon and the message reading “WARNING
DECO VLT” will be displayed for the entirety of the dive, without alternating with
the decompression data.
Whenever the computer is locked, the NoFly and Desaturation times are not
shown.
No-fly time
NoFly time is calculated according to the following rules:
- 12 hours for a single dive (no dive in the preceding 48 hours) within the no-
decompression limits.
- 18 hours for repetitive dives without decompression on the same day or multiday.
- 24 hours for repetitive dives with decompression on the same day or multiday.
For more information, consult the "No-fly Time" section in the "After the Dive"
chapter.
Desaturation Time
The tissue Desaturation Time is calculated immediately at the end of the dive.
It is defined as the time necessary for the nitrogen inert gas pressure to be lower
than the Partial pressure of nitrogen (PpN2) breathed, increased by a tolerance
factor.
For more information, consult the "Desaturation Time" section in the "After the
Dive" chapter.

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Permitted Altitude Indicator
The Permitted Altitude is calculated and updated after dives as follows:
The Permitted Altitude icon is shown in Watch mode, and is managed as follows:
- Max 1000 m/3290 ft: 1 triangle on.
- Max 2000 m/6580 ft: 2 triangles on.
- Max 3000 m/9870 ft: 3 triangles on.
- No Limit: icon o (not displayed).
Battery/Run-time
The computer is powered by a 3V CR2450 MAXCELL Asia Product 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, PC connections,
and updates are used.
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:

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Mode Theoretical average run-time
(years)
Factory Mode 8.4
Watch 3.0
100 dives/year 2.9
200 dives/year 2.7
300 dives/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.
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 SCUBA/GAUGE/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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Planner
Action's Planner lets you simulate and plan a dive, displaying the NDL time
(within non-decompression limits) depending on the depth set.
The Planner allows you to plan Air/Nitrox with NDL only, meaning within the
non-decompression limits, and therefore requiring no decompression time.
The input data (mix, Max PpO2, and level of conservatism) are entered in the
various submenus (“MIX”, “DIVE SET”) and are used to calculate the NDL.
The calculated NDL accounts for descent performed at 18 meters/minute 59 ft/
minute.
The calculated NDL does not include the time required for the ascent.
In Planning mode, you can only change the dive depth and the surface time.
The NDL Time display is updated immediately whenever the dive depth or
surface interval is changed.
Depths greater than 45 meters/150 ft cannot be entered.
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 Action to a PC you need
a special USB cable that can be purchased separately.
KEYS NOMENCLATURE
HR
LR
HL
LL

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MENU AND SETTINGS
Methods for entering all the settings menus listed below:
• From the “watch” display, press the LL (Mode) key 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 (Mode).
• From any position you're in, press the LL (Mode) and LR (Reset/-) buttons at
the same time to return to the main screen (watch).
LAYOUT CHRONO SURF WATCH MODE
FROM ANY
MODE
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 is restored on reboot are at
most 15 minutes old, so the time will only need to be adjusted manually by a
few minutes.

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Stopwatch
The stopwatch can only be activated from WATCH, GAUGE DIVE, and FREE
DIVE modes, and not from SCUBA DIVE mode.
To switch to the stopwatch function, press the HR button from one of the modes
listed above.
LAYOUT CHRONO SURF WATCH MODE

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Logbook
The computer memory intended for saving SCUBA/GAUGE/FREE dives taken
is limited to:
- approx. 40 hours (Scuba/Gauge mode). Sampling time every 5 seconds.
- approx. 18 hours (Freedive mode). Sampling time every 2 seconds.
If the memory becomes completely full, the oldest dives will be deleted to make
room for new dives.
When you enter the “Logbook” submenu, you will see:
- at the top: the duration of the dive, the max depth, and the mode icon (OC,
Scuba, or Gauge).
- in the center: No. of the dive displayed in the memory, and date and time of the
dive.
- at the bottom: the temperature and average depth of the dive.
When you press the LL button on the lower left, in place of the temperature you
will see the oxygen percentage set for that dive.
MIXES
Action manages up to two gas mixes with oxygen percentages (O2) from 21% to
99% and oxygen partial pressure (PpO2) from 1.2 to 1.6 bar.
When you enter the “MIX1” submenu, the number of the oxygen percentage for
this gas mix will flash. This can be set by using the HR (+) and LR (-) buttons.
Fields for setting O2from 21% to 99%. The upper right of the screen shows the
MOD, meaning the maximum operating depth for the O2percentage selected
and for the PpO2selected, which can be set by pressing the LL button (Mode)
once:the PpO2number will flash, and you can select the desired value using
the HR (+) and LR (-) buttons. Setting range from 1.2 to 1.6 bar in increments
of 0.5 bar. When the PO2is also selected, press the LL button once to move to
the “MIX2” screen. Using the same methods used for MIX1, set the O2and PO2
percentage. Then you can press the LL button (Mode) once to activate MIX2 by
selecting ON or OFF with the HR or LR buttons.