Omer-Sub MISTRAL User manual

1.0 Introduction
Read this instruction manual entirely, making sure you
fully understand the use and limitations of this
instrument. Improper use may cause serious injury or
death.
!IMPORTANT WARNINGS!
WARNING! OMERSUB recommends you get
proper certified training before attempting
breath holding diving and spearfishing. You are
the sole responsible for your own safety.
WARNING! This computer is a supplementary
device for properly trained free divers. The
information provided by this watch is FOR
REFERENCE ONLY and should never be used
as a primary source of information in planning
and/or executing sport dives.
WARNING! This computer, and the information
it provides, should in no case be considered a
substitute for certified freediving instruction or
training. Insufficient or improper training may
cause serious injury or death.
WARNING! This computer is solely intended to
provide secondary information for the free
diving activity. It should never be used for
scuba diving with tanks, or any other activity in
connection with commercial or professional
diving.
WARNING! Always use back-up instruments
such as a depth gauge, timer or watch.
If you have any questions about this manual, the above
warnings or the MISTRAL freediving computer, contact
your OMERSUB dealer before attempting to use this
computer inside or outside the water.
2.0 Button and its Function
[EL] [U] auto backlight
indicator
[M] [D]
DISPLAY
Current Time Mode Auto Backlight
Mode Button [M]
▪To select among the Current Time, Dive Recall, Chronograph,
Countdown Timer and Dual Time Mode.
▪Hold to enter Setting Mode
Up/Start/Stop Button [U]
▪To change the setting value or increase the set value
during Setting Mode.
▪To activate the 'start' or 'stop' function during Chronograph and
Countdown Timer Mode.
▪To change the sub-function display of Current Time Mode.
▪To select dive record in Dive Recall Mode.
Down/Reset Button [D]
▪To show the Daily Alarm.
▪To change the setting value or decrease the set value during
setting display.
▪To clear the value for the Chronograph and Countdown Timer.
▪To select dive record in Dive Recall Mode.
EL Button [EL]
▪Hold the [EL] button for 2 seconds to set the auto backlight
between ON and OFF.
▪To turn on the EL back light for about 3 seconds.
Auto Backlight
▪When Auto Backlight is set ON, the EL backlight will turn on for
3 seconds automatically when a key is pressed.
NOTE: The major key operations are summarized on the above
paragraphs, however please read the coming chapters for the detail
operations.

3.0 Major Function Modes

4.0 Current Time Mode - Sub-function Display and Daily Alarm
Current Time Sub-function Display
▪Press the [U] button will change the sub-function display
on the 1st and 3rd row in the Current time Mode
following the adjacent diagram:
▪The 1st row of display will show the Day of
week or the current temperature.
▪The 2nd row will be the current Time.
▪The 3rd row will show the Second or Date.
Daily Alarm Display
▪Press the [D] button will display the Alarm Time until the
[D] button is released.
NOTE: If [D] is pressed and hold for more than 2 seconds,
it will go into the Alarm Time setting display. Please refer to
the Chapter 4.2 for more details on Alarm Time setting.

4.1 Current Time Mode -The Setting Display
How to Set the Watch
▪To select the setting display, hold the [M] button for 2
seconds in the Current Time Mode, and then the
'Second' digits will start flashing.
▪In setting display, press the [M] button to move the
flashing following the adjacent diagram to select among
different settings.
▪During one of the settings (except second) is flashing,
press the [U] or [D] button to increase or decrease the
number / change the setting (hold down the button to
change it at a higher speed).
▪When the second digits start flashing, press the [U] or
[D] button to reset to zero.
▪When the ‘beep’ (Key tone) is set ON, there will be a
beep sound when a key is pressed.
▪If the 'chime' (Hourly Chime) is turned ON ( ) the
Watch will beep once every hour.
▪When the setting is completed, hold the [M] button for 2
seconds to exit the setting display. If there is NO key-
stroke for 1 minute, the Watch will also exit the setting
display automatically.
NOTE: Please check the Chapter 8.3 for more detail of
Dive Mode Settings.

4.2 Current Time Mode -Setting the Daily Alarm
How to Set the Daily Alarm
▪To select the Daily Alarm setting display, hold the [D]
button for 2 seconds in the Current Time Mode until the
'Minute’ digits start flashing.
▪In setting display, press the [M] button to move the
flashing following the adjacent diagram to select among
different settings.
▪When the digits of “minute” or “hour” is flashing, press
the [U] or [D] button to increase or decrease the number
(hold down the button to change the number at a higher
speed).
▪When ‘ON’ or ‘OFF’ is flashing, press the [U] or [D]
button to turn ON/OFF the daily alarm.
▪When the setting is completed, hold the [M] button for 2
seconds to exit the setting display. If there is NO key-
stroke for 1 minute, the Watch will also exit the setting
display automatically.
▪When the daily alarm is ON, the daily alarm indicator
will be appeared.

5.0 Chronograph Mode -Using the Chronograph
Chronograph Mode
▪This Watch includes a stopwatch function which
measures elapsed time and current split time.
▪The measuring capacity of the chronograph:
▪Measuring resolution: 1/100 second
▪Measuring range: 99 hours, 59 minutes and
59.99 seconds.
How to Use the Chronograph
▪When the Chronograph Display is selected, press the
[U] button to start the chronograph. Press [U] again to
Stop counting.
▪When the chronograph is running, press the [D] button
will freeze the counting display for user to take a split
time.
NOTE:When the [D] button is pressed, the chronograph is
still running.
▪Press the [D] button again to resume the running
display.
▪When the chronograph is stopped, hold the [D] button
will reset the counter to all zero.

6.0 Countdown Timer Mode -Countdown Timer Display
Countdown Timer Mode
▪The measuring resolution of the timer is 1 second, and
the target time of the timer can be set up to a maximum
of 99 hours, 59 minutes and 59 seconds.
▪Press [U] to start counting when timer is stopped or stop
the counting when the timer is running.
▪During counting, the Watch will beep for 30 seconds
when counts down to zero.
▪When the timer counts to zero, it will reload the initial
value of the target time automatically.
How to Reload the Timer
▪Press the [D] button to clear the timer and reload the
target time to initial value when the timer is stopped
counting.

6.1 Countdown Timer Mode -Setting the Countdown Timer
How to Set the Countdown Timer
▪To select the setting display, hold the [M] button for 2
seconds in the Countdown Timer Display, and then the
'Hour' digit will start flashing.
▪In setting display, press the [M] button to move the
flashing following the adjacent diagram to select among
different settings.
▪When the digits are flashing, press the [U] or [D] button
to increase or decrease the number (hold down the
button to change the number at a higher speed).
▪When the setting is completed, hold the [M] button for 2
seconds to exit the setting display. If there is NO key-
stroke for 1 minute, the Watch will also exit the setting
display automatically.

7.0 Dual Time Mode -Setting the Dual Time
Dual Time Mode
▪This Watch includes a Dual Time Mode which tells user
another time when they travel overseas.
How to Set the Dual Time
▪To select the setting display,hold the [M] button for 2
seconds in the Dual Time Display, and then the 'Minute'
digit will start flashing.
▪In setting display, press the [M] button to move the
flashing following the adjacent diagram to select among
different settings.
▪When ‘Hour’ or ‘Minute’ is flashing, press the[U] or [D]
button to increase or decrease the number (hold down
the button to change the number at a higher speed).
▪When the setting is completed, hold the [M] button for 2
seconds to exit the setting display. If there is NO key-
stroke for 1minute, the Watch will also exit the setting
display automatically.

8.0 Dive Mode -Precaution and Dive Mode
Dive Mode Precaution
▪If moisture is escalated around the water sensor, it may
activate the Dive Mode unintentionally. To prevent this
happen, dry the water sensor with a soft cloth when the
water sensor is wet.
▪If dirt is escalated around the water sensor, it may
obstruct the Watch to switch to Dive Mode automatically
when you are diving. To prevent this happen, clean the
water sensor with a soft cloth before starting a dive.
Dive Mode
▪The Dive Mode will be activated automatically if the user
submerges, and reaches the water level approximately
to 1.5 m (4.92 ft).
▪When the user emerges, and returns to the water level
approximately to 1.5 m (4.92 ft) or shallower, the
Surface Mode will be swiched on automatically (See 8.1
for detail).
▪When the Dive Mode appear, the following information
will be displayed:
1) the Current water depth,
2) the Current water temperature,
3) the Dive Status Indicator, and
4) the Elapsed Dive Time.
5) Current Time Display (Optional)
6) Maximum Depth
Depth Alarm
▪If the alarm is enabled and the depth is over the preset
value, the flashing MAX icon will be shown and a 30-
second-sound alert will be heard.

8.1 Dive Mode -Dive Status Indicator and Dive Site Selection
Surface Mode
▪When the user dive shallower than 1.5 meters, the
watch will switch to Surface mode automatically.
▪The surface time will start counting and will be shown on
display.
▪During Surface mode, the user can ceck the Max depyh
of last dive and Dive time of last dive by pressing [M].
▪When the user comes out of the wather the sensors are
no contact with wather for 30 seconds or the user holds
the [M] for 2 seconds, it will exit from the Surface Mode
automatically.
Note: The surface Mode can only be activated after the
user user returns from diving below wather level 1.5 m.
Sea and Lake dive
▪The watch can work either in sea water of lake water.
Set ‘Sea’ for sea water diving or ‘Lake’ for lake water
diving.
▪Ceck chapter 8.3 for more details on how to set the
diving site setting.

8.2 Dive Mode -Dive Record for a Single Dive and Subsequent Dives
Dive Records
Each Time user starts a dive for more than 10 seconds
(with at least 1.5m depth or deeper), the following
information will be stored as a record into the Watch:
1.The Elapsed Dive Time,
2.The Maximum Reached Watch Depth,
3.The Minium Water Temperature during dive,
4.The Starting Time and Date of the dive, and
5.Dive Site Information
▪User can store up to 199 dive records, and user can
recall these dive record(s) in a later day.
NOTE: Check the Chapter 9.0 for more detail of how to
recall dive record.

8.3 Dive Mode -Settings of Dive Mode
How to Set for the Dive Mode
▪Check for Chapter 4.1 of how to go into Setting Display.
▪In setting display, press the [M] button to bypass the
settings of current time until ‘ C’ or ‘ F’ is flashing .
▪During one of the settings is flashing (selected), press
the [U] or [D] button to change the setting.
How to Set Depth Alarm
▪This watch features depth alarm to remind the user
when he/she reaches the pre-set depth. Once it is
switched on and when the user dive deeper than the
pre-set depth, a flashing icon MAX will be shown with
alert sound for 30 seconds .
▪After the setting of th Dive site Type, the default depth
30 is flashing, press the [U] or [D] button to change the
setting and the [M] button to confirm. Press the [U] or [D]
button to switch on/off this function and the [M] button to
confirm.
▪When the setting is completed, hold the [M] button for 2
seconds to exit the setting display. If NO button is
pressed for 1 minute, the watch will exit the setting
display automatically.

9.0 Dive Recall Mode -Recalling the Dive Records
Dive Record Recall Mode
▪To select the Dive Record Recall Mode, press the [M]
button in the Current Time Mode.
▪User can store up to 199 dive records, and user can
select displaying those records by pressing the [U] or [D]
button.
▪When the number of the Dive records are over 199, the
oldest one well be overwritten automatically.
Dive Record Display
▪In the Recall Mode, the Watch will show the following
information alternatively:
Display 1:
1) Records Number
2) Starting Time
3) Starting Date
4) Dive Site indicator
Display 2:
5) Minium Water Temperature
6) Maximum Dive Depth
7) Elapsed Dive Time
How to Reset the records
▪Hold down the [M] button for 2 seconds to select
deleting the CURRENT record. Press [U] or [D] to select
YES or NO and hold [M] to confirm.
▪Hold down the [M] button for 4 seconds to select
deleting the PREVIOUS record. Press [U] or [D] to
select YES or NO and hold [M] to confirm.
▪Hold down the [M] button for 6 seconds to select
deleting ALL records. Press [U] or [D] to select YES or
NO and hold [M] to confirm.
In the ‘Del’ mode, if NO button is pressed for 1 minute, it
will return to the Dive Recall Mode display.

9.1 RESET
The RESET function can be used to delete any error
message or problems related to functioning of the SP1
software. To carry out this operation, access
"CURRENT TIME” mode, push [M] to access time
setting (the seconds flash), then press [U] and [D]
together and hold them down for about 5 seconds.
Initially a full line will appear accompanied by a “beep”
sound, followed by a message that reads “RTS N”.
Press the [U] or [D] buttons and the message on the
display will be “RTS Y”, now press [M] to confirm
resetting. The display will still show a complete
segment and the entire internal memory will be reset
completely, including the time. You can now continue
using the watch with all its functions reset.

10.0 Specification
Current Time Mode
▪Hour, Minute, Second display
▪Month, Date, Day of Week display
▪Auto Calendar from 2000 to 2099
▪12/24 hour format
▪Month/Date or Date/Month display
▪Hourly Chime
▪Daily Alarm
▪Temperature Display
Chronograph Mode
▪Resolution : 1/100 second
▪Range : 99 hours, 59 minutes, 59.99 seconds
▪Split Time function
Countdown Timer Mode
▪Resolution : 1 second
▪Range : 99 hours, 59 minutes, 59 seconds
▪Beep once per minute for last 10 minutes
▪Beep once per 10 seconds for last minute
▪Beep once per second for last 5 seconds
▪Beep for 30 seconds when countdown to zero
Dive Mode
▪Sea or Lake diving site selectable
▪Automatically activate/deactivate Dive Mode when
submerge or emerge to 1.5m of water depth.
▪Current Dive duration, Depth, Dive site, Current
Time, Maximum depth and Water temperature
display
▪Depth Unit : meter or feet selectable
▪Depth resolution : 0.1m / 0.328 ft
▪Maximum Depth : 100m / 328ft
▪Automatic Dive log memory
Temperature Display
▪Unit : °C / °F selectable
▪Resolution : 1°C / 1°F
▪Range : -10C to +60C / 14F to 140F
Dive Recall Mode
▪Maximum 199 records to be recorded and recall
▪Each dive record contains:
Record number
Starting Time and Date
Dive Duration
Maximum Dive Depth
Minimum Water Temperature
Dive Site Indication
▪Delete current/previous/all records function
11.0 Maintenance
▪Avoid exposing the watch to extreme conditions for an
unreasonable time, and avoid rough uses or sever
impacts.
▪The battery of the MISTRAL computer must be changed
exclusively by the authorised OMER dealer where it was
purchased or directly by OMERSUB Spa. If the battery
is changed by unauthorised personnel, any guarantee
valid for the product will immediately be considered null
and void.
▪Occasionally, clean the watch, particularly the water
sensor, on the back of the watch, with a soft cloth.
▪Never expose the watch to strong chemicals such as
gasoline and alcohol, as they will damage the watch.
▪Always rinse the watch with fresh water, after use, and
store it in a dry place.

1.0 Introduzione
Leggere attentamente il presente manuale d’istruzioni, assicurandosi di
comprendere appieno l’utilizzo e i limiti di questo strumento. L’utilizzo
improprio può causare danni gravi o la morte.
!AVVERTENZE IMPORTANTI!
ATTENZIONE! OMERSUB raccomanda di
seguire un adeguato corso di addestramento
certificato prima di effettuare le immersioni e la
pesca in apnea. La sicurezza personale dipende
unicamente da se stessi.
ATTENZIONE!Questo computer è uno
strumento supplementare destinato agli esperti
di immersioni in apnea. Le informazioni fornite
da questo orologio sono PURAMENTE
INDICATIVE e non vanno mai prese come fonte
principale d’informazioni per la pianificazione
e/o esecuzione di immersioni sportive.
ATTENZIONE!Questo computer e le relative
informazioni fornite non devono mai sostituire
le istruzioni o l’addestramento certificato in
materia di immersioni in apnea. Un allenamento
carente o non idoneo può causare danni gravi o
la morte.
ATTENZIONE!Questo computer ha il solo scopo
di fornire informazioni secondarie all’attività
d’immersione in apnea. Non deve mai essere
impiegato per immersioni con bombole, né per
qualsiasi altra attività legata alle immersioni
professionali o commerciali.
ATTENZIONE! Utilizzare sempre strumenti di
riserva, profondimetro, timer od orologio.
In caso di domande circa il presente manuale, le
avvertenze esposte sopra o il computer da apnea
MISTRAL contattare il proprio rivenditore OMERSUB
prima di impiegare il computer dentro o fuori dall’acqua.
2.0 Pulsanti e relative funzioni
[EL] [U] Indicatore di
retroilluminazione
automatica
[M] [D]
DISPLAY
Modalità ore attuale Retroilluminazione
Pulsante Modalità [M]
▪Per scegliere tra le modalità Ora attuale, Richiamo immersione,
Cronografo, Timer per conto alla rovescia e Doppio orario.
▪Tenere premuto per accedere alla modalità Impostazioni
Pulsante Su/Avvio/Stop[U]
▪Per modificare il valore o aumentare il valore impostato durante la
modalità Impostazioni.
▪Per at tivare la fun zione “a vvio” o “stop ” durante la m odalità
Cronografo e Timer per conto alla rovescia
▪Per modificare la visualizzazione della sottofunzione nella modalità
Ora attuale.
▪Per selezionare la registrazione nella modalità Richiamo
immersione.
Pulsante Giù/Reset [D]
▪Per m ostrare l’allarme gio rnaliero.
▪Per modificare il valore o diminuire il valore impostato durante la
modalità Impostazioni.
▪Per cancellare il valore del Cronografo o del Timer per conto alla
rovescia.
▪Per selezionare la registrazione nella modalità Richiamo
immersione.
Pulsante EL[EL]
▪Tenere premuto il pulsante [EL] per 2 secondi per impostare la
retroilluminazione automatica su ON o OFF.
▪Per accendere la retroilluminazione per circa 3 secondi.
Retroilluminazione automatica
▪Se è impostata la Retroilluminazione automatica essa si accende
per 3 secondi quando si preme un tasto
NOTA: I paragrafi precedenti riassumono le operazioni principali;
tuttavia leggere i capitoli seguenti per i relativi dettagli.

3.0 Modalità di funzionamento principali

4.0 Modalità Ora attuale –Sottofunzioni e allarme giornaliero
Visualizzazione delle sottofunzioni dell’Ora attuale
▪Premendo il pulsante [U] le sottofunzioni della 1ae
3ariga della modalità Ora attuale cambiano in base
al diagramma posto a lato:
▪La 1ariga mostrerà il giorno della settimana o
la temperatura attuale.
▪La 2ariga mostrerà l’ora attuale.
▪La 3ariga mostrerà i secondi o la data.
Visualizzazione dell’allarme giornaliero
▪Premendo il pulsante [D] viene mostrata l’ora
dell’allarme finché non si rilascia il pulsante.
NOTA: Se si tiene premuto [D] per oltre 2 secondi si
entra nella modalità d’impostazione dell’allarme. Per
ulteriori dettagli sull’impostazione dell’allarme
consultare il capitolo 4.2.

4.1 Modalità Ora attuale –Display d’impostazione
Come impostare l’orologio
▪Per selezionare il display d’impostazione tenere
premuto il pulsante [M] per 2 secondi nella
modalità Ora attuale: la cifra dei secondi inizierà a
lampeggiare.
▪Nel display d’impostazione premere il pulsante [M]
per spostarsi secondo il diagramma posto a lato e
scegliere le diverse impostazioni.
▪Mentre un’impostazione (eccetto i secondi) sta
lampeggiando premere il pulsante [U] o [D] per
aumentare o diminuire il numero / modificare
l’impostazione (tenere premuto il pulsante per
aumentare la velocità di modifica).
▪Quando le cifre dei secondi iniziano a lampeggiare
premere il pulsante [U] o [D] per azzerare.
▪Se è impostato il segnale acustico verrà emesso
un suono quando si preme un tasto.
▪Se è impostato il campanello ( ) l’orologio
emetterà un suono ogni ora.
▪Completata l’impostazione, t enere premuto il
pulsante[M] per 2 secondi per uscire dal display
d’impost azione. Se NON viene premuto alcun
tasto per 1 minuto l’orologio abbandonerà
automaticamente il display d’impostazione.
NOTA: Per ulteriori dettagli sulle impostazioni della
modalità Immersione consultare il capitolo 8.3.