Citizen C70 User manual

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Please refer to the diagram on the left when reading this instruction
manual.
Veuillez vous reporter au schéma de gauche pendant la lecture des
explications de ce mode d'emploi.
Consulte con el diagrama de la izquierda cuando lea este manual de
instrucciones.
Bitte beziehen Sie sich bei der Verwendung dieser Anleitung auf das
nebenstehende Diagramm.
Fare riferimento all’illustrazione a sinistra durante la lettura delle
istruzioni per l’uso.
Na leitura deste Manual de Instrução, favor referir-se ao diagrama
descrito à esquerda.
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1
English
This watch is a combination quartz watch, with a race timer function for various
races such as yacht racing, etc., chronograph function, and timer function.
It also has a thermometer function and an EL (electroluminescence) light
function.

2 3
CONTENTS
1. NAME OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. SETTING THE HANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3. CHANGING DIGITAL FUNCTIONS (MODES) . . . . . . . . . . . . . . . . . . . . .8
4. USING EACH FUNCTION (MODE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
A. Time mode <TME> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
B. Calendar mode <CAL> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
C. Alarm 1 & 2 modes <AL-1, AL-2> . . . . . . . . . . . . . . . . . . . . . . . . . . .14
D. Chronograph mode <CHR> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
E. Race timer mode <RACE> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
F. Timer mode <TMR> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5. USING THE THERMOMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6. LOW BATTERY INDICATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
7. ALL RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
8. USING THE BEZEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
9. PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
10. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

54
Mode Time Calendar Alarm 1
Name Press once Switching ON/OFF
Button APress for more EL light ON
than 2 seconds Alarm monitor
Press once Thermometry Thermometry
Button BPress for more To time adjustment To calendar To alarm
than 2 seconds mode adjustment mode adjustment mode
Button MPress once To <CAL> mode To <AL-1> mode To <AL-2> mode
1: Mode mark display TME CAL AL-1
2: Digital display [1] Hours, Minutes, Month, Date, Set time, ON/OFF
Seconds Day of the week
3: Digital display [2] Temperature Temperature Temperature
1. NAME OF PARTS
Alarm 2 Chronograph Race Timer Timer
Switching ON/OFF Start/Stop Start/Stop Start/Stop
Alarm monitor
Split/Reset Set time adjustment Set time adjustment
To alarm Quick set time Quick set time
adjustment mode adjustment adjustment
To <CHR> mode To <RACE> mode To <TMR> mode To <TME> mode
AL-2 CHR RACE TMR
Set time, ON/OFF Hours, Minutes, Minutes, Seconds, Minutes, Seconds,
Seconds Set time Set time
Temperature 1/1000 second Temperature Temperature

(1)Pull the crown out to stop the second
hand.
(2)Turn the crown to set the correct time.
(3)Press the crown back in to restart.
76
4: Graphic display Always indicates graphic, syncronized with digital display 1
5: Crown Used for setting analog
6: Hour hand Always indicates time (hours)
7: Minute hand Always indicates time (minutes)
8: Second hand Always indicates time (seconds)
9: Thermosensor Senses current temperature,
shown by digital display 2
2. SETTING THE HANDS
Second hand
Setting position
Analog and digital time can be set individually as a dual-time watch.

98
Besides the time function, this watch has six other functions. Calendar, alarm 1,
alarm 2, chronograph, race timer and timer.
The current mode can be checked by the mode mark. Each time button Mis
pressed, the watch mode changes in the following sequence.
<Automatic return function>
When the watch is left in alarm 1 or alarm 2 mode for more than 2 minutes, it
automatically returns to time mode.
3. CHANGING DIGITAL FUNCTIONS (MODES)
A. Time mode <TME>
When button Ais pressed or being pressed in time mode, the EL light is turned
on.
When button Bis pressed, the current temperature is recalculated.
4. USING EACH FUNCTION (MODE)
MODE
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Mode mark
M
MODE
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SUM.
Temperature
Hours,
Minutes Seconds
Summer time
ON mark
M
BA
Mode mark Mode (function)
TME Time
CAL Calendar
AL-1 Alarm 1
AL-2 Alarm 2
CHR Chronograph
RACE Race timer
TMR Timer
<Switching to summer time (daylight
saving time)>
(1)Press button Bin time mode for
more than 2 seconds. The “SUM.”
and “ON/OF” starts blinking to
indicate that the watch enters time
setting mode.
(2)Press button Ato set summer time
on or off.
Each time button Ais pressed, the
summer time setting mode is
switched on (ON) or off (OF)
alternately.
(3)Press button Mto return the watch
to normal time display.
[Normal time display]

11
*When watch is set to the summer time (ON).
The “SUM.” appears and the watch indicates time that is one hour ahead of
standard time.
<Setting digital time>
(1)Press button Bin normal time mode for more than 2 seconds. The “SUM.”
and “ ON/OF ” starts blinking to indicate that the watch enters time setting
mode.
(2)Each time button Bis pressed in time setting mode, the blinking figures
change from the “SUM.” to “seconds”, “minutes”, “hours”, “12-hour/24-hour”,
and to “SUM.” again. Use button Bto select the figures you want to change.
(3)Adjust the blinking figures by pressing button A. (If button Ais pressed
continuously, the figures change quickly.)
•The summer time display is switched ON/OF each time button Ais pressed.
•For resetting seconds, press button Ato restart from “00” second.
•The “12-hour/24-hour” indication system is switched alternately each time
button Ais pressed.
(4)Press button Mto return the watch to normal time display.
10
•When setting time in 12-hour indication system, make sure it is correctly set
for the morning (A) or the afternoon (P).
•If the watch is left in time setting mode (figures blinking) for more than 2
minutes, it returns to normal time display automatically.
•If button Mis pressed in time setting mode, the watch returns to normal time
display.

13
B. Calendar mode <CAL>
When button Ais pressed or being pressed in calendar mode, the EL light is
turned on.
When button Bis pressed, the current temperature is recalculated.
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MODE
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[Normal calendar display]
Month, Date Day of the week
Temperature
<Setting calendar>
(1)Press button Bin calendar mode for more than
2 seconds. The “Month” starts blinking to
indicate that the watch enters calendar setting
mode.
(2)Press button Bto select the setting “Month”,
“Date” or “Year”. Blinking figures move in order
from “Month” to “Date”, to “Year”.
(3)Press button Ato adjust the blinking figures. (If
button Ais pressed continuously, the figures
changes quickly.)
(4)Press button Mto return the watch to normal
calendar display.
•The Year (in the Christian era) can be set between 1998 and 2099. (Year
display appears in calendar setting mode only.)
•If the watch is left in calendar setting mode (figures blinking) for more than 2
minutes, the watch returns to normal calendar display automatically.
•The correct day of the week is automatically set as a result of setting the year,
month and date.
•If the date is set to a non-existing date (for example, February 30), the watch
automatically displays the first day of the next month when it returns to normal
calendar display.
•This watch need not to set for the 1st day of every month due to the automatic
calendar function.
•If button Mis pressed in calendar setting mode, the watch returns to normal
calendar display.

1514
C. Alarm 1 & 2 modes <AL-1, AL-2>
The only difference between alarm 1 and alarm 2 is the sound. The two modes
are the same in use and setting manner. When either alarm is set (ON) once, it
sounds for 20 seconds at the same time every day.
<Switching alarm ON/OFF>
Each time button Ais pressed while in normal alarm display, the alarm is
switched ON/OF(off) alternately.
(“ON”: alarm is on, “OF”: alarm is off.)
< Alarm sound duration, Stopping alarm>
The Alarm sound duration is 20 seconds. Alarm sound stops by pressing any
button.
<Monitoring sound>
While button Ais being pressed in alarm mode, the alarm continues to sound.
MODE
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[Normal alarm display (ON)]
Alarm time
(hours, minutes) ON or OF (off)
Temperature
<Setting alarms>
(1)Press button Bin alarm mode for more than
2 seconds. The “Hours” starts blinking to
indicate that the watch enters alarm setting
mode. The blinking figures can be adjusted.
(2)Press button Ato adjust “Hours”.
(3)While the “Hours” is blinking, press button B
to start the “Minutes” blinking.
(4)Press button Ato adjust “Minutes”.
(Pressing button Acontinuously changes
the figures quickly.)
(5)Press button Mto return the watch to normal
alarm display.
AA
A

1716
•When time mode is in 12-hour system, the alarm mode is in the same system.
Be aware of A/P indication whether it is set for morning (A) or afternoon (P).
•If time mode is set for summer time, it does not affect the alarm mode.
•If the watch is left in alarm setting mode for more than 2 minutes, it
automatically returns to normal alarm display.
•If button Mis pressed in alarm setting mode, the watch returns to normal
alarm display.
D. Chronograph mode <CHR>
The chronograph is capable of measuring and indicating a maximum of 23
hours, 59 minutes, 59 seconds and 999 milliseconds in increments of 1/1000
second. After 24 hours, it stops with a reset display of “00°00'00"000”. The
chronograph can also measure split time (elapsed time).
MODE
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：
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[Chronograph reset display]
Measured time
(milliseconds)
Measured time (hours, minutes, seconds)

1918
<Changing the mode during time measurement in chronograph mode>
Even if button Mis pressed during a time measurement in chronograph mode
and mode is changed, time measurement is continued internally. The measured
time is shown when the mode is returned to chronograph again. However, if the
time measurement is continued for more than 24 hours, the chronograph stops
at the reset state.
* Confirmation sound and EL light
At the time of start, stop, split time check or reset operation in chronograph
mode, a confirmation sound is heard.
At the time of stop or a split time measurement, the EL light is turned on for 3
seconds with the sound.
Split time: Elapsed time from start point
<Total elapsed time measurment>
(1)The chronograph starts or stops each time button Ais pressed.
(2)To reset the chronograph, press button Bafter it is stopped.
<Split time measurment>
(1)The chronograph starts or stops each time button Ais pressed.
(2)Press button Bduring a time measurement, and the watch shows a split
time for 10 seconds. While a split time is shown, “SPLIT” will blink.
Each time button Bis pressed, the chronograph shows the latest split time.
(3)To reset chronograph, press button Bafter it is stopped.
Reset
*1
Stop
Measurement
Split time
Split time
Split time
Start point Goal
*1: Automatically returns
to measurement mode
after 10 seconds.
B
B
B
AA

21
E. Race timer mode <RACE>
Race timer mode has an automatic chronograph function that starts time
measurement when set time is up. The timer can be set in 15 ways; for 1, 3, 5 or
6 minutes, and for 10 to 60 minutes in increments of 5 minutes. Set the timer
according to the race.
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MODE
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Temperature
Remaining time
(minutes, seconds) Set time (minutes)
M
BA
<Setting race timer>
Press button Bin race timer setting
display to select a set time (set time
blinks). Each time button Bis pressed,
the set time changes from 60, 55, 50,
...5, 3, 1 (minutes). (If button Bis
pressed continuously, the set time
changes quickly.)
[Race timer setting display]
<Race timer countdown>
(1)
Press button Ain race timer setting display and the race timer starts counting
down.
(2)If button Ais pressed during the countdown, the race timer stops. If button
Ais pressed again, the race timer restarts the countdown.
(3)If button Bis pressed after the race timer is stopped, the set time of the race
timer is shown.
(4)When the countdown of the set time is complete, the automatic chronograph
starts while a time-up signal is sounding for 5 seconds.
*1 *2
Stop
Set time Race timer
countdown Time-up of
race timer
Stop
Automatic
chronograph
measurement
*Note
B
B
B
B
A
AA

2322
* Note
After race timer is switched to the automatic chronograph display, the race timer
repeats the countdown internally according to the set time.
If button Bis pressed in automatic chronograph display to change to the race
timer display, the race timer indicates the remaining time (in the countdown) that
has repeatedly been checked internally. (However, if the automatic chronograph
is stopped halfway, the timer that internally continues checking time will not
stop.)
Example: When the race timer is set for 5 minutes.
The race timer repeats for 5 minutes while the automatic chronograph is in time
measurement. If button Bis pressed 3 minutes after the automatic chronograph
display, 2 minutes is indicated as the remaining time of the race timer.
• Time-up warning sound
A time-up warning sound is heard when the remaining time is 10, 5, 3 minutes,
1 minute, 50 seconds, 40, 30, 20, 10, 5, 4, 3, 2 seconds and 1 second before
the set time is up.
*1: Race timer restart function (flyback function)
If button Bis pressed during the countdown, the race timer returns to the set
time and restarts.
*2: Automatic chronograph start function
When the set time of the race timer is up, the automatic chronograph starts.
<Automatic chronograph measurement>
The automatic chronograph starts time measurement the instant the race timer
time is up. The maximum time is 23 hours, 59 minutes, 59 seconds in
increments of 1 second. After 24 hours, it returns to race timer set time.
(1)
Each time button Ais pressed while the automatic chronograph is in the time
measurement display , the automatic chronograph alternately stops and
restarts.
(2)If button Bis pressed while the automatic chronograph is in the time
measurement display, the display returns to race timer countdown.
(3)If button Bis pressed when the automatic chronograph is stopped, and the
display returns to the race timer set time.

2524
• Confirmation sound
At the time of start, stop, reset or restart operation in race timer or automatic
chronograph mode, a confirmation sound is heard.
<Changing modes during race timer countdown>
If button Mis pressed in race timer or automatic chronograph display, the time
measurement is continued internally. If the mode is moved to race timer again,
the time that is continuously measured by the race timer is indicated. However, if
automatic chronograph continues for more than 24 hours, the display is returned
to the set time of the race timer.
F. Timer mode <TMR>
The timer can be set for 1 minute to 60 minutes in increments of 1 minute. When
the set time is up, a time-up warning sound is heard for about 5 seconds. After
that, the timer returns to set time and stops.
MODE
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TEMP
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Temperature
Remaining time
(minutes, seconds) Set time (minutes)
M
BA
<Setting timer>
Press button Bin timer setting display
(set time is blinking) to change the set
time. Each time button Bis pressed,
the indicated set time decreases by
1 minute. (If button Bis pressed
continuously, the indicated value
decreases quickly.)
[Timer setting display]

2726
<Timer countdown>
(1)Press button Ato start the timer at the set time.
(2)If button Ais pressed during timer countdown, the timer stops. If button Ais
pressed again, the timer restarts.
(3)If button Bis pressed when the timer stops, the display returns to the timer
set time.
• Confirmation sound
At the time of start, stop, reset or timer restart operation in timer mode, a
confirmation sound is heard.
<Changing modes during timer countdown>
If button Mis pressed in timer mode to change the mode, the time countdown is
continued internally. If the mode is changed again to timer mode, the time
continuously counted down by the timer is displayed. However, if the timer time
is up, the display returns to timer set time.
*1
Stop
Set time
Time up Countdown
Automatically returns to the set time.
B
B
A
A
*1: Timer restart function
If button Bis pressed during timer countdown, the mode immediately changes
to timer set time display and restarts.

5. USING THE THERMOMETER
The thermometer indicates the current or last measured temperature in all
modes except the chronograph mode.
Temperature is measured in two ways:
1. By button operation at any time
2. Automatically measured every hour, on the hour
Temperature can be indicated either in centigrade (°C) or on Fahrenheit (°F).
<Automatic temperature measurement>
Temperature is automatically measured every hour, on the hour and when the
mode changes from chronograph to race timer.
However, if the watch is in the setting status (blinking indication) in time mode or
chronograph mode at the moment of measurement, no temperature is
measured.
<Temperature measurement by button operation>
If button Bis pressed in the normal time mode or calendar mode, temperature
is repeatedly measured for 3 minutes at intervals of 2 seconds.
2928
<Temperature measurement range and accuracy>
(Note)
•If the watch is worn on the wrist durning temperature measurement, the body
temperature affects measurement.
For accurate temperature measurement, take the watch off and leave it in the
measuring environment at least for 20 to 30 minutes. The influence of body
temperature depends on environmental conditions such as difference between
atmospheric temperature and body temperature before taking the watch off,
etc.
In Centigrade (°C) On Fahrenheit scale (°F)
Temperature display range –9.9°C K+59.9°C 14°F K139°F
Measurement unit 0.1°C 1°F
Measurement accuracy 20°C K30°C: ±1°C 68°F K86°F: ±2°F
–5°C K+40°C: ±2°C 23°F K104°F: ±4°F

3130
Even when the watch falls into such
condition, it still displays the time but the EL
light, thermometer and alarm will not
function. Immediately replace the battery
with new one.
6. LOW BATTERY INDICATOR
When the battery gets weak, the low battery indicator function appears in digital
display 2 as shown below.
•The second hand moves at 2-second intervals (moves by 2 increments every
2 seconds).
•In time or calendar mode, the temperature display starts to blinking “- - -”.
•Do not use the thermometer out of the display range. Extremely hot or cold
temperature may cause breakdown of the watch.
<Switching temperature display between centigrade and Fahrenheit>
Press button Ain time or calendar mode for more than 3 seconds while
pressing button M. The temperature display changes from centigrade (°C) to
Fahrenheit (°F) or vice versa.
If button Ais pressed before button M, display does not change.
TEMP
C
TEMP
F
M + A
[Centigrade display] [Fahrenheit display]
Blinking
2 seconds

3332
7. ALL RESET
After replacement of the battery, be sure to perform the all reset operation as
shown below.
If the watch malfunctions or shows an abnormal display as a result of an
excessive shock or static electricity (for example, the watch indicates nothing,
continuously sounds alarm, etc.). Perform the all reset operation.
MODE
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A
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-
1
C
A
L
F
C
A
PSUM.
SPLIT
Crown
M
BA
(1)Pull the crown out.
(2)Simultaneously press buttons A, Band
M.
(3)Release the three buttons.
(4)Press the crown back. (A confirmation
sound is heard.)
All reset operation is complete.
Before use, reset the watch for the correct
time in all modes.
<Finding compass direction>
Point the hour hand in the direction of the
sun. The midpoint between the hour hand
and the 12 hours mark is roughly equal to
south. Point the “S” mark in the south
direction and you can read the approximate
directions of the compass. Use this
indication just as a guideline because the
indication changes slightly depending on
the season and latitude.
8. USING THE BEZEL
Some watches do not have the following bezel functions because of differences
in type or design.
1. Compass function
2. Yachting function
1. Compass function (in the northern hemisphere)
Compass direction can be approximated by this function, based on the direction
of the sun.
S
12 hours
South

3534
<Background knowledge>
In general yacht racing, such markings as
shown in the figure are set in the course.
Yachtsmen compete in how fast they can sail
the course in the specified order. Sailing
directions are specified by angles such as
north = 0°, east = 90°, south = 180°, west =
270°.
Sailing with the wind coming from the right
side is called starboard, sailing with wind from
the left side is called port.
STARBOARD
REACH
PORT
REACH

RUNNING
WINDWARDLEG
2. Yachting function
Wind Windward mark
Start line
Leeward mark
Side mark
<Using bezel-1>
(1)Before setting sail, find the windward mark by the compass and set the “\”
mark of the 12-hours point in the direction.
(2)The course toward the side mark from the windward mark (starboard reach)
is in the direction of the green “\” mark located in the lower left side.
Therefore, sail in this direction so that the yacht reaches the side mark even
when the mark is hard to find because of bad weather.
(3)In the same manner as (2), sail in the direction indicated by the red “\” mark
in order to sail on the course from the side marking to the leeward mark (port
reach).
(4)For sailing from the right side marking to the left, sail the yacht in the
direction of the white “\” mark.
Note: The above-mentioned method is effective only when θis set at 45°. If the
θis 60° and the side mark projects sidewards, read the numbers above
the green and red markings, otherwise the right course cannot be found.
In case θis 30° and the side mark is inside, read the numbers under the
red and green \markings.

37
* Making full use of the three functions enables you to sail in the most favorable
course.
36
<Using bezel-2>
The yacht can sail in the windward direction
at an angle of 45° (high performance yacht
can sail 40°). If the yacht is sailed in the
windward direction before race and the
obtained angle at the red or green mark
(upper right or upper left) is set, the wind
shift can be read during the race.
Therefore, the yacht can be sailed in the
most favorable direction.
(Porttack)(Starboardtack)
40゜−45゜ 40゜−45゜


Wind <Using bezel-3>
The bezel can be used to find the angle of the
start line to the wind direction. The start line is
generally set to the wind at an angle of 90°.
However, it seldom is the real right angle
because the wind direction changes frequently.
Therefore, set the white \mark in the wind
direction and sail in the direction from one end to
the other. If the sailing direction is in positive side
of the white line of the 3-hours (or 9-hours) point,
it is advantageous to set sail close to the current
direction. If the current direction is in negative
side of the white line, it is advantageous to take a
course opposite to the mark.
Direction of wind