Casio AQW100-1AV User Manual

1

Digital Time Daylight Saving Time (DST) Setting
Daylight Saving Time (summer time) advances the digital time setting by one hour
from Standard Time. Remember that not all countries or even local areas use Daylight
Saving Time.

1. In the Timekeeping Mode, hold down A until the seconds

start to flash, which indicates the setting screen.

2. Press C once to display the DST setting screen.
3. Press D to toggle between Daylight Saving Time (

ON

displayed) and Standard Time (

OF

 displayed).

4. Press A twice to exit the setting screen.

• The DST indicator appears on the Timekeeping, Moon/

Tide Data, Alarm, and Hand Setting Mode screens to
indicate that Daylight Saving Time is turned on. In the
case of the Moon/Tide Data Mode, the DST indicator
appears on the tide data screen only.

Seconds

DST

Hour

Minutes

Day

Month

Year

3. When the setting you want to change is flashing, use B and D to change it as

described below.

This watch features separate digital and analog
timekeeping. The procedures for setting the digital time
and analog time are different.

• The Moon phase indicator shows the current Moon

phase in accordance with the current date as kept in the
Timekeeping Mode.

• The tide graph shows tidal movements for the current

date in accordance with the current time as kept in the
Timekeeping Mode.

• Be sure to configure the current time and date, and your

Home Site data (data for the site where you use the
watch) correctly before using the functions of this watch.
See “Home Site Data” for more information.

Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to read this manual carefully and keep it on hand for later reference
when necessary.

• The longitude, lunitidal interval, Moon phase indicator and tide graph data that

appear on the display of this watch are not intended for navigation purposes.
Always use proper instruments and resources to obtain data for navigation
purposes.

• This watch is not an instrument for calculating low tide and high tide times. The

tide graph of this watch is intended to provide a reasonable approximation of
tidal movements only.

• CASIO COMPUTER CO., LTD. assumes no responsibility for any loss, or any

claims by third parties that may arise through the use of this watch.

• Button operations are indicated using the letters shown

in the illustration.

• For the sake of simplicity, the sample displays in this

manual do not show the analog hands of the watch.

• Each section of this manual provides you with the

information you need to perform operations in each
mode. Further details and technical information can be
found in the “Reference” section.

MA0804-EA

Press     .

• Press C to change from mode to mode.

• In any mode (except when a setting screen is on the display), press B to illuminate

the face of the watch.

Digital Time and Date
Use the Timekeeping Mode to set and view a digital display of the current time and date.
When setting the digital time, you can also configure settings for summer time
(Daylight Saving Time or DST).

1. In the Timekeeping Mode, hold down A until the

seconds start to flash, which indicates the setting
screen.

2. Press C to move the flashing in the sequence shown

below to select the other settings.

36

10:08

2008

6-30

Reset the seconds to 

00

Toggle between Daylight Saving Time (

ON

) and

Standard Time (

OF

)

Change the hour or minutes

Change the year

Change the month or day

Press D.

Press D.

Use D (+) and B (–).

4. Press A twice to exit the setting screen.

• The first press of A displays the UTC differential setting screen. Pressing A again

exits the setting screen.

• Resetting the seconds only (without changing the DST, hour, or minute setting)

causes the analog minute hand setting to be adjusted automatically.

• See “Digital Time Daylight Saving Time (DST) Setting” below for details about the

DST setting.

• The day of the week is displayed automatically in accordance with the date (year,

month, and day) settings.

Home Site Data
Moon phase, tide graph data, and Moon/Tide Data Mode data will not be displayed
properly unless Home Site data (UTC differential, longitude, and lunitidal interval) is
configured correctly.

• The UTC differential is a value that indicates the time difference between a

reference point in Greenwich, England and the time zone where a city is located.

• The letters “UTC” is the abbreviation for “Coordinated Universal Time”, which is the

world-wide scientific standard of timekeeping. It is based upon carefully maintained
atomic (cesium) clocks that keep time accurately to within microseconds. Leap
seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s
rotation.

• The lunitidal interval is the time elapsing between the Moon’s transit over a meridian

and the next high tide at that meridian. See “Lunitidal Interval” for more information.

• This watch displays lunitidal intervals in terms of hours and minutes.

• The “Site/Lunitidal Interval Data List” at the back of this manual provides UTC

differential and longitude information around the world.

• The following is the initial factory default Home Site data (Tokyo, Japan) when you

first purchase the watch, and whenever you have the batteries replaced. Change
these settings to match the area where you normally use the watch.
UTC differential (+9.0); Longitude (East 140 degrees); Lunitidal interval (5 hours,
20 minutes)

1. In the Timekeeping Mode, hold down A until the

seconds start to flash, which indicates the setting
screen.

2. Press A again to display the UTC differential setting

screen.

3. Press C to move the flashing in the sequence shown

below to select other settings.

UTC 

Differential

Longitude

Value

East Longitude/
West Longitude

Lunitidal Interval 

Hours 

Lunitidal Interval

Minutes