Casio G-Shock GWM850-1 manual

Casio G-Shock GWM850-1
  • Number of pages: 8
  • Filetype: PDF

Operation Guide 3155

Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to read this manual carefully.
Keep the watch exposed to bright light
The electricity generated by the solar cell of the watch is
stored by a built-in battery. Leaving or using the watch
where it is not exposed to light causes the battery to run
down. Make sure the watch is exposed to light as much as
When you are not wearing the watch on your wrist,
position the face so it is pointed at a source of bright
You should try to keep the watch outside of your sleeve
as much as possible. Charging is reduced significantly if
the face is only partially covered.
Bright Light
Solar cell
The watch continues to operate, even when it is not exposed to light. Leaving the
watch in the dark can cause the battery to run down, which will result in some watch
functions to be disabled. If the battery goes dead, you will have to re-configure watch
settings after recharging. To ensure normal watch operation, be sure to keep it
exposed to light as much as possible.
Rechargeable battery
Bright Light
Solar cell
(Converts light to
electrical power.)
Some or all
Battery charges in the light.
Battery discharges in the dark.
The actual level at which some functions are disabled depends on the watch model.
Frequent display illumination can run down the battery quickly and require charging.
The following guidelines give an idea of the charging time required to recover from a
single illumination operation.
Approximately 5 minutes exposure to bright sunlight coming in through a window
Approximately about 8 hours exposure to indoor fluorescent lighting
Be sure to read “Power Supply” for important information you need to know
when exposing the watch to bright light.
If the display of the watch is blank...
If the display of the watch is blank, it means that the watch’s Power Saving function
has turned off the display to conserve power.
See “Power Saving Function” for more information.
Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any
damage or loss suffered by you or any third party arising through the use of this
product or its malfunction.
About This Manual
Depending on the model of your watch, display text appears either as dark figures
on a light background or light figures on a dark background. All sample displays in
this manual are shown using dark figures on a light background.
Button operations are indicated using the letters shown in the illustration.
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.
General Guide
Press C to change from mode to mode.
In any mode (except when a setting screen is on the display), press L to illuminate
the display.
Timekeeping Mode
Press C.
Countdown Timer
Stopwatch Mode Alarm Mode
Rally Mode Recall Mode
World Time Mode
Radio-controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly.
This watch is designed to pick up the time calibration signals transmitted in Germany
(Mainflingen), England (Anthorn), the United States (Fort Collins), China
(Shangqiu), and Japan (Fukushima, Fukuoka/Saga).
Current Time Setting
This watch adjusts its time setting automatically in accordance with a time calibration
signal. You also can perform a manual procedure to set the time and date, when
The first thing you should do after purchasing this watch is to specify your
Home City (the city where you normally will use the watch). For more
information, see “To specify your Home City” below.
When using the watch outside the areas covered by the time signal transmitters, you
will have to adjust the current time setting manually as required. See “Timekeeping”
for more information about manual time settings.
The U.S. time calibration signal can be picked up by the watch while in North
America. The term “North America” in this manual refers to the area that consists of
Canada, the continental United States, and Mexico.
To specify your Home City
1. In the Timekeeping Mode, hold down A until the city
code starts to flash, which indicates the setting screen.
2. Press D (east) and B (west) to select the city code
you want to use as your Home City.
LIS, LON : Lisbon, London
MAD, PAR , ROM, BER, STO : Madrid, Paris,
Rome, Berlin, Stockholm
ATH : Athens
MOW : Moscow
HKG, BJS, TPE : Hong Kong, Beijing, Taipei
SEL, TYO : Seoul, Tokyo
HNL : Honolulu
ANC : Anchorage
City code
Hour : Minutes
PM indicator Seconds
YVR, LAX : Vancouver, Los Angeles
YEA, DEN: Edmonton, Denver
MEX, CHI : Mexico City, Chicago
MIA, YTO, NYC : Miami, Toronto, New York
YHZ : Halifax
YYT : St.Johns
3. Press A to exit the setting screen.
Normally, your watch should show the correct time as soon as you select your Home
City code. If it does not, it should adjust automatically after the next auto receive
operation (in the middle of the night). You also can perform manual receive or you
can set the time manually.
The watch will receive the time calibration signal automatically from the applicable
transmitter (in the middle of the night) and update its settings accordingly. For
information about the relationship between city codes and transmitters, see “Time
Calibration Signal Reception” and “Transmitters”.
See the maps under “Approximate Reception Ranges” for information about the
reception ranges of the watch.
You can disable time signal reception, if you want. See “To turn auto receive on and
off” for more information.
Under factory default settings, auto receive is turned off for all of the following city
codes: MOW (Moscow), HNL (Honolulu), and ANC (Anchorage). For details about
turning on auto receive for these city codes, see “To turn auto receive on and off”.
Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.
Auto Receive
With auto receive, the watch receives the time calibration signal automatically up to 6
times a day (5 times a day for the Chinese calibration signal). When any auto receive
is successful, the remaining auto receive operations are not performed. For more
information, see “About Auto Receive”.
Manual Receive
Manual receive lets you start a time calibration receive operation with the press of a
button. For more information, see “To perform manual receive”.
When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 12 o’clock side facing towards a window.
This watch is designed to receive a time calibration signal late at night. Because of
this, you should place the watch near a window as shown in the illustration when you
take it off at night. Make sure there are no metal objects nearby.
12 o’clock
Make sure the watch is facing the right way.
Proper signal reception can be difficult or even impossible under the conditions listed
Inside or
Inside a
Near a
site, airport, or
other sources of
electrical noise
Near high-
power lines
Among or
Near household
appliances, office
or a mobile
Casio G-Shock GWM850-1

Need help?

Number of questions: 1

Do you have a question about the Casio G-Shock GWM850-1 or do you need help? Ask your question here. Provide a clear and comprehensive description of the issue and your question. The more detail you provide for your issue and question, the easier it will be for other Casio G-Shock GWM850-1 owners to properly answer your question.

Paul Greenwald, 11-1-2015 22:30:39 1 comment

my watch just starting displaying time in 24 hr mode. I want 12 hr mode. Please help.

Mark, 24-12-2020 22:07:49

How do I clear the stopwatch

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View the manual for the Casio G-Shock GWM850-1 here, for free. This manual comes under the category Watches and has been rated by 1 people with an average of a 8.3. This manual is available in the following languages: English. Do you have a question about the Casio G-Shock GWM850-1 or do you need help? Ask your question here

Casio G-Shock GWM850-1 specifications

Brand Casio
Model G-Shock GWM850-1
Product Watch
EAN 79767899653, 797678996536
Language English
Filetype PDF
Technical details
World time function
Alarm function
Accuracy +/- 30 sec/month
Snooze function
Clock mode 12h/24h
Water resistant depth 200 m
Solar power
Battery type CTL1616
Battery level indicator
Battery life 0.5833 year(s)
Number of batteries supported 1
Band material Resin
Other features
Product colour Black
Dimensions (WxDxH) 51.5 x 42.5 x 13.9 mm
Weight & dimensions
Weight 56 g
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