Casio G-Shock Master of G-Land MUDMASTER - GWGB1000EC1A

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Whatever you’re doing, wherever you are — the G-SHOCK Master 
of G line has your back. 
Based on GRAVITYMASTER, MUDMASTER, and MUDMAN models 
that deliver peak performance in punishing conditions 
in the air and on land, this line features a black 
watch case symbolizing toughness, with accents in vivid 
emergency colors that capture the world of professionals 
involved in rescue efforts and other critical missions. 

Employing a structure resistant to dust, mud, vibration, 
and shock, the MUDMASTER GWGB1000EC delivers solar-powered 
timekeeping with Bluetooth® and radio control accuracy, 
Triple Sensor technology, and more. The powerful design 
ensures durability and a comfortable fit thanks to an 
inventive combination of materials that includes carbon 
fiber-reinforced resin* and forged metals. Use the Location 
Indicator feature to see the direction of a target destination 
via an indicator hand on the watch.

*Due to the characteristics of carbon fiber-reinforced resin, 
the pattern and color tone that appears on the surface will 
vary model by model.

Basic Information
Case size (L× W× H): 58.7 × 52.1 × 16.2 mm
Weight: 114 g
Band: Bio-based resin band
Construction: Shock Resistant / Vibration resistant / Mud Resistant
Carbon Core Guard structure
Water resistance: 200-meter water resistance

Time adjustment: Radio-controlled Watch; Multi band 6
Bluetooth: Connects to a smartphone and automatically adjusts the time

Power supply and battery life: Tough Solar (Solar powered)

Sensor feature
Compass function: 
16 direction / direction angle (0 to 359°) measured, direction continuous 
measurement (60 seconds), north direction guideline function. 
Bearing memory function. Automatic horizontal, magnetic declination, 
and orientation correction function.

Barometric pressure measurement function 
(measurement range: 260~1,100hPa (7.65~32.45inHg), 1hPa (0.05inHg)), 
Barometric pressure trend graph display (past 20 hours displayed), 
pressure difference indicator (±10hPa) 
Barometric pressure trend information alarm (when a characteristic change 
in air pressure occurs, it will be notified by arrows and sound notification) 
The pressure trend graph can be changed to measurement every 30 minutes. 
That's for the last 5 hours.
*Changeover between hPa and inHg

Altitude measurement function/relative altimeter
(measurement range: -700 to 10,000 m (-2,300 to 32,800 ft), in units of 1 m (5 ft)) 

Advanced memory (up to 30 manual memories of measurement date, month, time, and altitude), 
Automatic recording data (highest/lowest altitude, auto accumulation (ascent/descending) 
memory) 
Altitude trend graph, altitude difference indicator (±100 m/ ±1,000 m) 
Measurement interval setting function (every 5 seconds / 2 minutes) 
*Every 1 second for the first 3 minutes only
*Changeover between meters (m) and feet (ft)
Temperature measurement function
(measurement range: -10 to 60 °C (14 °F to 140 °F), 0.1 °C (0.2 °F)) 
*Changeover between Celsius (℃) and Fahrenheit (℉)

Smartphone Link / App Connectivity
Smartphone Link feature
Mobile link (Wireless linking using Bluetooth®)

Apps
CASIO WATCHES

App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
App information
Time & place
Mission log
Location Indicator
Location Memory
Mode/Display switching customization
Auto altitude correction
Phone finder

Exterior
Glass: Sapphire crystal with anti-reflective coating
Crown: Screw Lock Crown
Surface treatment: DLC Coating bezel
Compatible band size: 145 to 215 mm
Other: Neobrite

Watch Features
World time
38 time zones (55 cities + coordinated universal time), daylight saving on/off, 
auto summer time (DST) switching, Home city/World time city swapping

Sunrise/sunset display
Sunrise, sunset time display
Sunrise time and sunset time for specific date

Stopwatch
1/100-second stopwatch
Measuring capacity: 23:59'59.99''
Measuring modes: Elapsed time, split time, 1st-2nd place times

Timer
Countdown timer
Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 minute to 60 minutes (1-minute increments)

Alarm/hourly time signal
5 daily alarms
Hourly time signal

Light
Double LED light
LED light for the face (Full auto LED light, Super illuminator, selectable illumination 
duration (1.5 seconds or 3 seconds), afterglow)
LED backlight for the digital display (Full auto LED light, Super illuminator, selectable
illumination duration (1.5 seconds or 3 seconds), afterglow)

Light color
LED:White

Calendar
Full auto-calendar (to year 2099)

Mute feature
Button operation tone on/off

Hand home position correction feature
The auto hand home position correction

Energy saving feature
Power Saving (display goes blank and hands stop to save power when the watch is left in the dark)

Battery display/alert
Battery level indicator

Run time
Approx. battery operating time:
6 months on rechargeable battery (operation period with normal use without exposure 
to light after charge)
24 months on rechargeable battery (operation period when stored in total darkness 
with the power save function on after full charge)

Accuracy
Accuracy: ±15 seconds per month (with no signal calibration and mobile link function)

Other features
12/24-hour format
Hand shift feature (Hands move out of the way to provide an unobstructed view of digital 
display contents.)
Regular timekeeping:
Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 
2 dials
Digital: Hour, minute, second, pm, month, date, day

Time adjustment details
Time Calibration Signals
Station name: DCF77 (Mainflingen, Germany)
Frequency: 77.5 kHz
Station name: MSF (Anthorn, England)
Frequency: 60.0 kHz
Station name: WWVB (Fort Collins, United States)
Frequency: 60.0 kHz
Station name: JJY (Fukushima, Fukuoka/Saga, Japan)
Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga)
Station name: BPC (Shangqiu City, Henan Province, China)
Frequency: 68.5 kHz
Time calibration signal reception
Auto receive up to six* times a day (remaining auto receives canceled as soon as 
one is successful)
*5 times a day for the Chinese calibration signal
Manual receive
The latest signal reception results