The G-SHOCK Master of G Mudmaster GWG-B1000-3A is built for extreme land environments with a rugged guarding structure that combines metal components and a carbon fiber-reinforced resin case.

Equipped with Tough Solar power, radio-controlled Multi Band 6 timekeeping, and Bluetooth smartphone connectivity, this analog-digital timepiece maintains pinpoint accuracy worldwide.

An integrated Triple Sensor provides compass bearing, altitude, barometric pressure, and temperature readings, while scratch-resistant sapphire crystal and double LED lights ensure clear visibility in harsh conditions.

Key Features

Case size (L× W× H)	58.7 × 52.1 × 16.2 mm
Weight	114 g
Case and bezel material	Bio-based Resin / Stainless steel
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 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
Glass	Sapphire crystal with anti-reflective coating
Crown	Screw Lock Crown
Surface treatment	DLC Coating bezel, Gray ion plated bezel
Compatible band size	145 to 215 mm
Other	Neobrite
World time	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

Highlights

Shock resistant
Resistant to mud
20 bar water resistant
Timekeeping accuracy
Stable solar power
Smartphone connectivity

Downloads

Operation Guide

Frequently asked questions

What power source does this watch use?

It is powered by Tough Solar, utilizing solar power with a rechargeable battery that operates up to 6 months under normal use or 24 months in power-saving storage.

What is the water resistance rating of this timepiece?

This watch features a 200-meter (20 bar) water resistance rating.

What environmental and movement resistance features are built in?

The watch is built with a Carbon Core Guard structure that offers shock resistance, vibration resistance with αGEL, and mud resistance with gasket-fitted button shafts and a screw-lock crown.

What measurements can the Triple Sensor provide?

The Triple Sensor measures digital compass direction, altitude from -700 to 10,000 m, barometric pressure from 260 to 1,100 hPa, and temperature from -10 to 60 °C.

How does the watch maintain accurate time?

It adjusts time using radio control calibration signals across Multi Band 6 stations as well as automatic Bluetooth synchronization via the CASIO WATCHES smartphone app.

What material is used for the watch glass?

The watch is equipped with scratch-resistant sapphire crystal featuring an anti-reflective coating.

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