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gwg-b1000 | CASIO

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MUDMASTER flagship watch: Strength and functionality for mastery of extreme conditions

Presenting the Master of G MUDMASTER flagship timepiece. This analogue-digital combination watch delivers outstanding durability and a comfortable fit with a robust exterior built with metal components. In addition to solar-powered radio control and Triple Sensor features, Smartphone Link connectivity is included as well, making it easy to set navigation end points, manage activity logs, and more. A comfortable size is realised with the watch’s metal exterior, achieved with high-precision forging techniques and the Carbon Core Guard structure of the case. A timepiece combining a carbon fibre-reinforced resin case that offers high strength and outstanding durability with metal materials.



Tough design inspired by professional gear

Inspired by the adventurous spirit exemplified by tearing across the wastelands in “overlanding” style, the design incorporates the solid, rugged look of offroad vehicles and survival gear. With the multi-dimensional form of the multi-component structure, the large-diameter dial, and oversized buttons, the chronograph delivers durability, operability, and readability, with exterior design combining practicality with aesthetic appeal.

Guard structure integrating components made with different materials

The timepiece employs a newly developed guard structure that combines components made with different materials: stainless steel for the bezel ring, upper and lower bezel guards, and front button guard, and carbon fibre-reinforced resin for left and right side button guards. For the bezel guards, the guard sections alone are cut out of components forged into bezel shapes. The complex moulded form of the front button guard is achieved with a high degree of precision using metal injection moulding (MIM). A diamond-like carbon (DLC) coating is applied to the materials’ surfaces to provide even greater abrasion resistance.

Exploded view of the G-SHOCK MUDMASTER GWGB1000 watch parts

Dust- and mud-resistance plus vibration resistance, to withstand use in the harshest conditions

The buttons are protected by cylindrical stainless-steel parts, and the button shafts are equipped with gasket fittings. The crown features a screw-lock construction to prevent contamination with mud and dust. Also, the sides and underside of the module incorporate αGEL to ensure vibration resistance.

*αGEL is a registered trademark of Taica Corporation in Japan and other countries.

Exploded view of the G-SHOCK MUDMASTER GWGB1000 watch parts

Triple Sensor to stay on top of changing conditions

Includes a pair of compasses, an altimeter/barometer, and a thermometer. The second hand indicates north, while the indicator hand shows the recorded direction (bearing memory) and the direction to a point specified in the app (location indicator). These handy features help with checking the direction of a desired destination.

Digital Compass

60-second continuous direction measurement.
Includes auto horizontal compensation.

GWGB1000 Digital Compass with 16 directions display and degree bearings


Measures the temperature at the current location.*

Measures the temperature at the current location.*

GWGB1000 Thermometer with temperature display

*When measuring the ambient temperature, be sure the watch is removed from the wrist to avoid interference from body temperature, perspiration (water droplets), direct sunlight, and other external factors.


Sudden atmospheric pressure change alarm. 

Sudden atmospheric pressure change alarm. 

GWGB1000 Barometer with atmospheric pressure differential indicator graph and hPa display


Altitude measurement interval 1 sec.*
Measurement unit 1 m.

GWGB1000 Altimeter with altitude display graph and differential indicator

*Takes measurements every second for the first 3 minutes and every 5 seconds or 2 minutes thereafter(selectable).

Carbon Core Guard structure


Carbon Core Guard structure

A carbon fiber-reinforced resin case protects the module, making the most of the high degree of strength and outstanding durability delivered by the carbon material to achieve a size ensuring a comfortable fit.

Attention to materials: Bio-based resin


Attention to materials: Bio-based resin

Key resin components of the bezel, case, and band are made with bio-based resins. Produced using renewable organic resources, the material is expected to help reduce environmental impact.

*Graphic is included for illustrative purposes.

Solar-powered timekeeping with Bluetooth® and radio control for enhanced accuracy and reliability


Solar-powered timekeeping with Bluetooth® and radio control for enhanced accuracy and reliability

Super Illuminator (high-brightness full-auto double LED light) for maintaining watch readability in the dark


Super Illuminator (high-brightness full-auto double LED light) for maintaining watch readability in the dark

*Image shows the GWG-B1000-1A.

Scratch-resistant, highly transparent sapphire crystal with an anti-reflective coating


Scratch-resistant, highly transparent sapphire crystal with an anti-reflective coating


G-SHOCK watch / smartphone application icon

Multiple functions, all at your fingertips
(Smartphone app)

- Automatic time adjustment (four times a day)
- Easy watch setting
- World time (about 300 cities)
- Mission Log
(The altitude measured by the watch and the course obtained from a smartphone’s GPS are automatically recorded by the app. An altitude point can be plotted on the map.)
- Location Indicator
(Watch displays the direction and distance to a location which is recorded using Location Memory or manually set on the map within the app.)
- Location Memory
(Pressing a button on the watch records the current location on a map within the app.)
- Mode customisation
(The watch modes can be turned on and off on the app and can be rearranged in preferred order according to need or situation.)
- Automatic altitude adjustment
(Altitude measurement values on the watch are automatically adjusted based on altitude data acquired from the smartphone GPS.*)
- Phone finder

*Since GPS information may contain errors in principle, the measurement values may not match the actual altitude.

SPECIFICATIONS (Watch Functions)

• Shock-resistant structure
• Dust and mud-resistant structure
• Vibration-resistant structure
• 20-bar water resistance
• Solar-powered
• Smartphone Link
• Radio-controlled (Multiband 6)
• Auto hand home position correction
• Hand shift feature
• Digital compass
• Barometer
• Altimeter
• Thermometer
• Sunrise and sunset time display
• World time (55 cities)
• 1/100-second stopwatch
• Countdown timer
• 5 daily alarms
• Full-auto double LED light (Super Illuminator)

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. Any use of such marks and logos by Casio Computer Co., Ltd. is under licence.

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