Casio G-Shock Mudmaster GG-B100X Watch -1A3ER

Digital-analog outdoor watch in a black and green color scheme, featuring a bezel made from carbon fiber. The Carbon Core Guard construction maximizes resistance to impacts, mud, and dust, while 20 bar water resistance lets you use the watch while swimming and diving without an oxygen tank. This model is equipped with Quad Sensor technology, Bluetooth connectivity, and features to support navigation in the field as well as tracking outdoor activities.

Precision is ensured by a quartz movement with accuracy of ±15 seconds per month, powered by a CR2025 battery providing up to about 2 years of operation. The Bluetooth module enables connection between the watch and your smartphone, automatic time syncing, and access to extra features via the Casio Watches app. The app allows you to change settings, manage world time, save routes, and activate the phone finder function.

The Mudmaster GG-B100XM-1AER features the Quad Sensor system:

• digital compass – shows direction in 16 points, ranging 0–359 degrees, indicates north with a pointer, and lets you correct for magnetic declination
• altimeter – measures altitude from –700 to 10,000 meters, saves up to 14 manual readings, and automatically logs ascent and descent data
• barometer – monitors pressure in the range of 260–1100 hPa, displays a pressure trend graph, and alerts you to sudden weather changes
• thermometer – measures ambient temperature from –10 to +60 °C
• pedometer – 3-axis accelerometer counts up to 999,999 steps

When connected to the app, two field functions become available: Mission Log, which automatically records your route and elevation profile, and Location Indicator – after adding a point on the map, the second hand points in its direction, while the screen displays the distance to the target.

20 bar water resistance protects the watch during submersion up to 200 meters. Tightly sealed buttons and an internal filter system help block mud, dust, and small debris from entering the mechanism. The shock-resistant case stands out during intensive outdoor activities.

The case, measuring 55.4 × 51.3 × 19.4 mm, is made from resin reinforced with carbon fiber. The Carbon Core Guard construction increases rigidity and protects the movement from deformation. The carbon bezel is made from three layers of resin and carbon fiber inserts, with a transparent outer layer that reveals the carbon structure inside. The dial is protected by spherical mineral glass, and the time is displayed via three hands plus a negative digital display. Side buttons control the features, and the hand shift function gives clear access to digital data.

The dual LED Super Illuminator lighting system illuminates both the dial and digital display. Auto Light technology turns on the light when you tilt the watch toward your face, with a selectable illumination time of 1.5 or 3 seconds. The hands are coated with Neobrite for readability in the dark.

The strap is made from durable, bio-based resin that’s resistant to moisture and sweat. Carbon elements on the underside reinforce the attachment and improve wrist fit. A metal buckle lets you adjust the length in a range of 145–215 mm.

• watch
• original manufacturer packaging
• user manual
• warranty card

• Carbon Core Guard construction
• carbon bezel with carbon fiber inserts
• shock, mud, and dust resistance
• 20 bar water resistance
• digital compass
• altimeter up to 10,000 m
• barometer with pressure change alert
• thermometer from –10 to +60 °C
• pedometer
• Bluetooth connectivity
• compatible with Casio Watches app
• Mission Log and Location Indicator features
• Super Illuminator lighting
• hands with Neobrite coating
• spherical mineral glass
• world time, stopwatch, timer, and alarms
• bio-based resin strap