CASIO G-SHOCK GG-B100X-1ADR MUDMASTER MASTER OF G ANALOG-DIGITAL BLACK CARBON WATCH

The GG-B100X-1ADR is the Mudmaster — G-Shock's Master of G tool watch built for the roughest land environments. The GG-B100X uses high-rigidity carbon fiber-reinforced resin for the case, creating a structure that resists warping, maintains a tight seal, and absorbs shocks that would crack conventional materials. Mud filters on the buttons, a stainless steel panel back, and a back cover made of shock-resistant glass-fiber resin keep dust and debris out. The three-layer bezel incorporates carbon fiber inserts between fine resin layers. The rugged, angular design is inspired by the gasoline jerrycans mounted to off-road vehicles — a deliberate visual reference to machines built to go where roads don't exist.

Module 5744 powers the Mudmaster's Quad Sensor system: digital compass with hand indication of north, altimeter measuring up to 10,000 metres with automatic data logging, barometer with pressure tendency alarm for incoming weather changes, thermometer, and a step counter via 3-axis accelerometer. Bluetooth smartphone link connects to the CASIO WATCHES app for automatic time correction, Mission Log (records altitude data from the watch plus route data from your phone's GPS), and location memory. Analog-digital display with three hands and hand shift, world time across 38 time zones, sunrise/sunset display, double LED Super Illuminator (separate LEDs for the analog face and digital display), Neobrite lume, 200-metre water resistance. Bio-based resin for key case and band components. At 55.4 × 51.3 × 19.4 mm and 93 grams, the Mudmaster is large but purposeful — every millimetre is structural. CR2025 battery, approximately two-year life.

At a Glance

Why You'll Love It

• The Quad Sensor system gives you four environmental readings from your wrist: compass bearing with analog hand indication of north for navigation, altimeter up to 10,000 metres for elevation tracking, barometer with a pressure tendency alarm that warns you when a storm front is approaching (significant pressure drops trigger a beep and arrow display), and thermometer. The step counter via 3-axis accelerometer adds activity tracking on top. This is a field instrument, not a feature list — each sensor delivers data you can act on in real time.
• Mud resistance is the Mudmaster's defining spec. Button gaskets and filters prevent dust, sand, and mud from entering the case — the watch is designed for disaster relief, construction, forestry, and any environment where fine particles get everywhere. The carbon fiber-reinforced resin case and Carbon Core Guard structure absorb shocks without warping, and the stainless steel panel back and glass-fiber resin back cover maintain the seal under impact.
• The Mission Log function automatically records altitude data from the watch and route data from your phone's GPS, creating a combined log of where you went and how high you climbed. Location Memory lets you mark specific coordinates. Both sync to the CASIO WATCHES app, building a history of your outdoor activities over time.
• The barometric pressure tendency graph shows the last 20 or 56 hours of atmospheric pressure changes — essential for predicting weather shifts when you're outdoors without phone signal. The pressure tendency alarm buzzes when pressure drops or rises significantly, giving you advance warning of incoming weather before you can see it.
• Sunrise and sunset time display shows you exactly how much daylight remains for any specific date — plan your hike turnaround time, camp setup, or activity window with data rather than estimation.
• Bio-based resin for key case and band components — produced from renewable organic resources. The sustainability angle is a 2026 addition to the Mudmaster line, reducing environmental impact without compromising the structural toughness the watch is built around.

Perfect For

Key Features

• Quad Sensor — Digital compass (16 points, 0–359°, hand indication of north), altimeter (-700 to 10,000 m, auto log), barometer (260–1,100 hPa, pressure tendency alarm), thermometer (-10 to 60°C), and step counter (3-axis accelerometer, 0–999,999 steps).
• Mud Resistant + Carbon Core Guard — Button gaskets and filters block dust/mud. Carbon fiber-reinforced resin case. Stainless steel panel back. Glass-fiber resin back cover. Three-layer carbon fiber bezel.
• Bluetooth smartphone link + Mission Log — Auto time correction, altitude + route logging via CASIO WATCHES app, location memory, phone finder, ~300 world time cities.
• Barometric pressure tendency alarm — Buzzes and displays an arrow when atmospheric pressure changes significantly — advance warning of incoming weather.
• Sunrise/sunset display — Shows sunrise and sunset times for any specific date. Plan outdoor activities around available daylight.
• 200-metre water resistance (20 BAR) — Suitable for swimming, snorkelling, and recreational water sports.

Technical Specifications

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Frequently Asked Questions

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