CASIO G-SHOCK GG-B100X-1A9DR MUDMASTER MASTER OF G ANALOG-DIGITAL BLACK ORANGE WATCH

The GG-B100X-1A9DR is the orange-accented variant of the Mudmaster — the same carbon fiber-reinforced, mud-resistant, Quad Sensor-equipped Master of G tool watch as the all-black -1A, but with orange accent details on the dial, hands, and case markings that add high-visibility contrast to the black carbon exterior. The orange accents reference the high-vis colour coding used on heavy equipment, construction machinery, and emergency gear — a visual cue that reinforces the Mudmaster's identity as a watch built for harsh work environments.

Module 5744 and every specification are identical to the -1A: Quad Sensor (digital compass with hand indication of north, altimeter up to 10,000 metres with auto logging, barometer with pressure tendency alarm, thermometer, and step counter via 3-axis accelerometer), Bluetooth smartphone link with Mission Log, Carbon Core Guard with carbon fiber-reinforced bio-based resin case, mud-resistant sealed buttons, three-layer carbon fiber bezel, stainless steel panel back, double LED Super Illuminator, world time across 38 time zones, sunrise/sunset display, Neobrite lume, and 200-metre water resistance. 55.4 × 51.3 × 19.4 mm, 93 grams. CR2025, approximately two-year battery life.

At a Glance

Why You'll Love It

• The orange accents on the black carbon case are the visual difference between the -1A9 and the all-black -1A — and they serve a practical purpose beyond aesthetics. High-vis orange is the colour language of heavy machinery, emergency equipment, and field gear. On the Mudmaster, it makes the dial markings and hands easier to read at a glance in low-light or busy conditions, and it makes the watch easier to spot if you set it down on a worksite or trail.
• The Quad Sensor system delivers four environmental readings from your wrist: compass bearing with analog hand indication of north, altimeter up to 10,000 metres with automatic data logging, barometer with a pressure tendency alarm that warns of incoming weather shifts, thermometer, and step counter. Each sensor provides data you can act on in real time — navigation, elevation, weather prediction, temperature, activity tracking.
• Mud resistance is engineered into the buttons — gaskets and filters prevent dust, sand, and mud from entering the case. The carbon fiber-reinforced resin case and Carbon Core Guard structure resist warping and absorb shocks. The stainless steel panel back and glass-fiber resin back cover maintain the seal under impact. This is a watch designed for construction, forestry, disaster relief, and any environment where fine particles are unavoidable.
• The Mission Log function records altitude data from the watch's altimeter and route data from your phone's GPS, building a combined log in the CASIO WATCHES app. Over time, you accumulate a mapped history of your outdoor activities with elevation profiles — useful for hikers, trail runners, and field workers tracking their routes.
• The barometric pressure tendency alarm buzzes when atmospheric pressure changes significantly — advance warning of an incoming storm or weather shift before you can see it. The pressure graph shows the last 20 or 56 hours of atmospheric data.
• Bio-based resin for key case and band components reduces environmental impact. At 93 grams with a carbon fiber-reinforced structure, the Mudmaster is lighter than you'd expect for a watch this tough — the carbon construction carries the strength of a heavier build at lower weight.

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.
• Orange high-vis accents — Orange dial markings, hands, and case accents on black carbon body. High-visibility contrast for readability in field conditions.
• Bluetooth smartphone link + Mission Log — Auto time correction, altitude + route logging via CASIO WATCHES app, location memory, phone finder, ~300 world time cities.
• Sunrise/sunset display — Shows sunrise and sunset times for any specific date.
• 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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