The new dust- and mud-resistant MUDMASTER GWG-B1000 features exterior components in metal for a solid, powerful design.
Since G-SHOCK first came out in 1983, Casio has continued to introduce functional, structural, and design advancements to the line’s outstanding shock resistance. Among all the great G-SHOCK watches, the Master of G line, designed for use in extreme conditions, has proven popular for its superior toughness.
The new GWG-B1000, an addition to the Master of G line, is a powerful dust- and mud-resistant MUDMASTER designed for sandy, dirty environments. The robust metal exterior retains G-SHOCK shock resistance in a rugged design with an eye-catching multi-dimensional form.
The protector parts at the 12 and 6 o’clock positions guard the watch glass, which is typically the most shock-susceptible, and they are treated with a diamond-like carbon (DLC) coating to provide even greater abrasion resistance. These parts are cut out of components that are first forged into bezel shapes in a painstaking production process that renders complex shapes in metal. The complex molded form of the front button guard is achieved with a different method, metal injection molding (MIM).*
* Metal injection molding is a technique that combines injection molding and a sintering process. Fine metal powder is mixed with a binder, injection molded in a method similar to that used with plastics, and then sintered to produce high-precision metal parts in complex three-dimensional shapes.
This timepiece also features functions that users on land missions need to execute their pursuits. It is the first G-SHOCK equipped with a triple sensor that measures compass bearing, altitude/barometric pressure, and temperature, as well as solar charging and radio wave reception, that also comes with smartphone connectivity. When the watch is paired with a smartphone, the dedicated app on the phone offers easy operation of various useful features, including Location Indicator, which points the inset dial indicator hand in the direction of a location recorded on the map within the app, and Mission Log, which records activity history.
Casio will continue to develop timepieces with ever more advanced shock resistance and original Casio functionality to support the professionals who constantly push the limits.
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Construction |
Shock resistant; mud resistant; vibration-resistant |
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Water Resistance |
200 meters |
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Radio Frequency |
77.5 kHz (DCF77: Germany), 60 kHz (MSF: UK), 60 kHz (WWVB: USA), 40 kHz (JJY: Fukushima, Japan), 60 kHz (JJY: Kyushu, Japan), 68.5 kHz (BPC: China) |
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Radio Wave Reception |
Automatic reception up to six times a day (except for use in China: up to five times a day), manual reception |
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Digital Compass |
Measures and displays direction as one of 16 points; measuring range: 0° to 359°; 60 seconds continuous measurement; graphical display of north, south, east, and west; bearing memory; bidirectional calibration and magnetic declination correction |
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Barometer |
Measuring range: 260 hPa to 1,100 hPa (7.65 inHg to 32.45 inHg); measuring unit: 1 hPa (0.05 inHg); atmospheric pressure tendency graph (past 20 hours graph display); atmospheric pressure differential graphic; barometric pressure tendency information alarm |
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Altimeter |
Measuring range: -700 m to 10,000 m (-2,300 ft. to 32,800 ft.); manual memory measurements (up to 30 records, each including altitude, date, time); auto log data (high/low altitudes, cumulative ascent and descent); 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 |
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Thermometer |
Measuring range: -10°C to 60°C (14°F to 140°F) |
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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 |
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Stopwatch |
1/100-second stopwatch Measuring capacity: 23:59'59.99'' Split time |
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Countdown Timer |
Measuring unit: 1 minute; countdown range: 60 minutes; countdown start time setting range: 1 second to 60 minutess (1-second increments and 1-minute increments) |
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Alarm |
5 independent daily alarms, hourly time signal |
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Mobile Link Features (Automatic Connection, Wireless Linking with Bluetooth® Devices) |
Mission Log Calorie calculator Location Indicator Mode/display switching customization Automatic altitude adjustment Auto time adjustment Approximately 300 world time cities+ user-added point Home time/world time swapping Automatic daylight savings time/time zone updates Timer and alarm setting Phone finder |
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Other Functions |
Sunrise/sunset time display; battery level indicator; full auto-calendar; 12/24-hour format; button operation tone on/off; full auto LED backlight (Super Illuminator) with afterglow: 1.5 or 3.0 seconds |
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Power Source |
Tough Solar power system (solar-charging system) |
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Continuous Operation |
About 6 months after full charge, using all functions but without solar charging About 24 months with the power-saving function ON after full charge |
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Size of Case |
58.7 × 52.1 × 16.2 mm |
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Total Weight |
Approx. 114 g |
Available this October from g-shock.co.uk £699.

