For the fearless adventurer and nature lover, a tough and rugged Master of G MUDMASTER featuring bezel and case constructed of heavy duty carbon and environmentally responsible materials.

The watches of the G-SHOCK Master of G line, developed for professionals working in the harshest environments, come equipped with even tougher functionality. And the MUDMASTER takes this another step further with the ability to handle the roughest rubble and debris-strewn terrains, earning the appreciation and trust of rangers and rescue teams operating in extreme environments. 

The MUDMASTER GG-B100X employs high rigidity carbon for the carbon fiber-reinforced case to keep damage and warping at bay and ensure a tight seal and excellent shock resistance. Featuring a filter to protect against mud, a stainless-steel panel back, and a back cover made of shock-resistant fine resin embedded with glass fibers, it provides a high level of resistance to dust and mud. The bezel also uses three layers of fine resin with carbon fiber inserts. The rugged design evokes the gasoline jerrycans mounted to off-road vehicles tough enough to traverse the most challenging terrain. Key components for the case and band are made with bio-based resin. Produced using renewable organic resources, this material is expected to help reduce environmental impact. 

Practical and functional, the watch is equipped with digital compass, altimeter/barometer, and thermometer, as well as step counter. Easily correct the time using the dedicated app and tap into loads of other useful features including the Mission Log, which automatically records altitude data obtained from the watch and route data obtained by your smartphone. 

You can depend on this tough timepiece to deliver what you need to make quick decisions and take decisive action.

• Case / bezel material: Bio-based Carbon / Resin
  
• Carbon fiber bezel
  
• Bio-based resin band
  
• Neobrite
  
• Mineral Glass
  
• Spherical Glass
  
• Carbon Core Guard structure
  
• Mud Resistant
  
• Shock Resistant
  
• 200-meter water resistance
  
• Double LED light
  
• LED light for the face (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  
• LED backlight for the digital display (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  
• Mobile link (Wireless linking using Bluetooth®)
  
• LED:White
  
• Sunrise, sunset time display
  
• Sunrise time and sunset time for specific date
  
• Step count using a 3-axis acceleration sensor: 0 to 999,999 step count display range
  
• Power Saving: Auto sensor sleep state entry after fixed period of non-activity
  
• Altimeter
  
• Measuring range: -700 to 10,000 m (-2,300 to 32,800 ft.)
  
• Measuring unit: 1 m (5 ft.)
  
• Hand indication graph of altitude differential
  
• Manual memory measurements (up to 14 records, each including altitude, date, time)
  
• Auto log data (High/low altitudes, cumulative ascent and descent)
  
• Others: Relative altitude readings (±100 m /±1000 m), selectable measurement interval: 5 seconds or 2 minutes (1 second for first 3 minutes only)
  *Changeover between meters (m) and feet (ft)
  
• Barometer
  
• Measuring range: 260 to 1,100 hPa (7.65 to 32.45 inHg)
  
• Measuring unit: 1 hPa (0.05 inHg)
  
• Hand indication of pressure differential (±10 hPa)
  
• Atmospheric pressure tendency graph (last 20 hours or last 56 hours)
  
• Barometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure)
  
• The atmospheric pressure tendency graph can show the last 20 minutes or last 56 minutes of measurements.
  
• The hand indication of pressure differential shows values in units of ±0.1 hPa.
  *Changeover between hPa and inHg
  
• Digital compass
  
• Measures and displays direction as one of 16 points
  
• Measuring range: 0 to 359°
  
• Measuring unit: 1°
  
• 60 seconds continuous measurement
  
• Hand indication of north
  
• Magnetic declination correction
  
• Direction calibration (2-point calibration, figure eight calibration, auto calibration)
  
• Thermometer
  
• Measuring range: -10 to 60℃ (14 to 140℉)
• Measuring unit: 0.1℃ (0.2℉)
  *Changeover between Celsius (℃) and Fahrenheit (℉)
  
• World time, 38 time zones (38 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping
  
• Sunrise, sunset time display, Sunrise time and sunset time for specific date
  
• 1/100-second stopwatch
  00'00''00~59'59''99 (for the first 60 minutes)
  1:00'00~23:59'59 (after 60 minutes)
  
• Measuring unit:
  1/100 second (for the first 60 minutes)
  1 second (after 60 minutes)
  
• Measuring modes: Elapsed time, split time, 1st-2nd place times
  
• Countdown timer
  
• Measuring unit: 1 second
  
• Countdown range: 24 hours
  
• Countdown start time setting range: 1 second to 24 hours (1-minute increments and 1-hour increments)
  
• 5 daily alarms
  
• Hourly time signal
  
• Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)
  
• Full auto-calendar (to year 2099)
  
• 12/24-hour format
  
• Button operation tone on/off
  
• Regular timekeeping:
  
• Analog: 3 hands (hour, minute (hand moves every 10 seconds), second)
  
• Digital: Hour, minute, second, am/pm, month, date, day
  
• Accuracy: ±15 seconds per month (with no mobile link function)
  
• Approx. battery life: 2 years on CR2025
  
• Size of case : 55.4 × 51.3 × 19.4 mm
  
• Total weight : 93 g