Conquer tough terrain and grab attention with a rugged timepiece boasting a bold, eye-catching color scheme.

Designed to work even in the harshest environments, MASTER of G specialty watches take timekeeping to new heights with a rugged design accented in the bright yellow used for emergency rescues.

The GGB100 MUDMASTER employs high rigidity carbon in the case to keep damage and warping at bay and ensure extreme airtightness and shock resistance. This timepiece also features 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, giving it a high level of resistance to dust and mud. The bezel also uses three layers of fine resin with carbon fiber inserts. This tough, rugged design is accented in bright bold yellow.

Practical and functional, this watch is equipped with digital compass, altimeter/barometer, thermometer and step counter. Easily correct the time using the dedicated CASIO WATCHES 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.

Basic Information

• Case size (L× W× H)

  55.4 × 51.3 × 19.4 mm

• Weight

  92 g

• Case and bezel material

  Carbon / Resin　

• Band

  Resin Band

• Construction

  Shock Resistant
  Mud Resistant
  Carbon Core Guard structure

• Water resistance

  200-meter water resistance

• Power supply and battery life

  Approx. battery life: 2 years on CR2025

• Sensor feature

  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 (℉)
  

Smartphone Link/App Connectivity Features

• Smartphone Link feature

  Mobile link (Wireless linking using Bluetooth®)

• Apps

  CASIO WATCHES

Exterior

• Glass

  Mineral Glass
  Spherical Glass

• Compatible band size

  145 to 215 mm

• Other

  Neobrite

Watch Features

• World time

  World time
  38 time zones (38 cities coordinated universal time), daylight saving on/off, Home city/World time city swapping

• Sunrise/sunset display

  Sunrise, sunset time display Sunrise time and sunset time for specific date

• Stopwatch

  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

• Timer

  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)

• Alarm/hourly time signal

  5 daily alarms
  Hourly time signal

• Light

  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)

• Light color

  LED:White

• Calendar

  Full auto-calendar (to year 2099)

• Mute feature

  Button operation tone on/off

• Accuracy

  Accuracy: ±15 seconds per month (with no mobile link function)

• Other features

  12/24-hour format
  Hand shift feature
  Regular timekeeping: Analog: 3 hands (hour, minute (hand moves every 10 seconds), second) Digital: Hour, minute, second, am/pm, month, date, day