The bold yellow hue of the Rescue Yellow series reflects the mindset of professionals who face danger head-on in rescue missions. This vivid color, symbolizing heightened awareness and urgency, takes center stage in a trio of G-SHOCK timepieces—GRAVITYMASTER, MUDMAN, and RANGEMAN—each from the renowned MASTER OF G line. Designed to perform under the most extreme conditions, these watches combine rugged durability with high-visibility styling. Set against a backdrop of powerful black, the striking yellow accents highlight the signature toughness that defines G-SHOCK.
G-SHOCK MASTER OF G - AIR GRAVITYMASTER Men Digital Watch GR-B300RY-1A9DR
Wherever you are, whatever the mission — the G-SHOCK Master of G line is built to support you.
Engineered for peak performance in the harshest airborne environments, the GRAVITYMASTER GR-B300RY-1A9DR stands ready for action. With a bold black exterior and a vibrant yellow band—mirroring the color used in emergency rescues and safety signage—this watch is designed for professionals tackling high-stakes operations.
Inspired by next-generation aircraft, the GR-B300RY-1A9DR features an organic, seamless exterior and a rugged Carbon Core Guard structure. Its wide 3D dial ensures superior legibility, while the lightweight design offers a comfortable fit. Key functions include dual-time display for simultaneous timekeeping in two cities, a flight log memory for tracking travel routes, and more.
Tough, tactical, and reliable, this is the watch you need to make fast decisions and lead confidently in extreme conditions.
Specifications
Basic Information
Case size (L× W× H)
59 × 54.7 × 15.7 mm
Weight
71 g
Case and bezel material
Bio-based Carbon / Bio-based resin / Stainless steel
Band
Bio-based resin band
Construction
Shock Resistant
Carbon Core Guard structure
Water resistance
200-meter water resistance
Time adjustment
Bluetooth: Connects to a smartphone and automatically adjusts the time
Power supply and battery life
Tough Solar (Solar powered)
Smartphone Link/App Connectivity Features
Smartphone Link feature
Mobile link (Wireless linking using Bluetooth®)
Apps
CASIO WATCHES
App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Flight log
Phone finder
Exterior
Glass
Mineral Glass
Crown
Screw Lock Crown
Surface treatment
Black ion plated bezel
Compatible band size
145 to 215 mm
Other
Neobrite
Watch Features
World time
Dual time (Home City time swapping)
Stopwatch
1-second stopwatch
Measuring capacity: 23:59'59.
Measuring modes: Elapsed time, split time
Timer
Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
Alarm/hourly time signal
Daily alarm
Light
LED light (Super Illuminator)
Afterglow
Light color
LED:White
Calendar
Full auto-calendar (to year 2099)
Energy saving feature
Power Saving (hands stop to save power when the watch is left in the dark)
Battery display/alert
Battery level indicator
Run time
Approx. battery operating time:
5 months on rechargeable battery (operation period with normal use without exposure to light after charge)
18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Accuracy
Accuracy: ±15 seconds per month (with no mobile link function)
Other features
Date display
Day indicator
Regular timekeeping:
Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)
Features:
Eye-Catching Contrast: Vibrant Rescue Yellow
Vivid yellow takes center stage as a signature color throughout the series. Commonly used in rescue equipment and emergency vehicles, this high-visibility hue stands out even in extreme weather, low light, and other harsh environments. Accents on the band and bezel top deliver a bold visual impact, while black and gray ion plating (IP) add a refined, rugged texture to metal components—perfect for gear designed for professionals.
Cutting-edge design with functional beauty
The GR-B300RY-1A9DR delivers the strength, readability, and functionality essential to an advanced pilot’s watch. Featuring a Carbon Core Guard structure and a wide 3D dial, it’s built to perform under pressure. Practical tools like dual-time display for two cities, flight log memory for tracking travel routes, and more ensure readiness for any mission.
Details:
Carbon Core Guard Structure: Strength Meets Lightweight Comfort
The carbon fiber-reinforced resin case protects the module while maintaining a compact size for a comfortable fit. This structure offers high strength and exceptional durability—ideal for use in the most demanding environments.
Eco-Conscious Design: Bio-Based Resin Materials
Key resin components, including the case and band, are made with bio-based resin derived from renewable organic sources. This material choice helps reduce environmental impact while maintaining the strength and performance G-SHOCK is known for.
Reliable Timekeeping: Solar Power with Bluetooth®
- GR-B300RY-1A9DR :- Bluetooth® connectivity
These features provide enhanced precision, power efficiency, and dependability, no matter where your mission takes you.
G-SHOCK MASTER OF G - LAND MUDMAN Digital Men Watch GW-9500MRY-1A9DR
For total support in the harshest environments, this MUDMAN watch delivers peak performance in punishing conditions on land. It features bold black to embody toughness, paired with a band in the same vivid yellow used in emergency rescues and safety signage. This striking design makes it a natural fit for professionals engaged in rescue operations and other high-stakes missions.
The MUDMAN GW-9500MRY-1A9DR goes beyond its dust-, mud-, and shock-resistant build to offer advanced functionality, including radio-controlled, solar-powered timekeeping and precise measurements via Triple Sensor technology. The digital compass display, enhanced with a duplex LCD, offers improved readability and greater practical utility. Bezel components in stainless steel with black ion plating complete the watch’s rugged, no-nonsense aesthetic.
This resilient timepiece equips you with the tools you need to respond swiftly and decisively, even in the most extreme land-based conditions.
Specifications
Basic Information
Case size (L× W× H)
56.7 × 52.7 × 14.8 mm
Weight
88 g
Case and bezel material
Bio-based Carbon / Bio-based resin / Stainless steel
Band
Bio-based resin band
Construction
Shock Resistant
Mud Resistant
Carbon Core Guard structure
Water resistance
200-meter water resistance
Time adjustment
Radio-controlled Watch; Multi band 6
Power supply and battery life
Tough Solar (Solar powered)
Sensor feature
Digital compass
Measures and displays direction as one of 16 points
Measuring range: 0 to 359°
Measuring unit: 1°
60 seconds continuous measurement
Graphic direction pointer
Bidirectional calibration
Magnetic declination correction
Bearing memory
Altimeter
Measuring range: -700 to 10,000 m (-2,300 to 32,800 ft.)
Measuring unit: 1 m (5 ft.)
Manual memory measurements (up to 30 records, each including altitude, date, time)
Auto log data (High/low altitudes, auto cumulative ascent and descent)
Trek log data (up to 14 records of high/low altitudes, auto cumulative ascent and descent of particular treks)
Others: Relative altitude readings (-3,000 to 3,000 m)
Selectable measurement interval: 5 seconds or 2 minutes
*1 second for first 3 minutes only
*Changeover between meters (m) and feet (ft)
Barometer
Display range: 260 to 1,100 hPa (7.65 to 32.45 inHg)
Display unit: 1 hPa (0.05 inHg)
Atmospheric pressure tendency graph (Past 42 hours of readings)
Atmospheric pressure differential graphic
Barometric pressure tendency information alarm (beep and arrow indicate significant changes in pressure)
*Changeover between hPa and inHg
Thermometer
Display range: -10 to 60℃ (14 to 140℉)
Display unit: 0.1℃ (0.2℉)
*Changeover between Celsius (℃) and Fahrenheit (℉)
Exterior
Glass
Mineral Glass
Surface treatment
Black ion plated bezel
Compatible band size
145 to 215 mm
Watch Features
World time
World time
31 time zones (48 cities + coordinated universal time), daylight saving on/off
Sunrise/sunset display
Sunrise, sunset time display
Sunrise time and sunset time for specific date
Stopwatch
1/10-second stopwatch
Measuring capacity: 999:59'59.9''
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 minute to 24 hours (1-minute increments and 1-hour increments)
Alarm/hourly time signal
5 daily alarms (with 1 snooze alarm)
Hourly time signal
Light
LED backlight (Super Illuminator)
Full auto LED light, 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
Energy saving feature
Power Saving (Turns off the display when the watch is left in the dark)
Battery display/alert
Battery level indicator
Run time
Approx. battery operating time:
6 months on rechargeable battery (operation period with normal use without exposure to light after full charge)
26 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Accuracy
Accuracy: ±15 seconds per month (with no signal calibration)
Other features
12/24-hour format
Regular timekeeping:
Hour, minute, second, pm, month, date, day
Duplex LC display
Time adjustment details
Time calibration signal reception
Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful)
*5 times a day for the Chinese calibration signal
Manual receive
The latest signal reception results
Time Calibration Signals
Station name: DCF77 (Mainflingen, Germany)
Frequency: 77.5 kHz
Station name: MSF (Anthorn, England)
Frequency: 60.0 kHz
Station name: WWVB (Fort Collins, United States)
Frequency: 60.0 kHz
Station name: JJY (Fukushima, Fukuoka/Saga, Japan)
Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga)
Station name: BPC (Shangqiu City, Henan Province, China)
Frequency: 68.5 kHz
Features:
Eye-Catching Contrast: Vibrant Rescue Yellow
A bold rescue yellow is prominently featured throughout the watch design as a signature color. Commonly used on rescue equipment and emergency vehicles, this vivid hue functions as a cautionary signal, standing out in extreme weather, low visibility, and other demanding conditions. Accents on the band and bezel’s top enhance visibility and create a striking contrast. Black and gray ion plating on the metal components adds rugged texture, reinforcing a design built for professional-grade toughness.
Duplex LCD Display
Engineered to withstand dust, mud, and shocks, the MUDMAN GW-9500MRY-1A9DR features Triple Sensor technology that measures compass bearing, altitude/barometric pressure, and temperature. Its digital compass utilizes a duplex LCD for enhanced clarity and practical readability, making it ideal for critical land-based missions.
Details:
Carbon Core Guard Structure: Both Strong and Lightweight
The carbon fiber-reinforced resin case delivers outstanding strength and durability, protecting the internal module while ensuring a compact size and comfortable fit.
Eco-Friendly Materials: Bio-Based Resin
Resin components in the case, band, and other areas are made from bio-based resin, produced using renewable organic resources, to help reduce environmental impact without compromising performance.
Solar-Powered Timekeeping with Radio Control for Enhanced Accuracy and Reliability
GW-9500MRY-1A9DR: Radio-controlled timekeeping
Super Illuminator: High-Brightness LED Light for Visibility in the Dark
- GW-9500MRY-1A9DR :- Full-auto LCD illumination
G-SHOCK MASTER OF G - LAND RANGEMAN Digital Men Watch GPR-H1000RY-1A9DR
Wherever you are, whatever you're doing — the G-SHOCK Master of G series is built to back you up.
Designed for peak performance in the most punishing environments, the RANGEMAN is your go-to companion on land. Its bold black case exudes toughness, while the high-visibility yellow band — inspired by emergency rescue and safety gear — ensures it stands out when it matters most. Every detail is made with professionals in mind, from rescue teams to those on critical missions.
The RANGEMAN GPRH1000RY is engineered with a dust-, mud-, and shock-resistant structure and packed with six advanced sensors to monitor everything from heart rate to location, distance, and speed via built-in GPS. Stay on top of your physical condition in real time across nine activity modes, including trekking.
Rugged, reliable, and ready — this watch gives you the data you need to act fast and stay ahead in the toughest conditions.
Specifications
Basic Information
Case size (L× W× H)
60.6 × 53.2 × 20.3 mm
Weight
92 g
Case and bezel material
Resin / Bio-based resin
Band
Bio-based resin band
Construction
Shock Resistant
Mud Resistant
Water resistance
200-meter water resistance
Time adjustment
GPS signal reception: Manual receive (position information, time information)
Bluetooth: Connects to a smartphone and automatically adjusts the time
Power supply and battery life
Charging system compatible with dedicated cable (requires device with Type-A USB terminal)
Solar powered
Sensor feature
Activities: Multi-sport (running, trekking, walking, biking, swimming, others); Calculate and display distance, speed, pace, and other information using GPS or accelerometer; auto/manual lap function; auto pause function
Training Analysis: Cardio load status
Activity Log Data: Up to 100 runs with up to 200 laps each, measurement time, distance, pace, running index, calories burned, energy source used, heart rate, maximum heart rate, cardio load, pitch, maximum pitch, stride, altitude gained, number of strokes, SWOLF
Wrist Heart Rate Measurement (30～220 bpm): Heart rate, target heart rate setting, graphic heart rate zone indication, heart rate graph, maximum heart rate, minimum heart rate
Sleep Measurement: Sleep recovery status (6 stages), sleep recovery stage display, sleep status (5 stages), sleep score display range (1 to 100, measurement unit: 1), autonomic nerve status (5 stages), ANS score range (-10 to +10, measurement unit: 0.1)
Blood Oxygen Level Measurement*
Breathing Exercise: Setting range (2 to 20 minutes in 1-minute increments), biofeedback, zone-specific time summary
Step Count Measurement: 3-axis acceleration sensor, step count display range (0 to 99,999 steps), step count reset: automatic reset at midnight every day
Active Time Measurement: Special algorithm measures movement time using status analysis (walking, running, biking, undefined)
Life Log: Step count, step count graph (week, month, 6 months), calories burned measurement, active time measurement
Step Reminder
Floor Elevation Measurement
Digital Compass:
Measurement range: 0° to 359°
16-direction display
Auto level correction
Altimeter:
Measuring range: -700 to 10,000 m (or -2,300 to 32,800 ft.)
Display range: -10,000 to 10,000 m (or -32,800 to 32,800 ft.)
Measuring unit: 1 m (or 5 ft.)
Measuring interval: 2 minutes / 5 seconds
Altitude differential measurement: -3,000 to 3,000 m (or -9,840 to 9,840 ft.)
Altitude graph
Barometric Pressure Measurement:
Measuring range: 260 to 1,100 hPa (or 7.65 to 32.45 inHg)
Display range: 260 to 1,100 hPa (or 7.65 to 32.45 inHg)
Measuring unit: 1 hPa (or 0.05 inHg)
Auto measurement interval: 2 hours
Barometric pressure graph
Barometric pressure change indicator
Temperature Measurement:
Measurement range: -10.0 to 60.0℃ (or 14.0 to 140.0℉)
Display range: -10.0 to 60.0℃ (or 14.0 to 140.0℉)
Display unit: 0.1℃ (0.2℉)
Smartphone Link/App Connectivity Features
Smartphone Link feature
Mobile link (Automatic connection, wireless linking using Bluetooth®)
Apps
CASIO WATCHES
App connectivity feature
Auto time adjustment
Easy watch setting
Time Zone setting
Approximately 300 world time cities
Notification function (incoming calls, incoming e-mails, new social media posts, calendar notifications, reminders)
Training analysis data
Activity history
Life log data
Sleep analysis data
Tide graph setting (approximately 3,300 global points)
Phone finder
Exterior
Glass
Mineral Glass
Compatible band size
145 to 215 mm
Watch Features
World time
World time
38 time zones* (38 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching
*May be updated when connected to a smartphone.
Moon data
Moon data (moon age of the specific data, moon phase)
Tide graph
Tide graph
Sunrise/sunset display
Sunrise, sunset time display
Sunrise time and sunset time for specific date
Stopwatch
1-second stopwatch
Measuring capacity: 999:59'59.9''
Measuring modes: Elapsed time, split time
Timer
Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1-second increments)
Alarm/hourly time signal
4 daily alarms with snooze
Smart alarm (with snooze)
Light
LED backlight (Super Illuminator)
Full auto LED light, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
Light
LED backlight (Super Illuminator)
Full auto LED light, selectable illumination duration (1.5 seconds or 5 seconds), afterglow
Light color
LED:White
Calendar
Full auto-calendar (to year 2099)
Mute feature
Button operation tone on/off
Energy saving feature
Power Saving (Turns off the display when the watch is left in the dark)
Battery display/alert
Battery level indicator
Run time
Approx. battery operating time:
6 months on rechargeable battery (operation period with normal use without exposure to light after full charge)
26 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Accuracy
Accuracy: ±15 seconds per month (with no signal calibration)
Other features
Using activity functions (GPS, heart rate):
• HIGH RATE (continuous reception): Approx. 14 hours max.
• NORMAL (continuous reception): Approx. 16 hours max.
• LONG (intermittent reception): Approx. 19 hours max.
Using in watch mode with heart rate measurement OFF: Approx. 2 months
Using with power-saving function ON: Approx. 23 months
* Varies depending on usage environment; from full charge, without solar power.
Accuracy
Accuracy: ±15 seconds per month (with no GPS signal reception and mobile link function)
Other features
Airplane mode
Vibrator
12/24-hour format
Regular timekeeping:
Hour, minute, second, am/pm, month, date, day
Vibration on/off
Sensor feature details
* The blood oxygen level measurement function is not intended as a medical device for diagnosing specific diseases. It is intended for general health maintenance only.
Features:
Eye-catching contrast: Vibrant rescue yellow
Vivid yellow stands out as a signature color in the design, inspired by rescue vehicles and emergency gear. This high-visibility hue is engineered for optimal contrast in poor visibility, harsh weather, and extreme conditions. Rescue yellow accents on the band and top bezel deliver a powerful, professional look. The addition of black and gray IP-finished metal components adds texture and reinforces the rugged aesthetic — a bold, functional design built for mission-ready performance.
6 sensors + GPS functionality
Built to endure — the GPRH1000RY features a shock-, dust-, and mud-resistant structure, with six integrated sensors including a heart rate monitor. GPS functionality measures position, distance, and movement speed. Supports tracking across nine activity modes, including trekking.
Details:
Attention to materials: Bio-based resin
TMajor resin components in the case, band, and other parts are made with bio-based resin, a renewable material derived from organic resources. This eco-conscious innovation helps reduce environmental impact while maintaining the ruggedness G-SHOCK is known for.
Solar-powered timekeeping with Bluetooth® connectivity or radio control for enhanced accuracy and reliability
GPRH1000RY: Bluetooth® and solar-assisted charging
Super Illuminator (high-brightness LED light) for clear visibility in low-light conditions
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