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MASTER OF G - AIR
GRAVITYMASTER
NEW05/2024
An organic form inspired by next-generation aircraft is expressed.
Layer Guard with a fusion of different materials
Coloration evoking the look of a co*ckpit
Back engraving
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The sky’s the limit! Introducing the GRAVITYMASTER GRB300, a piece of aviation-inspired professional gear designed to work even in the harshest environments, from the G-SHOCK MASTER of G line.The GRB300 features a Carbon Core Guard structure, which delivers the shock-resistance, rigidity, and corrosion-resistance of carbon material used in aircraft fuselages. The carbon fiber-reinforced resin case and the seamless bezel design inspired by next-generation aircraft come together in a bold and powerful form. Envision the world through a pilot’s eyes with the flight log memory function for recording current location and time, as well as dual-time simultaneously displaying the time in two time zones. In addition, simply tap on the app to instantly switch between the time back home and local time — a practical function to make traveling abroad that much smoother.Large, dimensional index marks and a metal bezel accentuating the large watch face exude functionality, enhancing the visibility that is so important for pilots, whose job demands intuitive reading of time.The rotary disc indicator at the 9 o’clock position uses a dual-coil motor to ensure smooth rotation and functional beauty. The indicator not only rotates to display alarm on/off and stopwatch; it functions as a battery level indicator as well.The high-contrast black and white color scheme dotted with color accents on the dial and buttons evokes the look of a co*ckpit instrument panel, while dark color variations express the practical functionality of an aviation worldview.Key resin components used in the case, bezel, and band are made with bio-based resin, a material expected to help reduce environmental impact.
An organic form inspired by next-generation aircraft is expressed.
Layer Guard with a fusion of different materials
Coloration evoking the look of a co*ckpit
Back engraving
Shock resistant
20 bar water resistant
Keeps yourself in time
Stable solar power
Easy to operate via smartphone
Specifications
Case size (L× W× H)
59 × 54.7 × 15.7 mm
Weight
71 g
Case and bezel material
Carbon / Bio-based resin
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 feature
Mobile link (Wireless linking using Bluetooth®)
Apps
CASIO WATCHES
App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Phone finder
Glass
Mineral Glass
Crown
Screw Lock Crown
Compatible band size
145 to 215 mm
Other
Neobrite
World time
Dual time (Home City time swapping)
Stopwatch
1-second stopwatchMeasuring capacity: 23:59'59.Measuring modes: Elapsed time, split time
Timer
Countdown timerMeasuring unit: 1 secondCountdown range: 24 hoursCountdown 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)
Operation Guide (Opens in a new tab)
MOVIES
PRODUCT MOVIE
PROMOTION MOVIE
FEATURES
Seamless design offering functional beauty
An organic form inspired by next-generation aircraft is expressed with the seamless exterior design. A sense of unity is achieved by connecting the exterior surfaces, from the case to the band, smoothly and seamlessly. This design creates a tough, cutting-edge look, seemly for a new addition to the GRAVITYMASTER line.
3D face design for enhanced readability
The large-diameter, triple-layer dial with a sense of depth ensures readability for pilots, whose job demands intuitive reading of time. In addition to large, dimensional index marks and inset dials inspired by instrument panels, the metal bezel accentuating the large watch face ensures this design exudes functionality.
Dual time: Simultaneous display of time in two cities
The main dial and inset dial simultaneously display times in two cities located in different time zones. A dedicated app makes it easy to configure world time settings. Switching between home time and world time is a snap, as well. This watch puts accurate time management just a fingertip away.
Coloration evoking the look of a co*ckpit
A high-contrast black and white color scheme enhances the visibility of the watch hands and index marks, components responsible for the most vital watch functions. Red and blue color variations are offered as well, with the red model inspired by the display color of a co*ckpit instrument panel’s nighttime illumination, and the blue, that of a head-up display (HUD). These distinctive combinations of color deliver practical functionality expressing an aviation worldview.
DETAILS
Layer Guard and Carbon Core Guard structures: Featuring innovative combinations of materials
The intricately shaped bezel employs integrated moulding and has two rings — a metal ring and a urethane ring — installed beneath it. This combination of materials gives the bezel — a structural component — a refined visual presence that embodies the intricacy and sophistication of next-generation aircraft. The case is made with carbon fibre-reinforced resin, a material delivering both strength and lightness. The side buttons have anti-slip texturing inspired by hazard warning stripe tapes, and the guards beneath the buttons have been eliminated for even better operability.
Rotary disc indicator: Offering display for multiple functions
The rotary disc indicator at the 9 o’clock position uses a dual-coil motor to ensure smooth rotation. It indicates battery level and alarm on/off status, as well as displaying motion linked to each mode.
Flight log: Helpful for flight history management
Sync the watch with a smartphone and press a button on the watch to record the current time and position on a map within the dedicated app — a useful function for managing flight logs with details including times and locations of departure and arrival. In addition, plotted data can be grouped for batch management of travel record details including points of departure, transit points, and home destinations.
*This app is currently in development, and specifications are not yet final.
Attention to materials: Bio-based resin
Key resin components used in the case, bezel, and band are made with bio-based resin. Produced using renewable organic resources, this material is expected to help reduce environmental impact.
*Graphic is included for illustrative purposes.
Solar-powered timekeeping with Bluetooth® for enhanced accuracy and reliability
Super Illuminator (high-brightness LED light) for maintaining watch readability in the dark
*Image shows the GR-B300-1A.
*The color tone of the listed products may differ from the actual product in some cases.
Support
- FAQs (Frequently Asked Questions)
- Manuals(Watches)
- iOS / Android
- Video Tutorials
- G-SHOCK International Warranty Network
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