G-SHOCK

GRB300RY-1A9

Archive model

This product is no longer available for purchase.

Whatever you’re doing, wherever you are — the G-SHOCK Master of G line has your back.

For total support in the harshest environments, this GRAVITYMASTER watch delivers peak performance in punishing conditions in air. It features bold black to exude toughness and a band in the same bright yellow used for emergency rescues and safety signs. This innovative design is a sure fit for the world of professionals involved in rescue efforts and other critical missions.

The organic form of the GRAVITYMASTER GR-B300RY is inspired by next-generation aircraft and rendered with a seamless exterior design. The Carbon Core Guard structure and wide 3D face deliver durability, readability, and a comfortable fit. Enjoy all the practical functions as well, including dual-time simultaneously showing the time in two cities, a flight log memory function for recording routes traveled, and more.

This tough watch delivers what you need to make quick decisions and take decisive action in the harshest of environments.

Basic Information
  • Band
    Bio-based resin band
  • Case and bezel material
    Bio-based Carbon / Bio-based resin / Stainless steel
  • Case size (L × W × H)
    59 × 54.7 × 15.7 mm
  • Construction
    Shock Resistant, Carbon Core Guard structure
  • Power supply and battery life
    Tough Solar (Solar powered)
  • Time adjustment
    Bluetooth: Connects to a smartphone and automatically adjusts the time
  • Water resistance
    200-metre water resistance
  • Weight
    71 g

Exterior
  • Compatible band size
    145 to 215 mm
  • Crown
    Screw Lock Crown
  • Glass
    Mineral Glass
  • Other
    Neobrite
  • Surface treatment
    Black ion plated bezel

Smartphone Link / App Connectivity Features
  • App connectivity feature
    Auto time adjustment, Easy watch setting, Approximately 300 world time cities, Flight log, Phone finder
  • Apps
    CASIO WATCHES
  • Smartphone link feature
    Mobile link (Wireless linking using Bluetooth®)

Features
  • Accuracy
    Accuracy: ±15 seconds per month (with no mobile link function)
  • Alarm / hourly time signal
    Daily alarm
  • Battery display alert
    Battery level indicator
  • 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)
  • Light
    LED light (Super Illuminator)
    Afterglow
  • 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)
  • 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)
  • 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)
  • World time
    Dual time (Home City time swapping)
User Manual – Module 5719

Projecting toughness and vibrance with high-impact rescue yellow

The worldview of professionals engaging in rescue missions is expressed with a vivid yellow hue conveying danger awareness. Prominently featuring this eye-catching colour, this trio of timepieces builds on GRAVITYMASTER, MUDMAN, and RANGEMAN designs from the MASTER OF G line of watches which demonstrate their true potential in extreme conditions. Standing out strikingly against solid, powerful black, the vibrant colour projects the characteristic toughness of G-SHOCK.

Eye-catching contrast: Vibrant rescue yellow

Vivid yellow is featured prominently in the watch designs as a key colour. Employed on equipment and vehicles used by rescue teams, the striking hue serves as a caution colour that powerfully projects its presence amid adverse weather conditions, poor visibility, and other demanding environments. Rescue yellow accents on parts including the band and bezel’s top create a high-impact look. Black and grey IP gives enhanced textural appeal to metal components to realise toughness-driven design fitting for professional gear.

Duplex LCD display - MUDMAN GW-9500MRY

Built with a shock-, dust-, and mud-resistant structure, the MUDMAN GW-9500MRY is equipped with Triple Sensor, which measures compass bearing, altitude/barometric pressure, and temperature. The digital compass display employs a duplex LCD for greater practical utility.

* The watches in the second image are included for illustrative purposes.

Carbon Core Guard structure, both strong and light

A carbon fibre-reinforced resin case protects the module, making the most of the high degree of strength and outstanding durability delivered by the carbon material to achieve a size ensuring a comfortable fit.

* Image shows the GRB300RY-1A9.

Attention to materials: Bio-based resin

Key resin components used in the case, band, and more are made with bio-based resin, which is produced using renewable organic resources and is expected to help reduce environmental impact.

* Image is included for illustrative purposes.

Solar-powered timekeeping with Bluetooth® connectivity or radio control for enhanced accuracy and reliability

GR-B300RY: Bluetooth®
GW-9500MRY: Radio control
GPR-H1000RY: Bluetooth® and solar-assisted charging

* Image shows the GRB300RY-1A9.

Feature List

  • Black icon of a watch hitting a flat surface with motion lines indicating a shock or impact.

    Shock resistant

  • Black icon of a person snorkeling with the number 20, representing a 20-bar pressure rating for water resistance.

    20 bar water resistant

  • Minimalist black icon of a person walking next to a simple clock face, representing punctuality or time management.

    Keeps yourself in time

  • Black icon of a smartwatch charging via solar energy with a battery level indicator and sun rays.

    Stable solar power

  • Black and white icon of a smartphone syncing time with an analog wristwatch via a wireless connection.

    Easy to operate via smartphone

Shop G-SHOCK MASTER OF G RESCUE YELLOW

Compare models

Compare key specifications across models in this collection.

G-SHOCK-GRB300RY-1A9-Watches-CASIO Australia
GRB300RY-1A9
View details
G-SHOCK-GW9500MRY-1A9-Watches-CASIO Australia
GW9500MRY-1A9
View details
G-SHOCK-GPRH1000RY-1A9-Watches-CASIO Australia
GPRH1000RY-1A9
View details
Price
Price
$649.00
$849.00
$1,199.00
Case size (L × W × H)
Case size (L × W × H)
59 × 54.7 × 15.7 mm
56.7 × 52.7 × 14.8 mm
60.6 × 53.2 × 20.3 mm
Weight
Weight
71 g
88 g
92 g
Water resistance
Water resistance
200-metre water resistance
200-metre water resistance
200-metre water resistance
Band
Band
Bio-based resin band
Bio-based resin band
Bio-based resin band
Glass
Glass
Mineral Glass
Mineral Glass
Mineral Glass
Power supply and battery life
Power supply and battery life
Tough Solar (Solar powered)
Tough Solar (Solar powered)
Charging system compatible with dedicated cable (requires device with Type-A USB terminal), Solar powered
Smartphone Link
Smartphone Link
Mobile link (Wireless linking using Bluetooth®)
—
Mobile link (Wireless linking using Bluetooth®)
Accuracy
Accuracy
Accuracy: ±15 seconds per month (with no mobile link function)
Accuracy: ±15 seconds per month (with no signal calibration)
Accuracy: ±15 seconds per month (with no GPS signal reception and mobile link function)
World time
World time
Dual time (Home City time swapping)
World time
31 time zones (48 cities + coordinated universal time), daylight saving on/off
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.
Stopwatch
Stopwatch
1-second stopwatch
Measuring capacity: 23:59'59.
Measuring modes: Elapsed time, split time
1/10-second stopwatch
Measuring capacity: 999:59'59.9''
Measuring modes: Elapsed time, split time, 1st-2nd place times
1-second stopwatch
Measuring capacity: 99:59'59''
Measuring modes: Elapsed time, split time
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