Casio G-Shock GWG-100 Watches

About the Watch in short. Representative of the dirt-resistant direction of the G-Shock Mudmaster. The design of the case and buttons does not allow dust, dirt, sand and other small particles to get inside the watch, thereby making the GWG-100 even more airtight than ordinary jishoks. The cylindrical shape of the buttons and the metal of which they are made protect the buttons from shock, and the toothed texture makes pressing more convenient when using the watch with gloves. The image and appearance of the GWG-100 is borrowed from vehicles and special-purpose tools that are used by rescue teams in the disaster area. 4 separate digital windows contribute to a more detailed display of data on the dial. Special inserts on the back of the strap provide a more snug fit to the hand. Time is automatically synchronized by radio waves, and the solar battery is charged from daylight. Bright neon lights fully illuminate the dial in the dark.


Quick Content Guide

  1. Japanese approaches to Tough and Functional Watches in GWG-100 *the most distinctive features in details
  2. General information about the watch *year of first release, model range etc.
  3. G-Shock GWG-100 Display Guide *for key functions only
  4. GWG-100 Usage Patterns *what the watch is usually meant for
  5. Feedback from Users and Experts *anonymous from different sources
  6. GWG-100 Model Range *in different colors and bands
  7. The most distinctive specs *from our Editorial point of view
  8. Other G-Shock GWG Watches *similar by price and functions but different by cases
  9. G-Shock GWG-100 on the wrist! *only images and only on the wrist
  10. Official GWG-100 Specs *all details and for base version GWG-100-1A3
  11. GWG-100 Comparison Table *with similar G-Shock Watches
  12. Full Photo Gallery *various images

Enjoy Japanese approaches to Tough and Functional Watches!

*some images are about G-Shock 5000/5600 cases, but the technology, approaches, concepts and philosophy remains the same for the whole G-Shock Model Range

Solar Power. None-Stop – A solar panel converts even weak illumination from fluorescent lighting into electric power. A rechargeable battery with a large power storage capacity supports stable operation of various functions with high electricity consumption. You never have to worry about the battery running down because it’s a solar battery. Casio watches with solar technology, receive thermal and electrical energy that recharges the watch batteries through solar panels on the face of the watch.

MultiBand 6. Terrestrial radio wave reception from 6 transmission stations worldwide. Automatic time correction available in Japan, North America, UK, Europe and China.
— Reception is possible even when surrounded by buildings.
— Signals are received during the night to keep the displayed time exact. — Reception is possible with less than normal power consumption.



General Information

Price560$ *average Amazon Price, we may earn commission from purchases
Year of first Release2018
Module Number5562 / Manual
Model RangeMUDMASTER (The Mudmaster has been designed to withstand the toughest of conditions. With a digital compass, barometer, altimeter, thermometer and step tracker, you’ll reach your goal even when challenges seem insurmountable. MUDMASTER – the perfect union of toughness and technical finesse.)
Battery TypeSolar (G-Shock Batteries)
Buy Battery on Amazon →
Other Divisions the GWG-100 belongs to: *you may find all watches of the division by clicking on the linkG-Shock Ana-Digi
G-Shock Compass
G-Shock Barometer and Altimeter
G-Shock Solar

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G-Shock GWG-100 Display Guide *for key functions only. For you to know how it works))

Using the World Time Mode

You can use the World Time Mode to view the current time in one of 31 time zones (48 cities) around the globe. The city that is currently selected in the World Time Mode is called the “World Time City”.

Using the Stopwatch

The stopwatch measures elapsed time, splitmtimes, and two finishes.
To enter the Stopwatch Mode
Use C to select the Stopwatch Mode (STW)

Using the Countdown Timer

The countdown timer can be set within a range of one minute to 100 minutes. An alarm sounds when the countdown reaches zero.

Using the Alarm

You can set five independent alarms. When an alarm is turned on, an alarm tone will sound for about 10 seconds each day when the time in the Timekeeping Mode reaches the preset alarm time. This is true even if the watch is not in the Timekeeping Mode.

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GWG-100 Usage Patterns *what the watch is usually meant for

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Feedback from Users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.

PROs
+ durability
+ comfortable
+ solar atomic version of the GG-1000
+ it’s amazing. All it needed was a quad sensor.
+ the illumination system on gwg100 is incomparable. The gwg100 has that beautiful multicolor light + screen.

CONs
– expensive
– the 12 and 6 look almost too big
– no sapphire crystal
– miss the ABC functions
– no second hand
– large
– digital display is very poor. Not able to see what is there in screen. Every time u have to press light button to see

Feedback from Experts *based on comparison info with similar watches by price, model range, etc.

PROs
+ hourly Time Signal
+ very accurate. Radio-controlled (via atomic watch signals)
+ solar powered

CONs
– expensive but worth the money
– 31 time zones
– no Altimeter
– no Barometer
– no Compass
– no Step Tracker
– no Sunrise Sunset
– no Thermometer

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GWG-100 Model Range *may be updated

*You may find updated information about colors on our G-Shock 2021 New Releases page →

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The most distinctive specs of GWG-100 *Editorial
— 200-meter water resistance
(good for swimming but not for deep diving)
— Mud Resistant (helps to ensure that nothing gets into the watch when down and dirty work takes you deep into the dirt and sludge)
— Tough Solar (CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power)
— Radio-controlled Watch; Multi band 6 (additional way for time sync. This watch receives time calibration radio signals that keep the displayed time accurate)

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Other G-Shock GWG Watches *similar by price and functions but different by cases


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Official Marketing Focus from Casio

MASTER OF G Series MUDMASTER, the watch that is designed and engineered for wear and use by those whose work takes them into areas scattered with rubble, dirt, and debris, is proud to announce new models that pack solar powered operation into dirt and mud resistant configurations. The button guard cylinder structure of these models seals out mud and dust, enabling use in severe environments. Cylindrical piping protects buttons against impact and improves their operation, and gaskets inside the buttons prevent the entry of fine sand and dust particles. The rugged designs of these watches are in the image of the special purpose vehicles and tools that are used by disaster relief teams.
Wide hour and minute hands and large Arabic numeral hour markers provide easier reading under harsh conditions, and the band has a distinctive non-slip texture, rounding out a tough no-nonsense design. These new MUDMASTER models are the perfect choice for anyone who requires tough performance under tough conditions.


G-Shock GWG-100 on the wrist!

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Official GWG-100 Specs / Features *for base version GWG-100-1A3

  • Case / bezel material: Resin / Stainless steel
  • Resin Band
  • Mineral Glass
  • Neobrite
  • Shock Resistant
  • Mud Resistant
  • 200-meter water resistance
  • Double LED light
    LED light for the face (Full auto LED light, Neon illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
    LED backlight for the digital display (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  • Solar powered
  • World time
    31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping
  • 1/100-second stopwatch
    Measuring capacity: 59’59.99”
    Measuring modes: Elapsed time, split time, 1st-2nd place times
  • Countdown timer
    Measuring unit: 1 second
    Countdown range: 100 minutes
    Countdown start time setting range: 1 second to 100 minutes (1-second increments and 1-minute 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.)
  • Battery level indicator
  • Power Saving (display goes blank to save power when the watch is left in the dark)
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Button operation tone on/off
  • Regular timekeeping
    Analog: 2 hands (hour, minute (hand moves every 20 seconds))
    Digital: Hour, minute, second, pm, month, date, day
  • Accuracy: ±15 seconds per month
  • Approx. battery operating time:
    8 months on rechargeable battery (operation period with normal use without exposure to light after charge)
    19 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
  • Size of case : 56.2×54.9×17.3mm
  • Total weight : 88g

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GWG-100 Comparison Table with similar G-Shock Watches

GWG-100

Price (Amazon)

Year of first Release

2019

2017

2016

Accuracy

Bluetooth (via phone app)

Radio-controlled (via atomic watch signals)

±15 seconds per month

SmartWatch Features

G-Shock Connected App (simplifies certain watch operations by letting you perform them on your phone screen)

No

No

Light

Neobrite (hands and hour markers) Double LED light

Neobrite (hands and hour markers) Double LED light

Neobrite (hands and hour markers) and LED light (Super Illuminator)

Alarm

5 daily alarms

5 daily alarms

5 daily alarms (with 1 snooze alarm)

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)

Measuring unit: 1 second
Countdown range: 100 minutes
Countdown start time setting range: 1 second to 100 minutes (1-second increments and 1-minute increments)

Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 minute to 60 minutes (1-minute increments)

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

1/100-second stopwatch
Measuring capacity: 59’59.99”
Measuring modes: Elapsed time, split time, 1st-2nd place times

1/100-second stopwatch
Measuring capacity: 23:59'59.99''
Measuring modes: Elapsed time, split time, 1st-2nd place times

Hourly Time Signal

Yes

Yes

Yes

World Time

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

31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping

31 time zones (48 cities + coordinated universal time), daylight saving on/off

Altimeter

Yes

No

No

Barometer

Yes

No

No

Compass

Yes

No

Yes

Second Hand

Yes

No

Yes

Step Tracker

Yes

No

No

Sunrise Sunset

Yes

No

No

Thermometer

Yes

No

Yes

Case / bezel material

Carbon (Carbon Core Guard)

Resin / Stainless steel

Resin / Stainless steel

Glass

Mineral (Spherical Glass)

Mineral glass

Mineral glass

Battery

2 years on CR2025

Solar powered CTL920

2 years on SR927W

Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size

55.4×53.1×19.3

56.2×54.9×17.3

56.2×55.3×17.3


Full features (if you want to know more)

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GWG-100 Replacement Band (Strap) *availability
We think it is very important (before buying a new watch) to know if there will be some choice as for replacement bands for GWG-100 (in future or even now). So we made a research and you shouldn’t worry about your future as the bands are available for buying.

starting from 61$ on eBay →


Recent News about GWG-100 

All Casio GWG-100 News →


You ask, we answer…

What does 200-meter water resistance in GWG-100 mean?

The watch is good for swimming but not for deep diving.

How does Mud Resistant in GWG-100 work?

It helps to ensure that nothing gets into the watch when down and dirty work takes you deep into the dirt and sludge.

What does Tough Solar in GWG-100 mean?

CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power.

How does Radio-controlled Watch in GWG-100 work?

This is additional way for time sync. This watch receives time calibration radio signals that keep the displayed time accurate.


Not sure about GWG-100? There are more G-Shocks!

Back to All G-Shock Models →

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