The carbon fiber bezel is made with a carbon fiber sheet inserted into the fine resin. The top fine resin layer is transparent which allows the the carbon fiber to be visible. When paired with a smartphone, your watch automatically adjusts the time, and records mission logs, using altitude data from the watch and GPS data from the smartphone. Official Casio Description. From the MASTER OF G Series MUDMASTER, the watch that is designed and engineered to withstand rough land environments, come carbon resin models that incorporate a new type of structure.

A built-in air pressure sensor measures ambient air pressure and presents this on a display to indicate weather patterns, Display range: 260 to 1,100 hPa (7.6 to 32.5 inHg), Display unit: 1 hPa (0.1 inHg), Pressure tendency graph: Changes in air pressure are represented on the watch face in the form of a graphLED light for the face (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) The watch can act as a GMT world timer watch with 38 timezones including pilots UTC universal time. It also comes with a sunrise and sunset indicator which is very useful when out on trails. Stopwatch Others: Relative altitude readings (±100 m /±1000 m), selectable measurement interval: 5 seconds or 2 minutes (1 second for first 3 minutes only) What we like in GG-B100 *comments by experts with 10years experience in writing about Casio watches For the tactical professional or serious enthusiast, the GWG1000-1A1 is tough to beat. It comes with Multi-Band 6 Atomic Timekeeping and Triple Sensor capabilities (altimeter/barometer, compass, and thermometer), ensuring that you're never off-course. The Vibration Resistant Structure adds an extra layer of durability, especially for those in seismic research fields or construction.

Technological Prowess: Loaded with features like atomic timekeeping, solar power options, and world time, these watches are as smart as they are tough. The watch features a double LED light which is surprisingly powerful but only stays on for a 3 second burst. The hands of the watch also have lume applied so they remain visible for a long period during the night even without using the LED light to read the time. Bluetooth Connectivity Function-wise, this model comes with compass, altimeter/barometer, temperature reader and pedometer. In addition to being able to easily correct the time using the dedicated CASIO WATCHES app, there are lots of other useful features including the Mission Log feature, which automatically records in the app altitude data obtained from the watch and route data obtained by your smartphone. Phone Finder: Pressing a button on the watch will emit an audible tone from your phone, even in silent mode., Signal Range: Up to 2m (may differ depending on surrounding conditions), The watch can be wirelessly connected to a compatible smartphone or tablet via Bluetooth. The energy-saving technology enables access to a host of functions.The Height Gain function sums all meters climbed in a session to show the total ascent during a tour.

Step count (A built-in 3-axis acceleration sensor begins counting steps the moment you start to walk.) The compass might be the best feature on this watch. When you press the top right button you get the seconds hand now pointing north for you AND a digital readout in bearing degrees for the direction you are currently facing. You can also change this readout to a NSEW readout rather than a specific bearing. The watch also allows you to drop a virtual pin on a location and then have the watch indicate direction for you to return to that location later. Battery 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.Casio state that the watch has a +/- 15 seconds per month. I find with many Japanese manufacturers they understate their accuracy and given that the watch synchs with your app you’ll usually always have total accuracy for the current time wherever you are. Size and Fit Part of the specialist Master of G series designed for use in the most extreme conditions, our new GG-B100 watches feature the all-new Carbon Core Guard case, with a dust and mud-resistant structure that can withstand harsh land environments. Sunrise and Sunset times are displayed for your chosen location. Ideal for planning outdoor activities. Update (June 2019): Casio Europe now has the GG-B100 models listed. Other info and features not previously mentioned include:

A built-in temperature sensor measures the ambient temperature around the watch and displays it on the LCD, Measuring range: -10°C to 60°C (14°F to 140°F); measuring unit: 0.1°C (0.2°F) Best characteristic of watch: Excellent mix of form and function. New case construction and materials are clear upgrade. Legible, attractive dial. Enjoyable to use interface and functions. Step counter adds way for consumer to engage with the watch.Countdown start time setting range: 1 second to 24 hours (1-minute increments and 1-hour increments) The thermometer gives you an accurate read of the current temperature which again you can customize in the app for Celsius or Fahrenheit. Measuring Capacity: 24 hours, Measuring Modes: Elapsed time, split time, 1st-2nd place times, Measuring Unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Daily Alarms: Each will sound every day at the time you set, Hourly time signal: The watch beeps every hour on the hour The Dial has hands that are reminiscent of the military dive watches with sword shaped hour hands and arrow point seconds hands that pay homage to the Omega and Rolex military watches of the 1960s to 2000s.