Characteristics
Master of G series watches are invariably amongst the largest G-Shock designs Casio produces, usually suited for those with larger wrists. They almost always named with a "man" suffix, after the initial Frogman model which itself was named for scuba divers. Three models, the Mudman, Gaussman and Raysman all feature a thick rubber outer layer that surrounds the buttons and case completely, ensuring they offer mud-resistance. The Gaussman was also ISO-certified anti-magnetic.
Most models consist of a steel case surrounded by a thick neoprene or polyurethane bezel and outer protection. All models except the earliest Frogmen feature Casio's Illuminator display lighting system and are water resistant to 20 atmospheres (20bar/200metres), and are thus suitable for scuba-diving except at depths requiring helium-oxygen gas.
Some of the modules incorporate highly advanced functions. The Riseman featured twin sensors that measured both temperature and atmospheric pressure, thus allowing it to serve as a barometer and altimeter. The Raysman was the first model to make use of Tough Solar technology to power its functions, the Wademan featured a digital compass, the Fisherman helped introduce the now-common tide graph and moonphase readouts, and the Antman was the first watch Casio made that received an atomic signal that calibrated its timekeeping with atomic clock transponders in Japan.
Today, it is not unusual for two or more of these features to be found in a single Master of G model i.e. the current GW-9200 Riseman has Tough Solar to power its radio-calibrated timekeeping and thermometer/altimeter/barometer functions; the GWF-1000 Frogman and GW-9110 Gulfman both feature solar power, radio timekeeping and tide and moon phase indicators. The current Mudman, designated as the GW-9300, has one of the most extensive feature sets by far, with mud/dust resistance, solar power, radio timekeeping, moon phase display, thermometer and digital compass functions.
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