For April 2017, G-Shock presents the new Master in Marine Blue collection, an ocean-themed Master of G series comprising both Frogman and Gulfmaster models. First up is the all-black G-Shock Gulfmaster GN-1000MB-1AJF, a Twin Sensor model accented with an emerald blue second hand and subdial needle, alongside an emerald green 6 o'clock subdial. The G-Shock Frogman GWF-D1000MB-3JF is the most vibrantly hued model from the bunch, featuring a light emerald blue bezel and matching band. Features include Tough Solar/Multi-Band 6 and a Triple Sensor, as well as a water depth meter, compass, and thermometer. Finally, the G-Shock Gulfmaster GWN-Q1000MB-1AJF has a black dial and band, accented with a yellow/green IP application on the outer bezel and emerald blue on the second hand and retrograde needle. Features include Tough Solar/Multi-Band 6 and a Quad Sensor with a water depth meter, altimeter/barometer, compass and thermometer. All three models are available now through select G-Shock retailers in Japan.