The steel has a beautiful glossy luster

You can program in your UTC offset and lunitidal interval to get an accurate display of tides; quite useful if you're doing shore diving, fishing, or surfing.There's no English translation for the 3184 module yet, but I would assume that the five alarms function like those in the recent G-Rescue, with snooze, 1-month, monthly, daily, etc. One interesting design choice is the buttons.The caseback itself is DLC-coated stainless with a robotic frog graphic that shows an unexpected amount of humor for a multinational corporation. The steel has a beautiful glossy luster, and is flawless in finish; a very good use of DLC, in my opinion. The case and strap design share asymmetry: the case shape is mirrored in the tapering strap all the way down to the one-sided taper at the very end. Nicely consistent.In use, the Frogman excelled as we expect from a G-Shock: high-quality LCD, easy to use software, loud alarms, and no problems with radio-set. As functional watches go, G-Shocks are hard to beat.If you're a serious diver, then the Frogman is easy to recommend. If you just appreciate gear, you might want to try one on before buying as the size and weight might not work for all wrists. In terms of value, the DLC treatment is still relatively new and quite costly, so $725 list is actually one of the less-expensive watches using it. Those on the right are large, grooved, and easy to press. The ones on the left are circular, DLC-coated, and deeply inset into shrouds. Seems that the start/stop and light buttons on the right are intended to be used underwater, but the mode/set buttons are not. If so, a thoughtful touch.(Casio also mirrored the buttons on the left -- those small polished circles of metal are decorative.) You can also see that the case is lighter in back, with matching dark grey screws. Nice attention to details.