FROM TOP LEFT: Oris's limited-edition Carlos Coste—named after the record-setting Venezuelan freediver—is water-resistant down to a ludicrously deep 3,281 feet ($3,195; oriswatches.com). Casio's G-Shock Ana-Digi has everything you'd expect—stopwatch, four daily alarms, LCD backlight, and half a dozen other handy features—in a much more refined package ($150; gshock.com). With date, month, and moon-phase subdials, the oversize face of Ernst Benz's ChronoLunar keeps track of it all ($4,700; ernstbenz.com). Tissot's T-Navigator 3000 has three different date-reading options, and, with just a touch of the finger, its heat-sensitive face can display the time wherever you're heading next ($595; tissot.ch). Rolex makes flashier watches, but our favorite is the Oyster Perpetual Explorer II. Like the decidedly unfussy 1953 original, it's waterproof and, thanks to its corrosion-resistant stainless steel, practically indestructible ($5,000; rolex.com).
FROM TOP RIGHT: The large, luminescent hands on Breitling's Superocean Heritage are easy to read, even in murky water. And bright light isn't a problem, either: The slightly cambered sapphire crystal is completely glareproof ($3,120; breitling.com). Forget bells and whistles. Cartier's Santos 100 is a traditional, trustworthy Roman-numeral watch designed to be passed on for generations ($5,450; cartier.com). True to its name, Sector's Dive Master really is an underwater champ: In addition to all the dive features you'd expect, it also has a depth meter, thermometer, and backlight ($450; sectorgroupusa.com).