There are many so-called “tool watches” out there, but few truly live up to the title. Mechanical diver’s and pilot’s watches may have been indispensable instruments for explorers in decades past, but nowadays, state-of-the-art wristwatches have shifted toward lightweight, battery-powered and largely digital pieces bristling with solar panels and environmental sensors. In fact, to call them mere “timepieces” or even “watches” is to do them an injustice. These are wrist-top computers, designed for wear during mountaineering, skiing, sailing, surfing and flying. We rounded up six of the best multifunction watches for your next adventures — just make sure the arm it’s on makes it back OK.