COROS VERTIX

From £519, coros.com

Built for adventurers, the Vertix covers core sports modes like running, cycling and swimming, but it also bosses more testing challenges, with altitude and mountain climb modes designed to track your ascents and keep you safe on the way to the summit. Its titanium frame and sapphire glass screen offers solid protection against any rough and tumble. This is also the only watch that’s waterproof to 150 metres and has the ability to work in freezing conditions. There’s no shortage of sensors on board, with a compass for navigation and mapping, and a pulse oximeter for added safety when you hit high altitude. There’s a heart rate monitor too, but accuracy is a bit spotty. This is also a watch that will go the distance. It promises 45 days in regular use and a massive 60 hours when you’re using GPS. Leave it on your bedside table for a few days or even weeks, and there’s still more than enough power to get you through another big adventure.