Want to see at sea? Well these babies will help no end. The Nexus Eterna Navigators are 7x50, which is officially the best magnification for marine use. They are waterproof and nitrogen gas purged to make them more buoyant than they were originally designed to be. They have coated lenses and a built in compass so you know where you are and where you’re looking. They have a really good head strap and they look cool. And at £229 they are a dream Christmas gift for any marine boy. Available from Allspars.