7x50mm Digital Marine Features a built-in 3-axis digital compass for true heading. Built to withstand extreme nautical enfironments. And float in them. The U.S. Coast Guard suggests you keep them on board, but we made our Marine series binoculars buoyant, waterproof and corrosion resistant, so a little dunking won"t deep-six your day. You"ll appreciate the ultra-bright, crisp views granted by their multi-coated optics and premium BaK-4 prism glass. Rugged rubber armoring provides a sure grip, absorbs shock and keeps them from sliding in rough conditions. They"re essential equipment if you spend much time on deck, and aren"t fazed by a little time off it.