The marine environment is rough on equipment. When it comes to optics, a pair of binoculars that might work great for hunting could get trashed onboard a boat, especially in saltwater. But good optics are as important at sea as in the mountains. From common navigation tasks like locating channel markers to spotting gulls diving over bait balls, you need a binocular that won’t fall apart under the demands of safe boating or run-and-gun fishing. Here are a few traits to look for in a dedicated marine binocular.