Bushnell 28-5070 Marine 7x 50mm Roof Prism Binoculars with Compass Ideal binocular for marine uses Features BaK-4 prisms and fully multi-coated optics Rugged rubber-armor coating offers non-slip grip 100 percent waterproof and fogproof; O-ring sealed and nitrogen-purged; highly resistant to saltwater corrosion Includes fold-down eyecups and built-in compass