Bushnell Marine series of binoculars was meant to be used on the high seas. These Bushnell binoculars are extremely resistant to open water hazards that would sink other binoculars. Bushnell Marine binoculars are buoyant, incredibly resistant to saltwater corrosion, and 100% waterproof. Plus, they're nitrogen sealed, so vision-obscuring fog won't get into your binoculars. Toughness isn't all the Marine series has to offer, however; Bushnell has equipped Marine binoculars with BaK-4 porro prisms and fully multi-coated optics, granting these binoculars an impressive field of view and high light transmission. navigation is even made easy by certain models of Marine by Bushnell binoculars; one model features a compass, while another has an integrated digital compass, so you'll never lose your bearings. For open ocean observation, it's hard to beat a Bushnell Marine.