Steiner Navigator Pro 7x50 Binoculars with Compass 7x Magnification is the marine standard with a wide, stable image for tracking other boats, buoys and bridge numbers even in rough water High Contrast Optics provide bright, sharply contoured images with natural color definition for outstanding viewing quality suitable for both beginners and professionals Floating Prism System uses flexible silicone lens mount to absorb severe shock, impact and abuse without damage Sports-Auto Focus System lets you focus each eyepiece to your vision once, then keeps images razor sharp from 20 yards to infinity Makrolon housing is durable polycarbonate with NBR Long Life rubber armoring, creating a lightweight, rugged chassis that withstands 11 Gs of impact