The porro Prism Navigator Pro Series is the choice for recreational boaters, weekend anglers and hobby sailors. The Steiner 7x50 Navigator Pro C binocular offers exceptional performance for the price with many of the features found on premium, world-famous Steiner marine binoculars. Although not built to military specification, they will provide a Lifetime of use for most water enthusiasts. These binoculars carry an HD fluid-damped, illuminated Analog compass for easy-to-read navigation. The 7x magnification is the marine standard, with a wide, stable image for tracking other boats, Buoys and bridge numbers even in rough water. Featuring high contrast optics provides bright, sharply contoured Images with natural color definition for outstanding viewing quality suitable for both beginners and professionals. The floating Prism system uses flexible Silicon lens mount to absorb severe shock, impact and abuse without damage. Also included is the sports-auto focus system, which lets you focus each eyepiece to your vision once, then keeps Images razor sharp from 20 yards to Infinity. No more chasing focus on moving objects. The makrolon house is durable polycarbonate with NBR long life rubber armoring, creating a lightweight, rugged chassis that withstands 11 GS of impact. That makes this binocular impervious to harsh conditions for generations of trusted use. The N2 injection system seals 14-psi pressurized dry Nitrogen into the optic, for fog proof clarity in any condition- from artic cold to Desert heat.