Bushnell 7x50 Marine w/Illuminated Compass & Rangefinding Reticle Binoculars

Built with the mariner in mind!Bushnell 7x50 Marine binoculars with compass and range-finding reticle are standard equipment for boating sailing hunting and nearly any outdoor activity. They deliver clear images in even the foulest weather conditions from fog rain and ice to saltwater spray. Built to withstand extreme nautical environments and float in them! We suggest you keep them onboard but the 7x50 Marine binoculars are buoyant waterproof and corrosion-resistant so they can take a little dunking. You’ll appreciate the ultra-bright crisp views granted by their multi-coated optics and premium BaK-4 prism glass. Rugged rubber armoring provides a sure grip absorbs shock and keeps them from sliding in rough conditions. They’re essential equipment if you spend much time on deck and aren’t fazed by a little time off it. Key Features100% waterproof100% fog-proofSink-proof (they float)BaK-4 Porro Prisms for bright clear crisp viewingFully multi-coated optics for superior light transmission and brightnessO-Ring sealed and nitrogen-purged to keep out moistureHighly resistant to saltwater corrosionNon-slip non-skid rubber armor cushions bumps and shock preventing sliding and provides a firm grip when wetHermetically sealedFold-down eyecupsAdvanced Nautical FeaturesThe perfect binocular for sailors and outdoor lovers the Bushnell 7x50 Marine offers a liquid-filled compass built into the viewing optics. Compass swing stops immediately due to advanced damping design and bearings are marked out in easy-to-read precise one-degree increments making the instrument ideal for shipboard navigation or locating objects accurately. A range-finding scale allows the viewer to estimate the range of objects to a known size.The Bushnell Marine 7x50 Binocular is fully shock-protected with sure-grip rubber armoring and has roll-down eyecups for use with eyeglasses. Optics include fully multi-coated lenses for excellent light transmission. The Bushnell Marine comes with rugged nylon case and neck strap and it’s built to last backed by a lifetime limited warranty.Using the CompassThe compass is a precision unit. It has extremely fast damping so there is almost no “swing” and is corrected for dip (Latitude). Compass scale is in one-degree increments and is aligned with the vertical range finding scale. Compass users should always know the local variation between magnetic and true north in order to navigate accurately. Using the Rangefinding Reticle Scale The vertical scale (reticle) visible through the left half of the binocular above the compass display allows calculation of distance to an object if its height is known or calculation of height if its distance is known. Each mark on the vertical scale has a value of 5 MIL (1MIL is equivalent to an angle that can determine an object one meter in height at a distance of 1000 meters). Thus if a navigation chart gives the height of an object by sighting on it and counting the number of MILs in the reticle you can determine its distance. Here are the pertinent formulas: To measure distance when the height is known: [Objective Height (m) / Scale Reading] X 1000m = Distance in Meters. To measure object height when the distance is known: [Distance (m) X Scale Reading] / 1000 = Object Height in Meters.