Marine ready performance: 10x magnification with a 50 mm objective lens, 23 mm eye relief, 6.8 mm exit pupil, and a field of view of 396 feet at 1000 yards (132 meters at 1000 meters). Built to handle extreme conditions: completely waterproof and floats in water; nitrogenpurged for fog proofing; stable, comfortable to hold, and durable. Bright and clear optics: Porro prism system for a wide field of view; BAK4 prism with fully multicoated optics delivers bright, crisp images. Compass and rangefinder: Illuminated compass built in for direction location, with an internal rangefinder for determining distance and size of objects. Practical applications: Open water navigation and lookout on a boat, with distance estimation and direction reference. Coastal wildlife observation and birding with a wide field of view and clear optics. Shoreline scouting and distance measurement for planning routes or activities using the builtin compass and rangefinder.