Endurance ED Marine Binoculars 7x42 Monocular - Blue with CompassA range of optics designed specifically for marine applications.For over a decade, Endurance ED optics have been renowned for incredible performance and reliability. Now, with the introduction of the Marine range, we have expanded upon this award-winning selection with optics specifically designed for marine and boating applications.With a range of models to choose from, the Marine Optics family features binoculars and monoculars to suit any requirement.Advanced BAK-4 roof prism optical systems make far more compact, modern, and lightweight optics than the industry norm.An integrated compass allows you to pinpoint your bearing and that of any object or land.Rangefinding ReticleThe rangefinding reticle can be used to calculate the distance between you and the object you are looking at. This can be extremely important in nautical environments, assisting as a visual check and as a failsafe to on-board navigation systems.The rangefinding reticle is made up of a grid-like pattern of lines that are segmented into Milliradians, known sometimes as Mils. A milliradian is a unit of angle that can be used to calculate the distance of a known-sized object.Note: The compass is set for Northern Hemisphere latitudes (Europe and the USA), so it may appear slightly out of focus when used outside these regions.Features: Built-In Compass Rangefinder Reticle Display For Distance Calculation 7x Magnification Perfect For Marine Applications Extra-Low Dispersion (ED) Glass Phase Corrected High Resolution Phase Corrected BAK-4 Roof Prisms Twist-Up Eye Cups With Position Stops Stay-On Lens Covers Floating Wrist Strap Nitrogen purged Waterproof and Fog-proof Hawke No-Fault Lifetime Warranty Specifications: Magnification: 7x Objective Lens: 42mm Lens Coating: Fully Multi-Coated Color: Blue Optical System: System H5 Field of View (Adeg): 7.5 Eye Relief: 0.7in, 17mm Exit Pupil: 0.24", 6mm Field of View: 393ft @100yds, 131m @100m Apparent Field of View (Adeg): 53 Close Focus: 6.6ft, 2m Prism Type: Roof Prism Glass: BAK 4 Eye Cups: Twist-Up Eyecup: 1.7in, 43mm Diopter Type: Eye Piece Tripod Mounting Thread: Yes (1/4" - 20 UNC) Height: 6.3", 159mm Width: 3.1", 121 - 80mm Weight: 14.3oz, 405g