Illuminated Compass: Set your course and keep to it with the illuminated compass dial. Built-in Reticle: Integrated Reticle pairs with the compass to help pin-point object locations or directions. Wide Field of View: Even on rolling seas, keep objects easily in sight with this monocular wide field of view. Broad and sharp visibility: By adopting a flatten lens, we have secured a high viewing flatness and realized a wide good image range. It brings a sharp image even in the vicinity of the field of view as well as the center. Easy to peep eyepiece, high eye point: Large aperture eyepiece, eye relief 23mm high eye point specification. Even with those who wore eyeglasses as well as naked eyes by adopting a twist-up viewing mouth, it is also easy to peep.