Silva Black Lensatic Compass 2801020 on sale and available from our online store. OpticsPlanet, Inc is an Authorized US Distributor for Silva Compasses.
The lensatic compass is (was) the typical military field compass, and is used principally to measure or lay out magnetic bearings. It can also be used to orient a map. The "lensatic" means that the rear sight is provided with a lens that allows you to read the dial while your eye is close to the rear sight, as it should be. The lid of the compass opens up to provide a slot with a crosshair as the front sight. This crosshair is actually a sturdy metallic wire. When you sight a distant object, the magnetic bearing can be read from the dial to an accuracy of a degree or two, with care.