With the lensatic compass opened wide and held level, turn it horizontally until the azimuth is directly under the black index line. Holding the compass in this position, rotate the bezel until the luminous indicator is over the N arrow of the dial. With a basic understanding of land navigation, you will be able to safely navigate your position with ease. This handheld compass is water resistant, sand proof and constructed with a powder coated aluminum frame for top endurance. Accurate to +/- 40 mils, it works impeccably time and time again. Performs perfectly in temperatures ranging from -50° F to 150° F.