Multifunctional Compass Portable Metal Compass For Hiking Camping Climbing Material: zinc alloy, aluminum alloy Size: about 8.5*5.4cm/3.34*2.12 in Uses: Determination of azimuth, distance, level, slope (pitch angle), altitude, inter-vehicle speed and mapping simple map Composition: compass, odometer Instructions: 1. Measure the direction of the southeast and northwest: open the compass. Make the azimuth indicator “△” to “〇”; Rotate the compass. After the north end of the magnetic needle is aligned with the "〇", the direction pointed at this time is the north, and the direction of the east, south, west, and north can be directly read on the azimuth glass; Calibrate the map orientation; Measuring the magnetic azimuth; 2, measuring distance: Use the survey ruler to directly measure the distance on the map; Use the mileage to measure the distance on the map; Use a distance estimator to roughly determine the distance of the local aims; 3. Marching time and speed calculation. 4, The height of the measurement aims. Maintenance and maintenance of the instrument: Do not place the instrument near ferromagnetic materials to avoid loss of magnetic properties; It is not possible to hit the object with the ruler to avoid affecting the measurement accuracy; Do not bend the mirror so as not to affect the aiming and reading division. Keep the surface clean and not wipe it with dirty cloth or hands. The instrument should be turned off when not in use. Put it in the box. Be careful not to collide.