How to determine the position with a compass?

Place the compass or compass horizontally to center the bubble. When the magnetic needle is at rest, the black end marked with "N" refers to the north. In addition to measuring the true north direction, a compass or compass can also measure the specific direction of the target. The method is to aim the collimator at the target on the Cairo disk, or aim the 0 scale on the dial at the target, so that the target, the 0 scale and the magnetic midpoint are on the same line. After the compass is horizontally stationary, the scale pointed by the N end is the direction from the measuring point to the target. For example, the n end of the magnetic needle points to 36. The target is 36 east of the measuring position.

Although it is simple and quick to identify the direction with a compass or compass, you need to pay attention to: 1, and try to keep it horizontal; 2. Don't be too close to magnetic substances; 3. Don't mistake the S end of the magnetic needle for the north, resulting in the direction error of 180; 4, master the magnetic declination in the active area for correction.