Does anyone know how to measure distance with a compass

There are two ways to measure distance with a compass.

One is calculated using geographic and geomagnetic declinations.

The other is to determine the latitude and longitude by measuring the sun, date, and time, and calculating the angle of the shadow length.

I haven't played compass ranging, only compass ranging

How to measure the distance with a compass:

1. Use a surveying ruler to directly measure the distance on the map.

2. Use the mileage meter to read the distance on the map.

1 First put the red pointer to "0";

2) Hold the instrument flat, place the odometer wheel lightly on the starting point, and roll forward to the end point along the measured route;

3) According to the engraved line pointed by the pointer on the scale bar, the corresponding field distance can be read directly. For example, on the 1:50000 map, measure from point A to point B, and the instrument dial is l; The 50,000 scale refers to 14 carved lines, so the physical distance between the two points of A and B is 7 kilometers.

If 14 lines are measured on the L:100000 map, the distance between points A and B is 14 kilometers. In addition, with a corresponding proportion (e.g., 1:

25,000) or multiples (e.g. 1:20000 and l 500,000) can also be read in converted quantities.

3. Use a distance estimator to roughly determine the distance of the local targetThe distance between the two tips of the distance estimator on the instrument is l 10 of the distance between the target and the front sight, and the distance to the target on the spot can be determined by using a similar triangular relationship.

l) Knowing the distance between two targets (objects) and the point, the following formula can be used to find the interval between these two targets (objects):

Distance between two targets The distance between two targets and the standing point is 1 10

Turn on the instrument, aim at the target with your eyes close to the point, if the two targets (objects) happen to be clamped by the two tips of the distance estimator (as shown in Figure 2), and it is known that the distance between the two target points and the point is 100 meters, then the interval between the two target points is 100x1 10 = 10 meters, and the rest can be calculated according to this method.

In addition, the following formula can be used when the distance between two objects in front of the object does not necessarily happen to be clamped between the two tips of the distance estimator, and the boy may be greater than the distance between them:

The distance between the two target points The distance between the two targets and the point x 1 10 x the multiple of the two tips occupied by the two targets.

For example, if the distance between the two targets and the standing point is known to be 100 meters, and the distance between the two targets is measured to be 7 10 meters from the distance between the two tips of the estimator, then the distance between the two targets is 100 1 10 7 10 7 meters. Similarly, if the distance between the two targets is 1 5 times the distance between the two tips of the estimator, the distance between the two targets is 100 x 1 m.

2) The width of a known object or the distance between two targets, and the distance between the target and the point where it is located, can be calculated by the following formula:

Distance between target and standpoint: 10 interval between known targets

For example, if it is known that the distance between the target C in front is 12 meters, which is exactly illuminated by the two tips of the distance estimator, the distance between the target point and the standing point is 12 10 120 meters.

In addition, the interval between the targets is known, but when aiming, it is less or greater than the interval between the two tips of the distance estimator, the following formula can be used:

Distance from target to location = (actual distance between target x 10) The multiple of the target to the distance between the two tips of the distance estimator.

Note: The method of measuring the distance of the local target with the distance estimator is simple, but the accuracy is not high.