Skillful use of compass

The compass can not only indicate from east to west and from north to south, but also tell you the distance to the target.

When designing and manufacturing the compass, the factory has already considered the problem of measuring distance with it. Open the compass and you will immediately find a scene and a door. The width of the tips on both sides of the quasi-constellation is exactly one tenth of the distance from the quasi-constellation to the light gate. Quasi-constellation estimates the decision distance, so it is called "distance estimator".

When measuring the distance, put the compass flat, observe the target through the door and sight with your right eye, remember the width of the light spot with the distance estimator, and then visually observe the width of the light spot and multiply it by 10, which is the distance to the target. If the target is too narrow, you can also aim at half of the evaluator, so multiply it by 20.

For example, the measured enemy tank is about half of the estimated amount, and it is known that the enemy tank is about 7 meters long, so the distance to the tank can be calculated as: 7 meters ×20= 140 meters.