1. Stand in the middle of the room and take out your compass.
2. Then make the magnetic needle in the compass coincide with the straight line at the bottom.
Generally speaking, a better compass has two colors, the color of the magnetic needle is the same as the color of the bottom straight line, that is, the north.
For example, the color of the magnetic needle is half red and half black, and the bottom line is red. If the needles are stacked on a straight line, the red part of the needle refers to the north, while the beginning of the straight line has the word S for the south, the word N for the north, and the rest has the word W for the west and the word E for the east.
After the magnetic needles are superimposed in a straight line, the direction can also be calculated from the degree.