It takes skill. If you have a good brain, you can write down the scale of the compass against the degree of the compass, and you will know the word when you see the degree later. As for the northwest stem position, it represents the real northwest on the compass, because there are 24 mountains on the compass, three of which control one divination, while the northwest belongs to the dry divination, which is in the middle, seamounts in the north and Xushan in the west. In fact, compass and compass have the same function. Forget it. Come and find a picture to help you popularize science.
Now you see it! You can trust me privately if you have any questions.