The compass is a simple, safe system used for expeditions, youth organizations, mountain guiding, orienteering and other indispensable systems in the world of navigators. So, I know where I am on the map. How do I move forward? 1, on the map write A - B is the forward direction of two points straight line, with a large disk on the arrow head to the destination B direction, the needle disk side parallel A --- B forward direction two points straight line. 2. Turn the red arrow at the bottom of the movable turntable, and then overlap with the movable compass N. Combine a direction. 3, now officially forward, every time you turn the overall disk, the activity of the carousel in the bottom of the red arrow and the activity of the compass N words. The red arrow at the bottom of the carousel and the N word of the movable compass coincide in one direction, so the arrow on the carousel is always in the direction you want to move forward. direction, always the direction of their own to move forward