First of all, we should find an open space, where there are enough cars to turn around and we should be able to distinguish between the north and the south.

First, facing the south of the car, the car does not move. Press the small hole on the back of the compass with a toothpick or something thin (just press it once, no matter which direction it is facing), and then turn the first gear clockwise to the right twice (try to keep it at a constant speed, with the speed below 5 yards). After stopping, the front of the car points to the south, and then press the small hole to indicate the south (if it is not a guide, press it again until the guide) to flash twice. Therefore, the teaching accuracy is achieved. You can look around again. Must be accurate.