Commanders use hand signals:

1. Preparation

The arm should be extended flat, placed above the head, the five fingers should be naturally extended, and the palm of the hand should be kept forward (Figure 1).

2. Want main hook

Make a natural fist with one hand, place it on the head, and gently touch the head (Figure 2).

3. Want auxiliary hook

One hand clenches the fist, the forearm does not move upward, the other extends, and the palm lightly touches the front elbow joint (Figure 3).

4. Hook lifting

The forearm is extended to the upper side, the five fingers are naturally extended, higher than the shoulder, and rotate with the wrist as the axis (Figure 4).

5. Hook lowering

The arm extends to the front lower part of the side, with an angle of about 30 ° to the body. The five fingers extend naturally and rotate around the wrist (Figure 5).

6. The hook rises slightly

Extend the forearm to the upper front of the side, with the palm facing upward and higher than the shoulder, and repeatedly swing the palm upward with the wrist as the axis (Figure 6).

7. Slight drop of hook

Extend the arm to the front lower part of the side, the angle between the arm and the body is about 30 °, and swing the palm downward repeatedly with the wrist as the axis (Figure 7).

8. Lift arm

The arm is extended horizontally to one side, the thumb is upward, the rest of the fingers are closed, and the forearm swings upward (Figure 8).

9. Lower boom

The arm is extended horizontally to one side, the thumb is upward, the other fingers are clasped, and the forearm swings downward (Figure 9).

10. Swivel arm

Extend the arm horizontally, point to the direction of the arm to be rotated, extend the thumb, hold the rest of the fingers together, and rotate with the wrist as the axis (Figure 10).

11. Arm extension

Make fists with the center of the fist upward and the thumbs pointing to both sides respectively, and do the repulsive action (Figure 11).

12. Retract arm

Make a fist with the center of the fist upward and the thumb pointing at each other, and move in opposite directions (Figure 12).

13. End of work

Extend the fingers of both hands and cross them in front of the forehead (Figure 13).

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