Final answer:
The rescuer uses the bridge of the nose as a guide when placing the pocket mask on the victim's face.
Step-by-step explanation:
When placing the pocket mask on the victim's face, the rescuer uses the bridge of the nose as a guide for correct position. The pocket mask is a device used in CPR to provide a barrier between the rescuer and the victim's face during rescue breaths. By placing the mask over the victim's nose, the rescuer ensures a proper seal and delivers the breaths effectively.