Which piece of equipment is essential for a lifeguard during a rescue in deeper water?

A rescue buoy is essential for a lifeguard during a rescue in deeper water because it provides a means of flotation for the victim and assists the lifeguard in reaching and stabilizing the person in distress. The buoy allows the lifeguard to extend their reach while maintaining their own safety, as it can be thrown to the victim or used to provide support in the water. This equipment is specifically designed to help with rescues in situations where a lifeguard may be unable to reach a struggling swimmer directly, particularly in deeper areas where the risk of drowning is heightened.

While other equipment like a life vest can help with buoyancy, the rescue buoy is specifically tailored for rescue scenarios. A whistle serves as a signaling device, and a first aid kit is important for post-rescue care, but neither provides the immediate flotation and support needed in deeper water rescues. Therefore, the rescue buoy is the most critical piece of equipment in this context.