Describe a method of conserving energy at sea while waiting for rescue.

Floating on a raft or life jacket is the most effective method for conserving energy while waiting for rescue at sea. This technique allows individuals to remain buoyant without exerting unnecessary physical effort. By utilizing a raft or life jacket, survivors can avoid the fatigue that comes from swimming or treading water, which can quickly deplete energy reserves, especially in challenging conditions.

This method also minimizes exposure to the elements, as being supported by a raft or life jacket can provide some insulation from cold water and help protect against sun exposure. Remaining calm and relaxed while floating allows for better energy management, increasing the chances of survival while awaiting rescue.

Engaging in swimming or standing upright in the water, while they may seem like active responses, would actually consume significant energy and could lead to exhaustion. Scanning the horizon for boats is important for signaling and awareness but does not contribute to energy conservation directly.