What is the function of a sea anchor?

The function of a sea anchor is to slow down the drift of a vessel by using a cone-shaped bag that is deployed into the water. When a sea anchor is deployed, it creates resistance against the movement of the vessel caused by wind and water currents. This resistance helps to stabilize the vessel, allowing it to maintain a more controlled position.

In situations where a vessel is experiencing rough weather or heavy winds, the sea anchor can prevent the vessel from being pushed off course, which is especially critical for safety during emergencies or in survival situations. This deployment allows for better management of the vessel's orientation and minimizes the chance of capsizing or being pushed towards hazards.

The other options focus on different aspects of vessel handling. While buoyancy, navigation, and positioning for rescue operations are important, they do not accurately describe the primary purpose of a sea anchor, which is fundamentally about controlling drift rather than providing buoyancy or being a stable point for rescues. Thus, the cone-shaped bag used to slow down wind drift is the essential characteristic that defines the function of a sea anchor.