A sea anchor is primarily used to prevent what?

A sea anchor is primarily used to prevent broaching, which is when a vessel turns sideways to the waves and winds, causing it to roll heavily and potentially capsize. By deploying a sea anchor, a vessel can maintain a more controlled heading into the oncoming waves, thereby reducing the chances of broaching.

Broaching can be particularly dangerous in rough seas because it can lead to the yacht or vessel rolling too far, potentially resulting in a loss of control or capsizing. The sea anchor acts as a stabilizing device, allowing the bow of the vessel to face the waves while slowing down the drift and providing some control when the vessel is at anchor in turbulent waters.

Other options, such as preventing drifting or swaying, may also be benefits, but the primary function of a sea anchor focuses on maintaining the vessel's orientation to help prevent broaching in challenging sea conditions.