When a sea anchor for a lifeboat is rigged properly, what does it help prevent?

When a sea anchor is rigged properly on a lifeboat, it primarily helps prevent broaching. Broaching occurs when a boat turns sideways to the waves, which can cause the vessel to roll uncontrollably and possibly capsize. By deploying a sea anchor, the lifeboat is stabilized, keeping the bow pointed into the oncoming waves. This alignment helps maintain control over the vessel’s movement and reduces the risk of it being overwhelmed by the water, thereby enhancing the safety of those on board.

While a sea anchor can also contribute to reducing the likelihood of capsizing, dragging, or sinking, its most direct and significant function is in preventing broaching, which can lead to loss of stability during rough weather conditions.