What is the function of frapping lines on a lifeboat?

The function of frapping lines on a lifeboat is to reduce the swinging of the lifeboat at the embarkation level. These lines are typically used to secure the lifeboat to the embarkation deck and minimize any lateral movement caused by wind or sea conditions, allowing for safer boarding and disembarkation. By keeping the lifeboat stable, frapping lines enhance the safety of those getting into or out of the lifeboat, especially during rough weather or when the ship is rolling. This stabilization is crucial in maintaining control and ensuring that passengers or crew can enter or exit the lifeboat without the risk of tipping or falling overboard.

Choosing other options would not align with the specific role that frapping lines play in lifeboat operations. For instance, while maintaining a lifeboat's buoyancy is fundamental, it is not the primary function of frapping lines. Additionally, while they may help in some aspects of guiding the boat, their primary purpose does not include speed enhancement or navigation under adverse conditions.