What is the purpose of boatslings in a hoisting operation?

The purpose of boatslings in a hoisting operation is to provide support to the boat during lifting. Boatslings are specially designed straps or harnesses that cradle the hull of a boat, ensuring that it is securely held in place as it is lifted, typically by a crane or hoist. This support is crucial to prevent damage to the boat and to maintain its structural integrity during the lifting process. Proper use of boatslings helps distribute the weight of the boat evenly and reduces the risk of tipping or shifting, which could lead to accidents or injury.

The other options do not accurately represent the function of boatslings. While keeping a vessel afloat is important, it is not the role of boatslings, as they are used during hoisting rather than while a boat is in the water. Lowering sails or securing cargo involves different equipment and procedures that are unrelated to the specific purpose of boatslings.