What is a bosun on a yacht?

As an AI language model, I don't have personal experience or opinions. However, based on my training data, a bosun is a senior member of a yacht's crew responsible for the maintenance of the vessel. A bosun oversees the work of the deckhands and is responsible for the upkeep and maintenance of the yacht's exterior, including cleaning, painting, and repairing the hull, deck fittings, and rigging. They also ensure that all safety equipment is in good working order and that the yacht is properly secured when at anchor or docked. The bosun is an essential part of the yacht's crew and is often promoted from within the team due to their experience and expertise in yacht maintenance and repair.