When is it permissible to use the engine of a sailing vessel?

Using the engine of a sailing vessel when sailing under challenging conditions is permissible because it provides an additional means of propulsion and control. Situations such as strong winds, rough waters, or changing weather may make relying solely on sails impractical or unsafe. Engaging the engine can help maintain a safe course, improve maneuverability, or provide power to navigate through particularly difficult scenarios, which is crucial for ensuring the safety of the vessel and crew.

Other options may seem reasonable but do not fully encompass the versatility required in sailing. For example, limiting engine use only to docking would hinder the vessel's ability to respond to unforeseen circumstances while at sea. Similarly, restricting engine use solely to emergencies could lead to dangerous situations where proactive navigation is necessary. Utilizing the engine during maintenance in dry dock is also relevant, but it doesn't pertain to the operational status of the vessel on the water. Therefore, using the engine when sailing under challenging conditions presents a more comprehensive understanding of safe boating practices.