When is a sailboat under navigation rules?

A sailboat is considered under navigation rules when it is underway, meaning it is not anchored, aground, or made fast to the shore. Under these conditions, the vessel is subject to the International Regulations for Preventing Collisions at Sea (COLREGs) or local navigation rules. This includes adherence to right-of-way rules, signaling, and safe operating procedures to avoid collisions with other vessels. Additionally, a sailboat is under navigation rules regardless of whether its sails are in use or if it is being propelled by an engine.