🔍 Key Concepts

• Rule 25 – Sailing Vessels and Vessels Under Oars (Navigation Rules) • The definition of a power-driven vessel versus a sailing vessel when an engine is in use • The day shape used to indicate a vessel is under sail and power at the same time

💭 Think About

• Ask yourself: When a sailboat has its engine running and propeller engaged, how is it classified under the Rules – as a sailing vessel, a power-driven vessel, or something else? • Think about what lights or shapes, if any, are prescribed specifically for a sailboat that is also using its engine at the same time. • Consider whether the stand-on/give-way responsibilities change when a sailing vessel is also using its engine.

✅ Before You Answer

• Verify in Rule 25 what the Rules say about a vessel under sail when also being propelled by machinery. • Check which day shape (if any) is required for a vessel under sail and power (look for a black cone, apex down). • Confirm whether a vessel under both sail and power may still claim the rights of a sailing vessel in a crossing or overtaking situation.