🔍 Key Concepts

• Rule 25 – Sailing Vessels Underway and Vessels Under Oars in the Navigation Rules • The special requirement for a vessel that is under sail and also using its engine (sailing vessel vs. power-driven vessel status) • Day shapes and what each one generally indicates (ball, cone, two cones apex together, basket)

💭 Think About

• Ask yourself: When a sailboat is ALSO using its engine, is it legally treated as a sailing vessel or a power-driven vessel for the Rules of the Road? • Which day shape is used to show that a sailing vessel is actually being propelled by machinery as well? • Look at the options and recall what each of these shapes usually indicates in other contexts (e.g., fishing, not under command, aground, etc.). Which one matches a sailing vessel using its engine?

✅ Before You Answer

• Verify in Rule 25(e) what shape is prescribed for a sailing vessel also being propelled by machinery. • Make sure the length condition (15 meters or more) is met, since this affects whether the shape is required or only optional. • Confirm that the shape you choose is specifically associated with sail plus machinery, not with other situations like fishing, constrained by draft, or vessel at anchor.