🔍 Key Concepts
• Navigation Rules Rule 25 – Sailing Vessels Underway and Vessels Under Oars
• The special day shape used when a sailing vessel is also using mechanical propulsion (motor-sailing)
• The meanings of the shapes shown: ball, diamond, and two cones apexes together
💭 Think About
• When a sailboat turns on its engine, is it still treated as a sailing vessel or as a power-driven vessel under the Rules? How does Rule 25 describe this?
• Which single-cone shape (and orientation) is associated with a sailing vessel using its engine, and which shape is instead used for fishing or towing?
• Look at each option: which ones clearly represent other vessel types (e.g., at anchor, towing, fishing), so they cannot be correct for a motor-sailing vessel?
✅ Before You Answer
• From Rule 25, confirm that a sailing vessel using machinery must show a cone in the forepart of the vessel.
• Identify which option shows a single cone (not two cones, not a ball, not a diamond).
• Make sure you do not pick the day shapes used for: a vessel at anchor (single ball), a vessel towing (diamond for length of tow), or a vessel engaged in fishing (two cones apexes together).