BOTH INTERNATIONAL & INLAND In the daytime, you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows which shape?
• Rule 25 – Sailing Vessels Underway and Vessels Under Oars in the Navigation Rules • Day shapes that indicate a vessel’s means of propulsion • How a sailing vessel signals that it is also using machinery (power)
• Think about what special signal is required when a sailing vessel is no longer considered a “sailing vessel” for the Rules because it is also using its engine. • Ask yourself: which of these shapes is specifically associated with a sailing vessel under power (often called “motor-sailing”)? • Consider which shapes or signals you’ve seen linked to other meanings, such as vessels at anchor or constrained by draft, and rule those out.
• Verify in Rule 25 which exact single day shape is shown by a sailing vessel when it is also being propelled by machinery. • Check that the shape you choose is shown point down (apex down) and is not a shape normally used for anchoring or other special conditions. • Confirm that only one of the answer choices matches the required day shape for a motor-sailing vessel.
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