Question 674 Rules of the Road

The correct answer is D) black cone. According to the International and Inland Navigation Rules, a sailing vessel of 20 meters or more in length that is being propelled by machinery during the day must exhibit a black cone, point up, as the shape signal. This is specified in Rule 25(c) of the Navigation Rules. The other answer choices are incorrect because a black diamond is not a recognized shape signal, a basket is not a recognized shape, and a black ball is the shape signal for a vessel at anchor, not a vessel being propelled by machinery.