Question 312Navigation General70% to pass
Under the IALA Buoyage System, which topmark shown in illustration D023NG below will be displayed on a safe watermark?
AI Explanation
The correct answer is A.
Under the IALA Buoyage System, a safe watermark will display the topmark shown in illustration D023NG, which is a single black sphere. This topmark indicates that the buoy or marker is on the safe water, meaning it is in the middle of the navigable channel or fairway.
The other options are incorrect because B is a double black sphere (indicating a bifurcation or channel junction), C is a single black cone (indicating a port-hand mark), and D is a single black cylinder (indicating a starboard-hand mark). These topmarks have different meanings and are used to mark different types of navigational features.
Related Questions
#310 In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to- starboard buoys, when fitted with lights, will show a _______________.#311 Of the four light characteristics shown in illustration D019NG below which one does NOT represent a safe water mark of the IALA Buoyage System? #313 Charts showing the coast of Mexico are produced by the United States _______________.#314 How is a safe water mark, that can be passed close aboard on either side, painted and lighted? #315 The light rhythm of Morse