Question 212Navigation General

The correct answer is D. Under the IALA-B Buoyage System, a lateral system buoy to be left to port when entering from seaward may display the topmark shown in illustration D046NG, which is a single black cylinder. This topmark indicates that the buoy should be passed to the port side when entering from the seaward direction. The other answer choices are incorrect because they do not represent the proper topmark for a port-hand buoy under the IALA-B system. Options A, B, and C depict different topmark configurations that would not be used for this type of buoy.