Question 169Navigation General

The correct answer is B. Under the IALA-A Buoyage System, when entering from seaward, a lateral system buoy to be left to port may display a topmark of two black cones, point-up. This is depicted in illustration D046NG, option B. The other options are incorrect because: A shows a single black cone, which would indicate a buoy to be passed on the starboard side; C shows two black cones, point-down, which would indicate a buoy to be passed on the starboard side; and D shows a single black cylinder, which is not a standard topmark under the IALA-A system.