Question 188Navigation General

The correct answer is A) triangular topmark. Under the IALA-A Buoyage system, a buoy marking the starboard side of the channel when approaching from seaward will have a triangular topmark. This is because starboard-hand markers in the IALA-A system are conical or can-shaped buoys with a triangular topmark, which helps seafarers quickly identify the side of the channel. The other options are incorrect because a red light (B) is used for port-hand markers, a can shape (C) is for starboard-hand markers, and an isophase light (D) is a type of light characteristic not specific to the IALA-A buoyage system.