Question 162Navigation General

The correct answer is B. Under the IALA Buoyage system, a buoy showing an uninterrupted quick-flashing white light in the North Sea area would be fitted with topmark B, which is a double cone with the points upward. This configuration indicates that the buoy is marking the port (left) side of a channel when entering from the sea. The other topmark options are incorrect because A is a single cone point upward (starboard side), C is a single cone point downward (preferred channel), and D is a double cone with the points downward (starboard side).