Question 3895 Deck General

The correct answer is A) to avoid the effects of bank cushion and bank suction. In a narrow channel, the vessel's proximity to the bank can create bank cushion and bank suction effects, which can adversely affect the vessel's maneuverability. Bank cushion occurs when the vessel's displacement causes the water to be compressed between the vessel and the bank, making it harder for the vessel to change course. Bank suction occurs when the water accelerates along the bank, creating a low-pressure area that pulls the vessel towards the bank. To avoid these effects, the pilot may choose to keep the vessel in the middle of the channel where these phenomena are less pronounced. The other options are incorrect because they do not directly address the specific navigation challenges posed by bank cushion and bank suction in a narrow channel.