According to the passing ship effect, what should vessel A do to minimize time alongside vessel B?

• A. Decrease speed
• B. Increase speed
• C. Change course to the left
• D. Change course to the right

Answer: (B)

To minimize the time alongside vessel B, increasing speed is the appropriate action according to the passing ship effect. This phenomenon occurs when two vessels are in close proximity to each other, and one vessel's motion influences the perceived motion of the other. By increasing speed, vessel A can decrease the duration that it remains in close quarters with vessel B. This is particularly important for maintaining safe distances and ensuring navigational safety as vessels pass each other.

When vessels are close together, it is crucial to manage their speeds to avoid collisions and to reduce the potentially hazardous interactions caused by the passing ship effect. In contrast, decreasing speed would prolong the time the vessels are alongside each other, potentially increasing the risk of close-quarters situations. Changing course, either to the left or right, may also be actions that could be considered in different contexts, but to specifically minimize the time spent alongside another vessel, increasing speed is the most effective response.