When a vessel of less than 20m is crossing from the starboard side in a narrow channel, what action should you take?

When navigating in a narrow channel, especially with the presence of a vessel less than 20 meters crossing from the starboard side, the most prudent action is to reduce speed and keep a close lookout. This approach is in line with safe navigation practices and COLREGs regulations, which emphasize the importance of situational awareness and the need to avoid potential collisions.

By reducing speed, you allow more time for assessment of the situation and create a buffer for maneuvering. This is particularly crucial in a narrow channel where space to maneuver may be limited, and the risk of collision is higher. Keeping a close lookout ensures that you remain aware of the movements of the smaller vessel and can react promptly if necessary.

In contrast, maintaining your course without adjustment might place you in a dangerous position if the crossing vessel does not take adequate precautions or if its operator does not see you. Changing course to port could also lead to complications, especially if it unexpectedly interferes with other vessels in the channel. Sounding the horn continuously might alert others, but it does not address the immediate need to navigate safely in a constrained space. Therefore, reducing speed and maintaining vigilance is the most effective and responsible action in this scenario.