What action should smaller vessels take in a narrow channel when larger vessels are present?

In a narrow channel, the rule is that smaller vessels should yield to larger vessels to ensure safe navigation and avoid collisions. This is based on the understanding that larger vessels have more difficulty maneuvering due to their size and draft, particularly in confined spaces. When smaller vessels yield, they create a safer environment by allowing the larger vessels to navigate without obstruction, which is essential for maintaining the flow of traffic within the channel.

This concept is deeply embedded in the COLREGs, which emphasizes the responsibilities of vessels in relation to their size and ability to maneuver. By yielding to larger vessels, smaller vessels not only comply with maritime regulations but also uphold the principles of safe navigation, ensuring that the risk of accidents is minimized.

The other options, such as maintaining a constant course, changing course unpredictably, or speeding up, do not align with safe navigation practices. Maintaining a steady course could lead to a dangerous situation if a larger vessel is trying to pass. Unpredictable maneuvers can confuse other vessels and increase the risk of collisions. Lastly, speeding up in a narrow channel may lead to loss of control and does not guarantee a safe passage for either vessel.