When is it appropriate for a vessel to reduce its speed in a narrow channel?

Reducing speed in a narrow channel is primarily governed by the need to navigate safely in confined spaces and to avoid collisions with other vessels. When other vessels are nearby, reducing speed allows for better maneuverability and the ability to react to the movements of those vessels. This practice enhances safety and minimizes the risk of accidents in areas where space is limited and hazards are heightened.

Although there are other scenarios where reducing speed might be relevant—like avoiding grounding in shallows or in compromised visibility—the specific focus of the question pertains to interactions with other vessels. In narrow channels, the presence of other vessels is a critical factor in determining navigational decisions, and accordingly, reducing speed is a key strategy when it comes to ensuring safe passage for all vessels involved.

In summary, reducing speed in narrow channels when other vessels are nearby is essential for safe navigation, allowing for better assessment of the situation and response to potential risks.