What is the primary responsibility of a vessel in a narrow channel or fairway?

The primary responsibility of a vessel in a narrow channel or fairway is to keep as near to the outer limit of the channel on her starboard side as is safe. This practice is rooted in the maritime navigation rules, specifically the International Regulations for Preventing Collisions at Sea (COLREGs), which are designed to ensure safety and prevent collisions in constrained waters.

By keeping to the starboard side, a vessel reduces its risk of encountering other vessels head-on and fosters better flow in situations where vessel traffic may be heavy. This practice also allows vessels to pass more safely and efficiently, as it generally keeps the channel more open for those traveling in the opposite direction or those needing to maneuvers within the channel.

Maintaining the speed limit of the channel is important, but it is secondary to the need for safe positioning within the channel. Going to the center of the channel could cause issues with other vessels navigating the same area, especially if the channel isn't wide enough for two vessels to pass safely. While avoiding crossing the channel may be prudent under certain circumstances, it is not a blanket responsibility; there may be situations where crossing is necessary to proceed safely. Thus, understanding the appropriate positioning and navigation rules is essential for a safe maritime operation.