Under what condition can a vessel cross a narrow channel or fairway?

A vessel may cross a narrow channel or fairway under the condition that it does not impede the passage of a vessel that must navigate safely within that channel. This principle is essential in maritime navigation to ensure safe and efficient movement through constrained areas, where channel depth, width, and traffic density can create hazardous conditions.

When a vessel is operating in a narrow channel, other vessels that are required to navigate within that channel have specific rights and obligations to ensure safety and prevent collisions. Therefore, any crossing vessel must be mindful of its impact on those vessels that have navigational necessity within the channel. This includes ensuring that its movements do not disrupt the safe passage of vessels, particularly those constrained by draft or other navigational challenges.

The other choices do not align with the regulations. The presence of nearby vessels is not the only factor to consider, as a crossing vessel must specifically take care not to impede the passage of others. A vessel's size is also irrelevant; being larger does not grant the authority to interfere with smaller vessels’ safe navigation. Finally, maintaining speed through the channel without regard for other traffic or conditions does not prioritize safety and is not a valid reason to cross. Therefore, the correct answer emphasizes the responsibility for safe navigation and the obligation to avoid imp