In preparation for a possible close-quarters situation in a narrow channel, what is the recommended first step?

• A. Determine the base rule and identify stand-on and give-way vessels
• B. Immediately reduce speed to zero
• C. Sound five short blasts
• D. Shift to port

Answer: (A)

The main idea is to establish who must keep their course and speed and who must maneuver. In a potential close-quarters situation in a narrow channel, the first step is to determine the applicable rule and clearly identify which vessel is the stand-on vessel and which is the give-way vessel. This lays the foundation for any subsequent action, because you can only plan a safe maneuver once you know which vessel has the obligation to maintain its course and speed and which vessel must take early and decisive action to avoid a collision. Without this, attempts to slow down, signal, or change course can create confusion or even make the situation worse.

After the roles are identified, you then decide the appropriate action in line with the rules—typically a measured adjustment in speed or a controlled maneuver to pass safely. Signals like five short blasts are reserved for warnings if there’s doubt or danger after you’ve assessed the situation, and shifting to port or other maneuvers should follow from the determined roles rather than be the first move.