In a crossing situation, if the other vessel does not maneuver, what should the stand-on vessel consider doing?

Answer: A — The stand-on vessel may need to take action to avoid collision.

In a crossing situation the vessel with the stand-on duty should keep its course and speed, but that duty does not prevent taking action if the other vessel does not maneuver and a risk of collision remains. If it becomes clear the other vessel isn’t altering course or speed, you must take action to avoid a collision, using a safe and well‑considered maneuver with enough sea room. This means you assess the situation and, as needed, adjust course or speed to stay well clear. Simply continuing on course isn’t appropriate when a risk exists, and stopping immediately isn’t practical or required. The exact maneuver depends on the situation, but the principle is that avoidance action may be necessary when the other vessel doesn’t maneuver.