In a crossing situation, when may the stand-on vessel take action to avoid a collision?

In a crossing situation, the stand-on vessel typically has the responsibility to maintain its course and speed. However, when it becomes apparent that the give-way vessel is not taking appropriate action to avoid a collision, the stand-on vessel may choose to take evasive measures. This is crucial for ensuring safety and preventing potential collisions.

If the give-way vessel fails to take the necessary steps to avoid a dangerous situation, the stand-on vessel must take the initiative to prevent an accident. This follows the principle that safety is paramount, and even the stand-on vessel must act if it recognizes a significant risk of collision.

The other options do not accurately reflect the rules. Signaling by the give-way vessel does not necessarily indicate that it is not taking action, and simply wishing to change course or worsening visibility does not justify action by the stand-on vessel. The key factor here is the clear understanding that the stand-on vessel must react when it is evident that the give-way vessel is not fulfilling its duty to avoid a collision.