What is the role of the “stand-on” vessel in a crossing with a given risk of collision?

• A. Immediately alter course to avoid.
• B. Maintain course and speed unless the other vessel fails to take action; if risk remains, the stand-on vessel may take action to avoid.
• C. Stop and reverse engines immediately.
• D. Hail the other vessel for intent before acting.

Answer: (B)

In a crossing situation, the stand-on vessel keeps its course and speed to maintain predictability and give the other vessel a clear chance to avoid. Only if the give-way vessel fails to take appropriate action, or if the risk of collision remains after observing its actions, should the stand-on vessel take action to avoid. This action should be taken in a way that still avoids creating another risk and typically involves adjusting speed or course as needed. Immediate alteration of course, stop-and-reverse, or hailing for intent aren’t required or appropriate first steps under this rule. Therefore, maintaining course and speed unless the other vessel does not act is the correct approach.