BOTH INTERNATIONAL & INLAND You are the stand-on vessel in a crossing situation. If you think the give-way vessel is NOT taking sufficient action to avoid collision, which action(s) are you required to take?

Correct Answer: Option B — Sound the danger signal

Rule 34(d) requires that if a vessel is in doubt as to whether sufficient action is being taken by the other vessel to avoid collision, it shall indicate such doubt by sounding at least five short and rapid blasts. This is the mandatory signal to alert the other vessel of danger.