INTERNATIONAL ONLY You are in charge of a 250-meter freight vessel constrained by her draft proceeding down a narrow channel. There is a vessel engaged in fishing on your starboard bow half a mile away. According to Rule 9, which statement is TRUE?

Correct Answer: Option C — If you are in doubt as to the fishing vessel's intentions you may sound at least five short and rapid blasts on the whistle.

Rule 9(e) states that if a vessel in a narrow channel is in doubt as to the intention of another vessel, she shall immediately signal doubt by sounding at least five short and rapid blasts on the whistle.