INTERNATIONAL ONLY You are operating a vessel in a narrow channel. Your vessel must stay within the channel to be navigated safely. Another vessel is crossing your course from starboard to port, and you are in doubt as to his intentions. According to Rule 9, you __________.

Correct Answer: Option C — may sound the danger signal

International Rule 34(d) and Rule 9 governing narrow channels allow a vessel in doubt regarding the intentions or actions of a crossing vessel to sound the danger signal consisting of at least five short and rapid blasts without delay.