BOTH INTERNATIONAL & INLAND You are at anchor in fog on a 120-meter power- driven vessel. You hear the fog signal of a vessel approaching off your port bow. You may sound __________.

Correct Answer: Option C — one short, one prolonged, and one short blast

Rule 35(i) authorizes a vessel at anchor to sound an optional warning signal consisting of three successive blasts—one short, one prolonged, and one short—to give warning of its position and potential collision to an approaching vessel.