BOTH INTERNATIONAL & INLAND You are in charge of a 120 meter power-driven vessel at anchor in fog, sounding the required anchor signals. You hear the fog signal of a vessel underway off your port bow. Which signal may you sound to give warning of your position?

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

Rule 35(h) allows a vessel at anchor to sound a warning signal of one short, one prolonged, and one short blast to give warning of her position and the possibility of collision to an approaching vessel. This is a discretionary signal used to supplement standard anchor signals.