BOTH INTERNATIONAL & INLAND Your vessel is at anchor in fog. The fog signal of another vessel, apparently underway, has been growing louder and the danger of collision appears to exist. In addition to your fog signal, what signal may be used to indicate your presence?

Question

Accepted Answer

Option D: One short, one prolonged, and one short whistle blast. Under Rule 30, an anchored vessel exhibits an all-round white light forward (and aft if 50m+) by night, and one black ball forward by day.