BOTH INTERNATIONAL & INLAND A fog signal of one short, one prolonged, and one short blast may be sounded by which vessel?

Correct Answer: Option A — A vessel at anchor

Rule 35(g) authorizes a vessel at anchor to sound an optional 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 provides an additional layer of safety beyond the mandatory rapid bell ringing.