INTERNATIONAL ONLY Which vessel would NOT sound a fog signal of one prolonged and two short blasts?

Correct Answer: Option D — A vessel being towed

COLREG Rule 35(g) mandates that a manned vessel being towed sounds one prolonged and three short blasts. Conversely, sailing vessels, vessels constrained by their draft, and vessels not under command sound one prolonged and two short blasts under Rule 35(c).