BOTH INTERNATIONAL & INLAND In restricted visibility a towed vessel must sound a fog signal when it is __________.

Correct Answer: Option C — the last vessel in the tow and it is carrying a crew

Per Rule 35(g), a towed vessel or the last vessel of a composite tow, if manned, shall sound a fog signal of one prolonged followed by three short blasts, provided it carries an active crew capable of performing safety duties.