Question 918 Rules of the Road

The correct answer is C) When it is the last vessel in the tow and it is carrying a crew. According to the International and Inland Navigation Rules, a towed vessel must sound a fog signal if it is the last vessel in the tow and has a crew onboard. This is because the vessel at the end of the tow is considered the most vulnerable and needs to signal its presence to other vessels in restricted visibility. The other answer choices are incorrect, as the requirement is specifically for the last vessel in the tow that is manned, not the first vessel or any vessel regardless of its position.