BOTH INTERNATIONAL & INLAND Which vessel must have a gong, or other equipment which will make the sound of a gong?

Correct Answer: Option B — Any vessel over 100 meters

Rule 33(a) explicitly mandates that any vessel 100 meters or more in length must carry a whistle, a bell, and a gong. The gong must be placed on the vessel so that its sound is clearly audible forward of the vessel, providing a distinct signal for larger vessels in restricted visibility.