BOTH INTERNATIONAL & INLAND While underway in fog, you hear the rapid ringing of a bell for about five seconds followed by the sounding of a gong for about five seconds. This signal came from which vessel?

Correct Answer: Option A — A vessel 150 meters in length at anchor

Rule 35(g) requires that a vessel of 100 meters or more in length at anchor shall sound the bell for five seconds forward, followed by the gong for five seconds aft. This signal is specifically intended to alert other vessels to the presence of a large vessel at anchor.