BOTH INTERNATIONAL & INLAND A vessel 50 meters in length at anchor must sound which fog signal?

Correct Answer: Option D — 5-second ringing of a bell every minute

Rule 35(g) requires a vessel at anchor to ring the bell rapidly for about five seconds at intervals of not more than one minute. For vessels 100 meters or more in length, a gong must also be sounded in the forepart of the vessel immediately after the bell.