What is the appropriate fog signal for a vessel at anchor with a bell?

A vessel at anchor is required to use specific sound signals to alert nearby vessels of its presence, especially in reduced visibility conditions such as fog. The appropriate fog signal for a vessel at anchor is to ring a bell once every minute.

This practice is established to ensure safety on the water, as it helps other vessels determine where an anchored vessel is located without relying solely on visual cues. The one ring every minute is a clear and consistent signal that indicates the presence of an anchored vessel, giving enough time interval for other mariners to discern the sound amidst other environmental noises.

Using two rings every minute or one ring every three minutes does not align with the standards set for sound signals in these conditions. The chosen answer provides the right frequency and clarity needed for effective communication on the water.