At what interval should fog signals be sounded?

Fog signals should be sounded at regular intervals to alert nearby vessels of your presence in conditions of reduced visibility. The standard practice is to sound the signal every 2 minutes. This frequency is established to ensure that other mariners can effectively hear and recognize the signal, allowing them to take necessary precautions to avoid collisions or dangerous situations.

This 2-minute interval strikes a balance between being frequent enough to maintain awareness among other vessels, while also preventing auditory overload. In low-visibility conditions, maintaining clear communication through sound signals is crucial, as visual cues are often unavailable or compromised.

In other contexts, while it's vital to assess the situation and sound signals 'only when necessary', using a consistent interval like every 2 minutes provides a predictable rhythm that enhances safety at sea during fog or similar conditions.