Is the usage of a fog horn indicated as necessary in low visibility situations?

Using a fog horn in low visibility situations is indeed necessary as it serves to alert other vessels of your presence and intentions. In conditions where visibility is reduced due to fog, rain, or other environmental factors, sound signals become crucial for safety. The fog horn emits a loud and distinctive sound that can be heard over distances where visual identification is not possible. This is especially important in preventing collisions, as vessels may be navigating in close proximity without being able to see each other.

International maritime regulations recommend the use of sound signals, such as a fog horn, to indicate a vessel's position. This is in line with the safety measures established under the International Regulations for Preventing Collisions at Sea (COLREGs), which emphasize the importance of communication to maintain safety in maritime navigation. Therefore, using a fog horn is not just advisable but a critical component of operating safely in low visibility conditions.