What does 1 black ball indicate?

The presence of one black ball signifies that the vessel is at anchor. According to the International Regulations for Preventing Collisions at Sea (COLREGs), a vessel at anchor must display certain signals to indicate its status to other vessels and ensure safety on the water. The black ball is a specific shape that communicates this information clearly.

When a vessel is at anchor, it is crucial for other vessels nearby to be aware of its position to avoid collisions, especially in congested waters. The use of this sound signal is part of the signals to be used by vessels to indicate their status and is consistent with the principles of maritime navigation that promote safety.

In contrast, a black ball does not convey that the vessel is aground, under command, or towing another vessel, which are represented by different shapes and signals in maritime practice. Understanding these signals is essential for maintaining navigational safety and preventing misunderstandings between vessels.