What sound signal is used by a safe water mark?

The safe water mark is designed to indicate that there is clear water all around the buoy, meaning vessels can safely navigate in its vicinity. The sound signal associated with a safe water mark is a single long blast. This sound signal is used to differentiate it from other buoy types and signals, ensuring that mariners can easily recognize and understand the navigational information being conveyed.

In maritime practice, the single long blast serves as a clear indicator that no navigational hazards are present, reinforcing the purpose of safe water marks. This is crucial for ensuring the safety of vessels in potentially busy or tricky waterways where clarity of information is essential for safe passage. The long blast also helps attract attention, making it clear to mariners that they are entering a safe area.

Other sound signals, such as short blasts or multiple long blasts, are reserved for different buoy types or navigational scenarios, providing distinct cues based on the characteristics and requirements of those specific markers.