What does a prolonged blast of sound signal indicate?

A prolonged blast of sound signal indicates that a vessel intends to leave the dock or is preparing to take action that may affect other vessels in the area. This auditory signal is a way to communicate with other boaters, ensuring that they are aware of the vessel's intentions, especially in situations where visibility may be impaired.

Such sound signals are part of the navigational rules established to promote safety on the water. When a vessel makes a prolonged sound, it serves as a warning or notification to nearby boats that they should be alert and take necessary precautions. It is important for all boaters to understand these signals to avoid misunderstandings that could lead to accidents.