What sound signal is used to indicate "let go"?

The correct sound signal to indicate "let go" is two prolonged and five short blasts. This particular signal is part of the International Code of Signals and is used in maritime communication to convey specific intentions or actions between vessels.

In this context, the use of two prolonged blasts followed by five short blasts serves as a clear and standardized acknowledgment or instruction, ensuring that all parties are aware of the command to let go, typically referring to the release of lines or anchors. This specific signal reduces confusion on the water, where visual communication may be hindered by distance or poor visibility, thus reinforcing safety and coordination among vessels.

Other sound signals serve different purposes; for example, a long blast might indicate a different action or alert, while short blasts often signal man overboard situations or other maneuvers. Understanding these sound signals is crucial for safe maritime operations.