Which signal indicates that a vessel intends to proceed in reverse?

The signal that indicates a vessel intends to proceed in reverse is represented by three short blasts. This specific signal is part of the rules for signaling intentions between vessels to enhance navigational safety. According to the International Regulations for Preventing Collisions at Sea (COLREGs), three short blasts clearly communicate to nearby vessels that the vessel is moving astern, allowing others to take necessary precautions to avoid collisions.

The other signals have distinct meanings that relate to different maneuvers. For example, one long blast typically signifies that a vessel is about to leave a dock or berth, which is different from indicating that the vessel is reversing. Understanding these signals is crucial for safe maritime navigation and communication.