What does one short blast of a horn indicate when passing another vessel?

One short blast of a horn when passing another vessel indicates the intent to pass on the port (left) side. This sound signal is part of the maritime communication system and helps in maintaining safety and awareness on the water. By signaling with one short blast, a boater is informing the other vessel of their directional intentions, which allows both parties to respond appropriately to facilitate a safe passing maneuver.

In navigating waterways, clarity in communication is vital. Therefore, when one vessel intends to overtake another, using sound signals, such as the one short blast, is essential for avoiding collisions and ensuring that both vessels have a mutual understanding of their movements. This regulation ensures that maneuvers are predictable and reduces the potential for misunderstandings in busy or restricted waterways.