What is indicated by one short blast when two vessels are navigating?

One short blast is used in maritime communication to indicate the intention to pass another vessel on the starboard side. This signaling is part of the International Regulations for Preventing Collisions at Sea (COLREGS), which establish standard sound signals to prevent misunderstandings between vessels.

When a vessel sounds one short blast, it communicates that the vessel intends to maneuver in a way that the other vessel should expect it to pass on its right side, or starboard side. This is crucial for maintaining safety and avoiding potential collisions, as it informs the other vessel of the maneuvering intentions, allowing both vessels to navigate safely and efficiently.

Understanding these sound signals is vital for any mariner, as it enhances situational awareness and promotes safe vessel operation on the water. Thus, the significance of one short blast is firmly established as an intention to pass on the starboard side of another vessel.