What does one short blast indicate when two vessels are meeting?

One short blast when two vessels are meeting indicates that the vessel sounding the blast intends to pass on the port side of the other vessel. This signaling is based on the International Regulations for Preventing Collisions at Sea (COLREGs), specifically Rule 34, which addresses the actions of vessels meeting in narrow channels or when approaching each other.

When a vessel emits one short blast, it communicates a clear maneuvering intention that both vessels can understand, promoting safe navigation and preventing potential collisions. This method of signaling complements the general convention that smaller vessels, or those to the right, have a responsibility to keep out of the way of larger vessels.

Understanding this rule is crucial for any mariner, as it emphasizes the importance of communication on the water, ensuring that all parties involved are aware of the intended course of action. Proper interpretation of these signals helps maintain safety and navigational order in busy waters.