What does one short blast communicate regarding course alteration?

One short blast is a sound signal that is used to communicate a specific intention regarding course alteration. When a vessel makes one short blast, it indicates that the vessel is altering course to starboard. This is a standard signal under the COLREGs, which are the international regulations governing the conduct of vessels at sea. The purpose of this signal is to inform other vessels of the intended maneuver, thereby helping to avoid collisions and ensuring safe navigation.

Understanding the significance of sound signals is essential for all mariners, as they facilitate communication in situations where visual signals may not be clear, such as in poor visibility conditions or during busy maritime traffic. By using one short blast, a vessel warns nearby vessels of its intended action, allowing them to adjust their own course or speed if necessary.