What sound signal means that the operator is putting the vessel's rudder right?

The signal that indicates the operator is putting the vessel's rudder to the right is indeed represented by one short blast. In maritime signaling, particularly under the International Regulations for Preventing Collisions at Sea (COLREGs), one short blast of the whistle is used to communicate the intention to change course to starboard, which means turning the rudder to the right. This sound signal is a crucial part of navigation and communication between vessels, ensuring that other operators are aware of maneuvers being executed, thereby promoting safety and reducing the risk of collisions. Understanding these sound signals is vital for anyone involved in maritime operations to navigate effectively and responsibly.