What phrase is used to instruct the helmsman to align the rudder with the keel of the ship?

The phrase "Rudder amidships" is used to instruct the helmsman to align the rudder with the keel of the ship, essentially bringing the rudder to a neutral position. In this position, the rudder is straight, allowing the vessel to travel in a straight line without any directional bias imposed by the rudder. This is an essential command for executing turns or navigating more complex maneuvers when it is needed to stabilize and maintain the ship's course.

When the rudder is amidships, it helps to improve the hydrodynamic efficiency of the vessel by minimizing drag and preventing unnecessary sideways movement. This is particularly important in situations where the vessel needs to be guided smoothly, such as entering port or navigating tight spaces, ensuring safe and effective handling.

Other choices like "Rudder full starboard" and "Hard to port" instruct the helmsman to turn the rudder to the right or left, respectively, and "Steady as she goes" is a command to maintain the current course rather than providing specific rudder positioning. Each command serves distinct navigational purposes, but "Rudder amidships" specifically indicates the neutral alignment of the rudder.