What is the function of engaging the rudder when maneuvering a ship?

Engaging the rudder is essential for controlling the direction of the ship during maneuvering. The rudder serves as a primary tool for altering the vessel's heading; when the rudder is turned, it creates water displacement that results in a change of direction. This directional control is crucial for navigating safe passage through waters, steering through narrow channels, or executing turns. While engaging the rudder can have an indirect effect on speed—such as when the vessel’s speed decreases during sharp turns or increases during straight navigation—the primary and most significant function of the rudder is to enable the navigator to steer the ship effectively.

In contrast to the other options, adjusting the anchor depth pertains to anchoring operations rather than the maneuvering process. The communication function is about signaling to other vessels or receiving information, which is not related to the physical control of the ship. Additionally, signaling distress involves using specific communication protocols and tools, typically via radios or visual signals, and is unrelated to the rudder's function during ship maneuvering.