Final answer:
The helm command 'Left Twenty' is a directive for a vessel to change its heading 20 degrees to the left or port side.
So option (A) is correct
Step-by-step explanation:
The helm command "Left Twenty" typically means to change the course 20 degrees to the left. This is not a command related to the boat's speed, nor is it strictly limited to the rudder's angle. Rather, it is an instruction for the vessel to alter its heading to the left (which is to port for someone facing forward on a ship) by 20 degrees. The direction of 'left' or 'port' in maritime terms relates to the left-hand side of a ship when looking forward from the stern towards the bow.
This means that the person giving the command is instructing the helmsman or the individual responsible for steering the vessel to turn the ship to the left by 20 degrees. The term "Left" indicates the direction of the turn, while "twenty" specifies the degree of the turn. Port refers to the left side of the vessel when facing forward.
This command is crucial for maneuvering and changing the vessel's course safely. It is a concise and standardized way of communication on a ship, ensuring clarity and precision in steering instructions. Following such commands accurately is essential for navigation, avoiding obstacles, and maintaining the overall safety and control of the vessel while at sea.