What is the difference between a pilot and a helmsman?

The pilot is a person who easily takes the wrong route when a ship enters a strange port because it is unfamiliar with the berth. A ship is not as easy to turn around as a car, and sometimes once it makes a mistake, it cannot be corrected for two days. In order to avoid such "accidents", before the ship enters the port, the port sends a pilot on board to guide the ship. This person only tells the direction of the ship and does not specifically control the ship. The helmsman is directly responsible for the direction of the ship. The boat is a stick connected to the rudder, and is controlled by the boss of the ship himself. The ship's steering wheel moves the underwater steering surface through a chain. The person at the helm is usually the first mate (first mate) or the second mate (second mate), and the captain only gives orders, such as "Left 15" or "Left 15" or "Left 15" or "Left 15" Full right rudder" and "forward two".