Helmsman

A helmsman is a person who steers a ship and many types of boats. In the merchant marine, this is usually an able seaman. In the Marines, it is a seaman or a quartermaster.

In the series, the only known helmsman of any crew is Jesus Burgess of the Blackbeard Pirates. The Straw Hat Pirates do not have an official helmsman, though the most common people seen steering the ship is either Nami, Usopp or Chopper in his human form. However, Franky and Sanji have been seen steering the Thousand Sunny many times. Jinbe also has some skill at steering a ship.