A ship’s cook was the petty officer responsible with providing meals to the crew.
A cook on a ship has about the same tasks as a cook on land. His job was cooking for the crew and maybe the junior officers. The wardroom might have a steward to cook for them and the captain would almost always have a steward to prepare meals for him. As such, the cook on a large ship often didn’t have to be particularly skilled, although cooking during heavy seas would be a skill in his own right. However, during battle or a storm, all fires on board would usually be extinguished. A cook would rarely be a sailor and would therefore not be expected to perform any tasks associated with the running of the ship.
Aboard the Obra Dinn
During her last voyage, the Obra Dinn carried a cook named Thomas Sefton. He did not survive the trip.