People who work on seagoing ships are collectively called seafarers. Seafarers are divided into senior seafarers and ordinary seafarers. Seafarers engaged in management work on board are called senior seafarers, also known as cadre seafarers. Including the captain, chief engineer, first mate, second mate, third mate, big tube wheel, second tube wheel and third tube wheel. Seafarers who assist senior seafarers in certain jobs on board are called ordinary seafarers, also known as workers' seafarers.