Seafarers are the general name of ship staff who sail at sea, and are generally divided into senior seafarers and ordinary seafarers. Senior crew members are divided into management level and operation level: management level: captain, chief engineer, first mate, second engineer, political commissar (domestic only); Operation level: second pair, second tube wheel, third pair and third tube wheel. Ordinary seafarers are also called support-level boatswain, machinist foreman, Yishui, Ershui, machinist, etc. , including chefs and clerks.