Master sailor, formerly Master seaman, or matelot-chef (matc) in French, is a non-commissioned member rank of the Royal Canadian Navy, which is between sailor first class and petty officer 2nd class. Technically, the rank is actually an appointment, with appointees holding the rank of sailor first class. If demoted, a master sailor will become a sailor second class or sailor first class depending on seniority. However, the process to be appointed is very similar to that of a promotion, and holding the appointment of master sailor is a prerequisite to promotion to PO2.