Second master

Second master is a military rank used in multiple Francophone navies across the world as well as a former rating in the Royal Navy.

United Kingdom

Second master was introduced in 1753 and indicated a deputy master on third-rate ships of the line or larger.
Second masters were paid significantly more than master's mates, £5 5s per month. A second master was generally a master's mate who had passed his examination for master and was deemed worthy of being master of a vessel. Second masters were given the first opportunity for master vacancies as they occurred.
Master's mates also acted as second master of vessels too small to be allocated a warranted master.