and they were numbered accordingly. The "Sailing Master" was a naval officer trained in and responsible for the navigation of a sailing vessel. The rank can be equated to a professional seaman and specialist in navigation, rather than as a military commander and was originally a warrant officer who ranked with, but after, the lieutenants and was eventually renamed to "navigating lieutenant" in 1867. The Captain of Marines was the commissioned officer in command of the Royal Marines on the ship. The Purser was the officer responsible for all administrative duties and ship's supplies, such as food and drink, clothing, bedding, candles. The purser was originally known as "the clerk of burser". Pursers received no pay but were entitled to profits made through their business activities. In the 18th century a purser would buy his warrant for £65 and was required to post sureties totalling £2,100 with the Admiralty. They maintained and sailed the ships and were the standing officers of the navy, staying with the ships in port between voyages as caretakers supervising repairs and refitting. The Surgeon was the medical officer of the ship. Surgeons were ranked by the Navy Board based on their training and social status. Surgeons were wardroom warrant officers with a high status, billeted along with the other officers in the wardroom. Surgeons were assisted by surgeon's mates, who after 1805 were called "assistant surgeons". The surgeon and his mates were assisted by boys, who were called "loblolly boys", named after the gruel commonly served in the sick bay.[7] A small number of doctors with a prestigious medical education were ranked as physicians; they would supervise surgeons on ships or run hospitals on shore. The Chaplain led the ship's religious services. As an ordained minister, his social status meant he was made an officer. Standing officers The Gunner was the warrant officer in charge of the ship's naval artillery and other weapons. He supervised the Armourer, the Gunners mate and the Yeoman of the Powder room. The Boatswain (/ˈboʊsən/), bo's'n, bos'n, or bosun, was the warrant officer of the deck department. As deck crew foreman, the boatswain planned the day's work and assigned tasks to the deck crew. As work was completed, the boatswain checked the completed work was done correctly. He supervised the Ropemaker, the Boatswain's mate and the Sailmaker. The carpenter was the warrant officer who was responsible for the maintenance and