Navis Imperialis - Specialist Ranks: Tech-Priest Majoris (Enginseer Prime) - The Tech-Priest Majoris is the Adeptus Mechanicus representative on a warship's bridge crew and is responsible for communicating the needs of the Mechanicus to the Captain and his officers.Principle Navigator (Warp Guide) - The Principle Navigator is the senior-most Navigator on a warship who has the terrible responsibility of charting a passage through the Warp and bringing the starship through unharmed.Chief Astropath - A Chief Astropath is the senior Astropath aboard a warship and has direct dealings with the Captain. He or she is responsible for ensuring that the warship's Astropathic Choirs are able to maintain adequate long-range communications.Master Gunner - The Master Gunner is a high-ranking Warrant Officer given responsibility for the maintenance and performance of the warship's macrobatteries and Lances. He or she is also responsible for ammunition storage and power linkages.Master of Ordnance - A Master of Ordnance is responsible for managing torpedoes and Attack Craft such as huge starbombers, lumbering assault boats and agile fighters carried within a warship's vast launch bays. The Master of Ordnance coordinates the efforts of the deck crews to ensure everything is fuelled, armed and ready to launch at a moment's notice.Master of Arms - The Master of Arms, also called the Master-At-Arms, is charged with ensuring that all weaponry on board a warship is serviceable and ready for action, from the greatest macrocannon to the meanest Stub Pistol. The Sergeants-At-Arms report directly to the Master of Arms, and by extension all Armsmen are under his or her control, and so they also perform a role akin to that of a chief of police aboard ship. The Master of Arms is normally appointed from among the commissioned officers on a ship but more rarely a senior Warrant Officer may hold this position.Ship's Surgeon - Also called the Chief Chirurgeon or unofficially, "Sawbones," the Ship's Surgeon is charged with administrating and maintaining the medicae facilities aboard the vessel. A Ship's Surgeon's duties include combating disease and malnutrition among the crew as well as suturing flesh and setting bones.Officer of the Watch - The Officer of the Watch draws up duty rosters, assigns watches and attends the warship's chronometers. On most Imperial Navy starships the title of Officer of the Watch is rotated through the ranking commissioned officers. On older vessels it tends to become a permanent position assigned to the officer that has served the longest time aboard a vessel.Fleet Commissar - Like their Imperial Guard counterparts, Commissars are appointed to the fleets of the Imperial Navy. Working closely with the ship's Master of Arms, the Fleet Commissar ensures a warship is kept battle-ready at all times and that the crew remains focused on their duty to the Emperor. A Fleet Commissar has the authority to declare a Captain or even an entire crew unfit for service if he or she is sufficiently concerned about their actions or the state of their ship. At least one Fleet Commissar will normally be aboard any capital ship. In the case of Escort squadrons a Fleet Commissar will divide his time between the different vessels in the squadron in a series of snap inspections and drills.Ship's Confessor - A Ship's Confessor is a vessel's Ecclesiarchy representative who works tirelessly to promote the Imperial Creed among the crew and weed out potential Heretics. In these duties the Confessor is usually assigned by lay-preachers chosen from the most faithful on the lower decks. This is particularly essential on large warships as it allows the Confessor to concentrate his or her efforts on the warship's officers, shriving and chastising them as required, reminding them of their duties to the God-Emperor loudly and often.