8-12 Student Notes: Letter Type of Compartment Examples A Stowage spaces Store and issue rooms; refrigerated compartments AA Cargo holds Cargo holds and cargo refrigerated compartments C Control centers for ship and fire-control operations (normally manned) CIC; plotting rooms; communications centers; pilothouse; electronic equipment operating spaces; IC rooms E Engineering control centers (normally manned) Main machinery spaces; evaporator rooms; steering gear rooms; pump rooms; auxiliary machinery spaces; emergency generator rooms F Oil stowage compartments (for  ship use) Fuel- , diesel- , and lubricating-oil compartments FF Oil stowage compartments (cargo) Compartments carrying various types of oil as cargo G Gasoline stowage compartments (ship use) Gasoline tanks, cofferdams, trunks, and pump rooms GG Gasoline stowage compartments (cargo) Spaces for carrying gasoline as cargo J JP-5 fuel (ship use) Jet fuel stowage spaces JJ JP-5 fuel (cargo) Spaces for carrying JP-5 fuel as cargo K Chemicals and dangerous materials (other than oil and gasoline) Chemicals, semisafe materials, and dangerous materials carried as cargo or for ship’s use L Living spaces Berthing and messing spaces; staterooms; washrooms; heads; brig; sick bay; and passageways M Ammunition spaces Magazines; handling rooms; turrets; gun mounts; shell rooms; ready service rooms Q Miscellaneous spaces not covered by other letters Laundry; galley; pantries; wiring trunks; unmanned engineering; electrical and electronic spaces; shops; offices T Vertical access trunks Escape trunks V Voids Cofferdam spaces (other than gasoline); void wing compartments W Water stowage spaces Drainage tanks; freshwater tanks; reserve feedwater tanks Table 8-1.—Compartment Letters for Ships