: (Type 140) fast attack craft, commissioned 1957—1975 : (Type 148) fast attack craft, decommissioned Immelmann: air control ship; K V-class : (Type 520) utility landing craft, used as transport ships (decommissioned) Irben (1935): mine-warfare vessel : 5,000 ton protected cruiser, launched 1887 Isar (1930): submarine tender : (Type 402) tender J Jade (1967): support ship : gunboat, launched 1860 : torpedo gunboat : aviso, launched 1888 Jagd (1919): tender Jagd (1935): escort vessel (gunboat): , launched 19 August 1898, commissioned 4 April 1899, scuttled 7 November 1914 Jaguar (1928): torpedo boat : (Type 140) fast attack craft, commissioned 1957 to 1973 : (Type 148) fast attack craft, decommissioned Jasmund (K41): survey vessel Jena: minesweeper Jeverland (1937): tanker Jeverland (1940): replenishment ship Joh. L. Krüger: Project RL 234 research vessel Johann Wittenborg: experimental craft; Minesweeper 1916 Jordan: survey vessel Jordan: survey vessel Josef Römer: torpedo boat Josef Schares (753): missile boat Jüterbog (342): minesweeper Juist (1968): diver training vessel : (Type 722) tug Julius Adler: torpedo boat Juminda (1894): mine warfare vessel Jungingen (1919): tender : harbour craft, launched 1874 Jupiter (1944): minesweeper Jupiter (1961): minesweeper K Kärnten (1914): supply ship Kaiser: Agamemnon-class : 7,600 ton , launched 1874 : 25,000 ton , launched 1911 Kaiser: mine-warfare ship : 11,600 ton , launched 1900 : 11,600 ton , launched 1896 : 11,600 ton , launched 1899 : 11,600 ton , launched 1897 : auxiliary cruiser : 11,600 ton , launched 1899 : aviso : light cruiser, later renamed Seeadler : 25,000 ton , launched 1911 : 6,000 ton unique heavy cruiser, launched 1892 Kalkgrund II: Schooner lightship, built 1910 Kalkgrund: experimental craft; Stollergrund-class Karl F. Gauss: survey vessel : Type 1936 destroyer Karl Kolls (1903): experimental craft Kamerun: Norwegian minesweeper captured in April 1940, re-designated as Vorpostenboot, later to minelayer. Kamenz minesweeper Kamenz (S321): minesweeper Karl Liebknecht (123): frigate Karl Marx (142): frigate Karl Meseberg (733): missile boat Karl-Marx-Stadt minesweeper Karl Meyer: air control ship; K V-class : light cruiser, launched 1912 : light cruiser, launched 1916 (1927): 7,200 ton light cruiser, launched 1927 Karlsruhe (F223): Köln-class frigate : (Type 122) frigate : (Type 520) utility landing craft, used as transport ships (decommissioned) Kehrwieder: mine-warfare ships; Minesweeper 1916 Kiebitz (1938): mine warfare vessel Kiel: paddle steamer Kirchdorf (G425): minesweeper Klütz (G416): minesweeper Knechtsand: harbour tug; Lütje Hörn-class Knechtsand: harbour tug; Nordstrand-class : (Type 320) minesweeper, commissioned 1958 to 1975, upgraded