SS Cubango – cargo ship converted in a seaplane tender in 1931
Spain
Dedalo 9,900 ton ex-German cargo ship Neuenfels 1901, transferred to Spain 1921, converted to seaplane carrier 1922. Scrapped 1 March 1940
Romania
Regele Carol I – passenger steamer leased to Russia during World War I and converted to seaplane tender and minelayer, sunk during World War II in October 1941
Russia
Russia is one of birthplaces of naval aviation. Catchinskaia school of aviators (near Sevastopol) began to work in 1910 under the patronage of Admiral, Grand Duke Aleksandr Michailowich (Romanov-dynasty). Ships:
Almaz – Russian for "Diamond". Light (3d rank) cruiser of The Russian Imperial Navy. Veteran of the Tsushima Battle. Transferred from Far East to Black Sea Fleet. Participated in the 1914 Battle of Cape Sarytch (against "Goeben") and First Bombardment of Bosphorus 28 March 1915. In November 1914 converted to hydrocruiser (hydro aircraft carrier). Seaplanes from Almaz provide bombardment the targets on the Turkish and Bulgarian shores. After the October Revolution ship acquired a terrible reputation as a floating prison, where in 1918 revolutionary sailors executed the enemies of the revolution – officers, merchants and other "bourgeois" and "counter-revolutionaries".
Imperator Nikolai Pervij – Russian for "Emperor Nicholas The First". Hydro-avia-transport of the Black Sea Fleet. Aircraft from cruiser supported Army assaults on Caucasian Front, participated in Trapesund landings 1916.
Princessa Maria – hydro-avia-transport of the Black Sea Fleet, converted from a Romanian liner.
Orlitsa – Russian for "She-Eagle", hydro-avia-transport of the Baltic Fleet. Attached to the Sea Force Riga Gulf. The day 16 of July 1916 when M-9s from "Orlitsa" engaged in a battle with four German sea planes and shot down two, is now celebrated in Russia as the Day of Naval Aviation.
Imperator Trajan – Russian for "Emperor Trajan", hydro-avia-transport of the Black Sea Fleet, converted from Romanian steamer. Take active service during WWI Black Sea Campaign.
Dacia – hydro-avia-transport of the Black Sea Fleet. Converted from a Romanian steamer. Take active service during WWI Black Sea Campaign.
Imperator Alexandr Pervij – Russian "Emperor Alexander The First", hydro-avia-transport of the Black Sea Fleet. Converted from a merchant steamer. Sea planes from "Alexander I" and "Nicholas I" 24.01.1916 participated in bombing Turkish port of Zonguldack and sinking transports there. Later participated in Trapesund landings – aircraft from the ship covered landing ships and acted as artillery observers for the battleships.
Ruminia – Russian for "Romania". Hydro-avia-transport of the Black Sea Fleet. Converted from Romanian merchant steamer.
Communa – one of the hydro-avia-transports of the Bolshevik Volga Military Flotilla during the Russian Civil War. Participated in fighting against White movement fleets and armies on the Volga river.