 The Finnish Navy was a coastal defence force with two coastal defence ships , five submarines , four gunboats , seven motor torpedo boats , one minelayer and six minesweepers . The two coastal defence ships , Ilmarinen and Väinämöinen , were moved to the harbour in Turku where they were used to bolster the air defences . Their anti @-@ aircraft guns shot down one or two planes over the city , and the ships remained there for the rest of the war . In addition to its role in coastal defence , the Finnish Navy protected the Åland islands and Finnish merchant vessels in the Baltic Sea . 
