Île-Tudy is a commune in the Finistère department of Brittany in northwestern France. Inhabitants of Île-Tudy are called in French Îlie…Île-Tudy is a commune in the Finistère department of Brittany in northwestern France. Inhabitants of Île-Tudy are called in French Îliens. The United States Navy established a naval air station on 14 March 1918 to operate seaplanes during World War I. The base closed shortly after the First Armistice at Compiègne.