USC&GS Ranger was a steamer that served in the United States Coast and Geodetic Survey from 1919 to 1930 or 1931. Ranger was built as the civilian steam-driven, steel-hulled yacht Thomas Slocum in 1910 by the at City Island in the Bronx, New York. She later was renamed Ranger. From 1917 to 1919, she served in the United States Navy as patrol vessel USS Ranger (SP-237), being renamed USS SP-237 in 1918. Ranger was transferred back to the Navy on either 26 November 1930 or 31 January 1931. The Navy sold her on 21 December 1931, and she was registered in Panama in 1932.