Matthew Fontaine Maury

Matthew Fontaine Maury (January 14, 1806 – February 1, 1873) was an American astronomer, historian, oceanographer, meteorologist, cartographer, author, geologist, educator, and naval officer for the United States and then the Confederacy. He was a devout Christian and, after reading Psalm 8:8, was determined to find "the paths of the seas".
He became Superintendent of the United States Naval Observatory and head of the Depot of Charts and Instruments. There, Maury studied thousands of ships' logs and charts. He published the Wind and Current Chart of the North Atlantic, which showed sailors how to use the ocean's currents and winds to their advantage, drastically reducing the length of ocean voyages. Maury's uniform system of recording oceanographic data was adopted by navies and merchant marines around the world and was used to develop charts for all the major trade routes.
With the outbreak of the American Civil War, Maury, a Virginian, resigned his commission as a US Navy commander and joined the Confederacy. He spent the war in the South as well as an envoy of the Confederacy to Great Britain, Ireland, and France.