Army quartermaster: A vessel’s living compass
Instruments used to help determine course direction and speed when navigating a ship lay on a chart on the General Frank S. Besson-class logistics support vessel at Joint Base Langley-Eustis, Va., June 23, 2017. Although the ship comes equipped with electronic navigation systems, as an added safety measure, the crew also manually tracks information using charts. (U.S. Air Force photo/Airman 1st Class Kaylee Dubois)