Charting the Course: Ohio River test bed explores future of navigation A screen from a commercial Electronic Chart System shows both electronic Aids to Navigation and enhanced Marine Safety Information in the vicinity of the Olmsted Lock near Olmsted, Ill. Coast Guard graphic SHARE: Download: Full Size (0.06 MB) Tags: U.S. Army Corps of Engineers, Kentucky, Louisville, U.S. Coast Guard, Ohio River Test Bed, Enhanced Marine Safety Information Credit: Coast Guard VIRIN: 170110-G-ZZ999-010.JPG Photo Gallery