Coast Survey's historic maps and charts can be obtained from the following portals: Bathymetry and fishing maps: Download detailed contour maps of U.S. waters and the Great Lakes. These maps have not been up-to-date because 1990 but They could offer depth with the seafloor, and so are useful for fishing https://hydrographic-survey16159.blogitright.com/32321036/the-ultimate-guide-to-hydrographic-survey-in-bangladesh