Coast Survey's historic maps and charts are available from the next portals: Bathymetry and fishing maps: Down load in depth contour maps of U.S. waters and The good Lakes. These maps haven't been updated since 1990 but They could offer depth from the seafloor, and therefore are valuable for fishing https://hydrographic-survey00875.look4blog.com/70971038/how-hydrographic-survey-can-save-you-time-stress-and-money