NOT KNOWN FACTS ABOUT HYDROGRAPHIC SURVEY IN BANGLADESH

Coastline Survey's historic maps and charts can be found from the next portals: Bathymetry and fishing maps: Down load thorough contour maps of U.S. waters and The nice Lakes. These maps haven't been up to date since 1990 but They could provide element in the seafloor, and are handy for fishing and undersea exploration. Coastline Survey Historical