FACTS ABOUT HYDROGRAPHIC SURVEY IN DHAKA REVEALED

We’re the oldsters who generate Tremendous exact maps on the seafloor and riverbeds. Why? Perfectly, to ensure ships and submarines can sail easily without any unpredicted bumps. It’s such as GPS on the h2o, holding Everybody Harmless and audio.Echosounders grew to become common while in the 1930s and permitted just one person to record depths