Hydrography is the science that measures and describes the physical features of the sea and adjoining coastal areas, and it is not bounded within the nautical charts and publications. It encompasses many other dimensions of the sea such as, marine resource exploitation, environmental protection and management, maritime boundary delimitation, marine spatial planning, tsunami flood and inundation modelling, coastal zone management, marine tourism, science and maritime defence etc. Being a littoral state of Bay of Bengal, 94% of trade and commerce of Bangladesh is seaborne. On the other hand, exploration and exploitation of living and non-living resources also need various kinds of technical data of the sea. Thus, hydrography not only contributes to the safe navigation, it also helps in economic well-being, protects the marine environment and above all contributes to the security of the country.....