World Hydrography Day (WHD) is celebrated on June 21of each year to commemorate the establishment of the International Hydrographic Organization (IHO). Basically, it is designed to raise awareness among the mass people about hydrography and to give ideas on how it plays a role in improving knowledge of the seas and oceans. This year's World Hydrography Day theme is: "Hydrography - Contributing to the United Nations Ocean Decade". The theme is intended to highlight the relevant contribution of hydrography as a discipline of applied sciences to the United Nations Decade of Ocean Science for Sustainable Development (2021- 2030) in short 'Ocean Decade'. The suggested theme offers the opportunity to emphasize the ability of hydrographers to gather and manage marine data and their strengths in technical collaboration on a global scale.....