World Hydrography Day
June 21 · Level 7 · #825 of 2238
World Hydrography Day celebrates the work of measuring and mapping bodies of water. It highlights the information that helps ships navigate safely and gives scientists and engineers a clearer picture of what lies beneath the surface.
How it is celebrated: hydrographic offices host talks, chart exhibitions and meetings with survey specialists. Demonstrations explain how survey teams measure depths and locate underwater hazards.
A multibeam echo sounder can survey a whole strip of seabed at once, building its map from returning pulses of sound.
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