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2:12
YouTube
National Geospatial-Intelligence Agency
NGA Explains: What is Hydrography? (Episode 4)
With less than five percent of the Earth’s oceans explored, we rely on the study of hydrography to help ensure safety of navigation. Don’t know what hydrography is or does? No worries, in this episode of ‘NGA Explains’ one of our experts explains what it is, what it is used for, and how NGA helps ensure maritime safety.
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