2.6K views · 61 reactions | 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, our latest episode of ‘NGA Explains’ has one of our experts explain what it is, what it is used for and how NGA helps ensure maritime safety. | National Geospatial-Intelligence Agency | Facebook
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2.6K views · 61 reactions | With less than five percent of the Earth’s oc…
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