The best maritime navigation maps are nautical charts. They contain topographic map details (heights of land and depths of water), locations of natural and manmade obstacles, tides and currents data, geomagnetic field data, details of coastlines and more.
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cubic meter
Volume is the measure of the 3-dimensional space occupied by matter, or enclosed by a surface, measured in cubic units. The SI unit of volume is the cubic meter (m3), which is a derived unit. Liter (L) is a special name for the cubic decimeter (dm3).
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Those are personal questions
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