hydrographer

from The Collaborative International Dictionary of English v.0.48
Hydrographer \Hy*drog"ra*pher\, n.
   One skilled in the hydrography; one who surveys, or draws
   maps or charts of, the sea, lakes, or other waters, with the
   adjacent shores; one who describes the sea or other waters.
   --Boyle. Hydrographic
    

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