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Captain A. Theberge and Lt. Mike Abbott discuss ship-handling during CTD's.Chief Boatswain Joe Dimartino watches over winch operator during CTD operations. CTD - Conductivity, Temperature, Depth measurements.MT. MITCHELL CTD's used to determine ocean sound velocity structure.Sound velocity information used to correct soundings during bathymetric mapping (Image credit: Personnel of NOAA Ship MT. MITCHELL 1991)