Image:Noaaship.jpg

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Hydrographic surveys are performed by NOAA ships using multi-beam and side-scan sonar systems to determine water depths, submerged dangers to navigation and obstructions. (Photo credit: Lt. Jon Swallow)

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Date/TimeDimensionsUserComment
current02:57, 11 January 2007240×158 (18 KB)Rickdrew (Talk | contribs) (Hydrographic surveys are performed by NOAA ships using multi-beam and side-scan sonar systems to determine water depths, submerged dangers to navigation and obstructions. (Photo credit: Lt. Jon Swallow))

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