The transducer for the subbottom profiler, secured on the gunwale while the boat is underway.
Transducer
Image courtesy of the Search for the Lost French Fleet of 1565 Expedition, NOAA-OER/St. Augustine Lighthouse & Museum. Download larger version (jpg, 400 KB).

The transducer for the subbottom profiler, secured on the gunwale while the boat is underway. The cone-like transducer will be lowered straight down into the water during survey, so that it can send soundwaves directly down into the seafloor to potentially “see” buried wreckage.

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