Dennis Warren, survey technician uses every hour to get a proper reading of the speed of sound from the water’s surface to the bottom of the survey area in The Chesapeake Bay. The velocity profiler is a tool commonly used as it helps the crew determine the depths of the water as they are conducting the survey at different points of the job.

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Photo by: Stacy Ouellette |  VIRIN: 121105-A-CE999-032.JPG