Sophisticated sonar and depth sounding have been indispensable to
commercial fishermen since the 1970s. Blobs above an outline of
the sea floor reveal schools of fish, so that fishermen know
where and how deep to drop nets §.
courtesy of Raytheon Marine Company
Ocean Planet Exhibition Floorplan
gene carl feldman (email@example.com) (301) 286-9428
Judith Gradwohl, Smithsonian Institution (Curator/Ocean Planet)