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![Echometre record obtained by the French liner S map00079.jpg Echometre record obtained by the French liner S](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_map00079.jpg?itok=KDeW_aUU)
Description
Echometre record obtained by the French liner S.S. De Grasse when crossingover the head of a canyon on Georges Bank. Such records reinforced the viewthat vessels could navigate by using bathymetry. Accordingly, the United StatesCoast and Geodetic Survey embarked on a project to map the continental slopesand shelves to help guide mariners into United States ports. (Image credit: NOAA Central Library Historical Collection)