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NOAA Photo Library Image - cgs00431

Chart 5101A, first published in 1939, showing contours to be used for contour- following navigation. This was the first chart produced by the C&GS and among the first in the world to have adequate bathymetry for use by mariners as a navigational tool. The data was acquired in the 1930's as the result of radio- acoustic ranging surveys allowing precise positioning far from shore.

Image ID: cgs00431, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: California,

High Resolution Photo Available

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Last Updated:
June 10, 2016