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NOAA Photo Library Image - cgs05102

A loose hand-written note stating "Soundings are referred to mean low water as a plane of reference & are expressed in feet ...." A statement of the vertical datum used for charting in the compilation of nautical charts at the time the note was written.

Image ID: cgs05102, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1851 ca.
Credit: NARA C&GS Colllection

Category: Coast and Geodetic Survey/Archive Tides/

High Resolution Photo Available





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Last Updated:
April 30, 2013