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NOAA Photo Library Image - cgs00851

Large hydrographic signal erected by crew off NOAA Ship PEIRCE. This signal and other similar signals were used by ship to calibrate electronic navigation systems.

Image ID: cgs00851, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Wisconsin, Apostle Islands, Lake Superior
Photo Date: 1982
Photographer: Commander George Leigh, NOAA Corps (ret.)

High Resolution Photo Available

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Last Updated:
November 10, 2017