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