Flags on bell and whistle buoys.
Using harbor buoys for signals for survey work off the BACHE.
Black flags showed up best
Image ID: theb2214, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Southeast Coast of United States
Photo Date: 1915
Credit: C&GS Season's Report Luce 1915-49
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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April 30, 2013