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 Category: Navigation/ • High Resolution Photo Available
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