pl23_cgs00926.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23cgs00926jpgDescription
Taut-wire sun azimuth controlled surveys. Basically a form of baselinemeasurement and triangulation that allowed positioning buoys for both visualsurveys and RAR surveys far offshore. Accuracy was of the order of 1 part in3000.
Credit
NOAA Historical Image
Category
Historic Coast & Geodetic Survey