pl23_ship5139.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23ship5139jpgDescription
The view through a bridge wing alidade of a lighthouse ahead. When the linebisecting the circle is dead on the desired object, a simultaneous reading ofthe compass circle is made to determine the azimuth to the feature.
Credit
Crew and Officers of NOAA Ship FAIRWEATHER
Display Date
2010 April 11
Collection
Sailing for Science