Geometry of the three-point sextant fix.
Diagram shows shoreline, stations, and angles measured.
1931 Hydrographic Manual
Image ID: theb2240, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Credit: NOAA Central Library
Category: Charting/Navigation/Visual Signals/Sextant/
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of the U.S. Department of Commerce, National Oceanic & Atmospheric
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July 7, 2015