The tools of the trade for navigating during launch hydrography.
Metallic and plastic three-arm protractors for plotting three-point fixes.
Sextant in background.
1931 Hydrographic Manual
Image ID: theb2236, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Credit: NOAA Central Library
Category: Charting/Navigation/Visual Signals/Sextant/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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May 12, 2014