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![Checking index error of sextants prior to conducting launch hydrography theb2235.jpg Checking index error of sextants prior to conducting launch hydrography](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2235.jpg?itok=pYOTqfsm)
Description
Checking index error of sextants prior to conducting launch hydrography. (Image credit: NOAA Office of Coast Survey)
Credit
NOAA Office of Coast Survey
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Navigation
3-Point Sextant Fix
Keywords
Charting
Visual Signals
Visual Signals
Sextant