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3 Point Sextant Fix
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Coast-Geodetic-Survey
Nautical Charting
Navigation
3 Point Sextant Fix
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Measuring three-point sextant fix during launch hydrography.
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Measuring three-point sextant fix during launch hydrography.Launch off of LESTER JONES
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The end of a hard day of launch hydrography.Launch off of PATHFINDER
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Taking horizontal sextant angles from ship's mast.Photograph from 1931 Hydrographic Manual
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Lieutenant Roswell Bolstad measuring a horizontal angle.On LYDONIA
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Taking sextant angles for positioning vessel.
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Working together for a three-point sextant fix.Note horizontal attitude of sextants
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Calibrating Raydist by using three-point sextant fix.Initial tests of Raydist off of SOSBEE
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Launch hydrography three-point sextant fix.Surveying lagoon at Kwajalein Island.Party off of PIONEER
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Launch hydrography three-point sextant fix.Surveying in vicinity of Kalgin Island.Party off of SURVEYOR
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Wharton and Jeffries taking three-point sextant fix.Surveying in vicinity of Kalgin Island.On SURVEYOR
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Taking three-point sextant fix with check angle.Calibrating electronic navigation system.Third man searching for signal.On NOAA Launch 1255
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Taking three-point sextant fix with check angle.Calibrating electronic navigation system.On NOAA Launch 1255
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Checking index error of sextants prior to conducting launch hydrography.
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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
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Checking boatsheet during wiredrag survey of Mitchell Jordan Reservoir.Plastic three-arm protractor for plotting fixes barely visible under hand.Surveying reservoir for seaplane landing site during WWII ferrying operations.Wiredrag party of Max G. Ri
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Plotting three-point sextant fix with metallic three-arm protractor.On the FATHOMER
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Manual plotting of three-point sextant fix.Using plastic three-arm protractor
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Geometry of the three-point sextant fix.Diagram shows shoreline, stations, and angles measured.1931 Hydrographic Manual
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Graphic of various combinations of strong and weak three-point fixes.Hydrographic Manual
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