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pl23_ship1186.jpg

Alidade mounted on gyrocompass repeater for taking bearings

Image

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Permalink

https://www.noaa.gov/media/digital-library-photo/pl23ship1186jpg

Description

Alidade mounted on gyrocompass repeater for taking bearings. Appears tobe at sunrise offshore from Boston. By observing azimuth of sun at sunrise andsunset and comparing to pre-computed values, gyro-compass error can bedetermined.

Photographer

Lieutenant Jeremy Weirich

Collection

Sailing for Science

NOAA Affiliation

NOAA Corps