Alidade mounted on gyrocompass repeater for taking bearings

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

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Author: Lieutenant Jeremy Weirich, NOAA Corps/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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