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NOAA Photo Library Image - ship1186

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.

Image ID: ship1186, NOAA's Fleet Then and Now - Sailing for Science Collection
Photographer: Lieutenant Jeremy Weirich, NOAA Corps

High Resolution Photo Available

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Last Updated:
November 10, 2017