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![Alidade mounted on gyrocompass repeater for taking bearings ship1186.jpg Alidade mounted on gyrocompass repeater for taking bearings](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship1186.jpg?itok=GvqbWL0v)
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. (Image credit: Lieutenant Jeremy Weirich)
Photographer
Lieutenant Jeremy Weirich
Collection
Sailing for Science
NOAA Affiliation
NOAA Corps