pl23_ship1186.jpg
![Alidade mounted on gyrocompass repeater for taking bearings ship1186.jpg Alidade mounted on gyrocompass repeater for taking bearings](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_ship1186.jpg)
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