Digital collections
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
Category
Sailing for Science
NOAA Affiliation
NOAA Corps