Voluntary observing ship program
Due to the importance of surface weather observations from the surface of the ocean, the voluntary observing ship program, known as VOS, was set up to train crews how to take weather observations while at sea and also to calibrate weather sensors used aboard ships when they arrive in port, such as barometers and thermometers. An Automatic Voluntary Observing Ships (AVOS) System is an automated weather station that transmits VOS program reports.
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