Marine weather observations

From Glossary of Meteorology
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marine weather observation

The weather as observed from a ship at sea, usually taken in accordance with procedures specified by the World Meteorological Organization.

The following elements are usually included: total cloud amount; wind direction and speed; visibility; current weather; pressure; temperature; selected cloud-layer data, that is, amount, type, and height; pressure tendency; seawater temperature; dewpoint temperature; state of the sea (waves); sea ice; and icing onboard ship. Also included are the date and time, and the name, position, course, and speed of the ship. The encoded and transmitted marine observations are known as ship reports.
See ocean station vessel.