An Anemometer is an instrument for measuring wind speed. It can take various forms, the most often seen is the type with three or more small cups that are blown around a vertical axis - they appear on Meteorological stations and on the masts of some boats.
On sailing boats the main use is probably to assess the situation from a safety standpoint - is there too much wind? Should we reef (reduce the size of) our sails?
Most experienced sailors in their own boats will know this by the feel of the wind and the motion of the boat, but may still carry one for confirmation as well as boasting rights!
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