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Reply To: Raymarine st60 masthead wind speed & direction instrument

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#31481
Yves Devillers
Participant

Beware that measuring the speed of wind is a tricky issue in itslef.
Meteoroloist will measure it at a heigh of 10 méters and will average it over one or ten minute, averaging period being much less for gusts of course.

The wind speed varies much with height and with air mass stability and converting a measure made à 18m in an air mass after a warm or a cold front call for abacus. I had some, stored in a place I don’t remember ;-), anyway the text is in French 😉

One last point is that air mass, even on a very small scale like boat distances in a marina, are very heterogenous with lot of eddies. It is not abnormal to see two transducer of the same type revolving at different speed, the faster not being always the same. Thus the need for averaging your mesurement.