There's the option of dropping the hook near a weather
bouy which downloads to NOAA/the Internet
in real time. The dropping the hook bit, is so that both you & the bouy are both in pretty much the same wind/weather cell & gust/wind variation pattern. Plus are both in clear air.
Although both download lag time, & differing pitching variations & how they affect what your respective sensors "read", will cause some inaccuracies. Ditto as to what type of instruments they're using, their accuracy, & date of last quality calibration.
As odds are, a bouy wont have a calibrated, air mass flow sensor, akin to the one under the hood
of your car.
That, & I'd suggest contacting both the manufacturer of the gear
which you have, as well as say B&G, and NKE. Plus doing a bit of manual downloading.
Especially as you need to know how to calibrate your gear
for upwash & the like, generated by the sails
(or even just the bare spar rigging) when you're underway.
Which of course will vary, based on; the TWA, AWA, TWS, AWS, boat speed, sail/sail combination, sensor height & offset from the masthead... and a dozen+ other items.
Though, the most vital, accurate calibrations, are at the lower end of the spectrum. Given that changes in wind speed generate pressure, load, & vector changes, based on a squared function.
And doing your cal
. the same way every time, is critical as well. So try & pick both a venue, & a proceedure (set of them) which are relatively easily repeatable.
Also, keep in mind that unless you climb up to the masthead with a (calibrated) handheld wind instrument, the data which you're reading at deck
level will always be significantly different than what the wind's doing up high.
Pull up a chart, & it'll tell you the differences in wind speeds, based per heights, so that you can get a fix on such.
For other weather
info knowledge, some small airports, & aviation schools have a wonderous volume of; knowledge, instruments, learning/study materials, & wisened pilots & instructors on the/related topics. Including... calibrating skills & tools.
Ditto on serious racing
fleets, especially one design, trans-oceanic type.
And this may sound goofy, but it may pay to read/search through back issues of the "Lee Helm/Max Ebb" column in Latitude 38
. As well as see about getting in touch with the authors of/technical contributors to said monlthly "info piece".
If you do, would you please be kind enough to post what you find out.