Re: Calculating true wind
The reality is that the speed and course over ground will give you a closer to real True wind, in other words the wind that you would feel if you are anchored.
But for most sailing applications, and more specifically oddly enough for most racing applications, the instruments produce a "true wind" which is really a wind velocity that is not corrected for current, in other words, the wind that you would feel if you were drifting with the current.
Both are useful tactically but neither are extremely useful for sail trim or even for sail selection.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies