Hi. I'm working on a digital filter, whose computations are dependent on calculating apparent wind. But i'm not entirely sure if i'm using the formula correct, because i find the description of variables some what vague. Would love if someone please could point out, what the alpha angle is representing on this page : https://en.wikipedia.org/wiki/Apparent_wind I am assuming that α = pointing angle, is true wind angle relative to the boat. Would that be correct? Thank you for any answers, and sorry if this might be wrong forum to post this thread.