Paulo, now you have confused me! But that's not hard I confuse easily
I don't think we are talking about the same thing. My plotter is not integrated with my navigation software on the computer, or with the wind instruments. My computer is linked to a handheld GPS only. Yea I know I should integrate everything together and it's on the (never ending) to do list
Below is a screenshot from the navigation software showing three tacks of the UFO 34 on Saturday. The total distance of the map is about 3.5NM from top to bottom. Wind was Southerly ranging from 7 to 13kts.
The information in red are the details from a "range and bearing lines" function on the navigation software. The first leg is showing 967m (range, which we can ignore) 132 degrees True and 134 degrees magnetic (bearings). The second leg shows 1.8 nm, 248 degrees T and 249 degrees M.
What I have done is taken the two true bearings and subtracted one from the other ie, 248 less 132 is 116. This is what I am assumming is my tacking angle, ie 115-120 tacking angle is the average for a number of tacks.
Paulo, I am not familiar with the system showing on your plotter. However if I understand it correctly if your plotter was on my boat I believe it would be giving a reading of 64 (rather than 90 or 120) using the bearings of 248 and 132 from the above example. However I could be totally confused!!!!