This was taken last week crossing the English Channel
The close-hauled wind
instrument reads 28 degrees, but the boat was on autopilot
with the wind-following function set at 35 degrees, which is as close as I can set it for a long passage
without constantly fiddling with the sails
. The 28 degrees was a brief moment rounding up a little in a puff.
In good conditions with relatively smooth water
and a steady sailing wind, sailing 35 degrees off the apparent wind gives me a tack through just about 90 degrees on the GPS
or at the very best just a couple of degrees less. That's with no tide.
As someone said, you get a huge knock on your tacking angle with an adverse tide, and a huge lift
with a favorable tide. That's because a favorable tide when sailing upwind creates a vector towards the wind which alters your COG compared to your course through the water