Wrong again , S. Simian;

Those signs are mounted on the shore. They are to prevent "Wake" on the
shore line, not on the hull line

Once again; you've come to Neal conclusion which is wrong. My friend
you're need for another Slant to your statement; " Sailboats don't have
Wakes until they exceed hull speed." is definitely needed!

Try Again Simpleton, try again

Ole Thom