wind vanes, self steering devices
My monitor works well, but not as well as my Autoheln. I have gotten used to pushing a button and changing course by 1or 2 degrees. I beleive that they now have an attachment to hook up a small tillerpilot tothe windvane and that should help keep the boat on a magnetic heading rather than on apparent wind heading.
Also use spectra lines on the vane as others have atendency to streach.