I recently used a 'tiller pilot' system, 200 english
quids, which holds the set course.
These things can be wired into wind vanes, auto-pilots etc and are easy to intall with basic tools. There's a plus/minus one degree and ten degrees and an Auto/Standby button. It is all you need if you are maintaining a decent watch. If the winds are really fickle then you'll end up hand steering
Real bonus is single
handing (or not disturbing the resting crew) not forgetting lifelines
and attachment points of course.
Wind vanes are more for true single
handers, i.e. go to sleep, still sailing, and hope you wake up, still dry.