Originally Posted by Loki9
I haven't used one like that, but I think the purpose is to let you steer the same number as you tack back and forth toward a windward goal. For example, on the first tack you find yourself steering red 2, then on the next tack you'll want to steer a black 2.
Thanks, makes sense. I tried to find a manual on line but no luck yet. Will try it next time I tack.