I don’t see why the auto pilot wouldn’t hold a course without a chart plotter. I will turn my plotter off and try it out on the way to Sucia so I can let you know for sure when we talk there. As for the rate of correction…. There are a couple different settings. Mine is on the lowest and I find that its steers very much as I do with a pretty constant turning back and forth to keep the heading straight. My impression is that it does a better job of maintaining the course than I do. Less wobble in the wake line.