That is correct ......the advanced AP has the circle around it.....it works by taking GPS readings and navigating from reading to reading so if its windy you will be blown off course between readings thus you will be going zig zag instead of straight. The plain AP without the circle works by compass reading and therefore will keep you on a lot straighter course. Just hold the button down untill you hear the beep and you will be set on AP without the circle.