I have an EZ250 with a ag15 antenna that's about 2 years old that gets off track, according to the spec's on this unit it should be able to operate equipment by itself, even when I first got it I wasn't really impressed with it because I would lay off a straight line for it reference as i am using the AB setting and by the time i made a dozen passes my trails looked like a rocking chair rocker,now not only does it crook them, according to the paint marker it's vearing off the coverage width, i have stepped off a couple places it showed to be missing and it was, I've check the settings and from what I understand they are correct with the exception of the last update mine is 3.00 the new one is 3.10 could this be my problem or am i doing something wrong,I used the neighbors light bar before buying this unit it took a little getting use too but once I figured out that the light bar was a general reference and quit try to keep the lights centered it worked good.