With a 3pt bar on an air cart I can certainly see where the bar could be moving back and forth that much - not saying that is what it was but it sure could be. We have a 54 foot field cultivator we use eDrive on a 9400T with and we have to put in some overlap simply because the cultivator will move back and forth a few feet depending on if one side goes deeper or catches a terrace. Nothing the GPS can do about that.

John