Tower alignment system and mechanism that allows programmed changes to the alignment automatically

This invention describes a system for automatically keeping large irrigation systems, like those with long pipelines on wheels, properly aligned. It uses a sensor to continuously measure the alignment of a drive tower. A controller then turns on the tower's motor if the alignment is within an acceptable range, and an actuator can physically adjust the controller's settings to change that acceptable range. The claims specifically describe this adjustment using a physical control switch and notches.