How to Set Up an AB Line for Field Work

Start with a line you can use

An AB line gets its name from two points. Mark A near the start of a straight reference pass and B farther along the direction you want to travel. The app extends that direction and lays out parallel guidance lines. Choose a route that fits the field and the job, such as the longest useful straight run. Put some distance between A and B; points set almost on top of each other don't establish a very useful direction.

Set up the implement, too

Before you make the next pass, enter the width the tool actually works in the field. The number on the equipment brochure may not match your active sprayer boom, nozzle setup, or effective tillage width. If the implement runs off to one side, check its offset. These settings determine where the app puts the neighboring lines.

Run a quick reality check

Drive the reference pass, turn, and inspect the next one on the ground. Watch for strips, overlap, and a drifting position marker. If the display is bouncing around, an AB line won't cure a weak location signal. Stop and sort out positioning before you commit to the whole field. Once you have a usable line, save it so you can find it again for that field.