Auto area recording?

I am on the market for a tractor gps for spreading slurry and fert, I would like auto area recording as there is enough going on at the headland when trying to turn the dribble bar without having to also press the gps screen. I can't imagine me using it manually whilst doing a 3 point turn and opening/closing the dribble bar and diverting slurry back to the store momentarily etc

Does auto area recording exist, how does it work and who offers it?