I am starting a tree planting project. I would like some sort of external light or horn to tell my crew when to plant a tree every 10 feet. We are running an New Holland with FMX and auto steer, with a transplanter. A person will be on the transplanter, dropping seedlings into the transplanter as the tractor runs its AB line. I would like some light or horn to let them know when to plant the tree, so we can keep some precision and not have to flag the plot. Any input would be helpful.