There is provided a vehicle driving device. This invention also relates to inbred maize lines derived from inbred maize line PH7JB, to methods for producing other inbred maize lines derived from inbred maize line PH7JB and to the inbred maize lines derived by the use of those methods. Other embodiments are disclosed. Alternately or in addition, the tracking device may include a battery that provides power to the tracking device and is recharged by the power receiving device. The irrigation system controller is further enabled to generate a report of the soil condition. The brackets are hinged to magnet mounts, which each hold a permanent magnet that releasably holds the ladder in place against the work surface.