An exemplary embodiment suggested in the present disclosure relates to an apparatus and a method of controlling a work machine of a work vehicle. A base member supports the pole member, and a bottom edge guide member extends from a top surface of the base member. The method according to the invention is used to present the useful aeronautical map information superimposed on a conventional altimetric presentation of the terrain being flown over, while retaining a legibility that is acceptable to the user. The analog mixer is configured to output current passing through the selected data line, or to couple all of the data lines to a means for measuring current in accordance with a total current measurement controlling signal.