An agricultural machine includes a frame (130, 14, 30), an arm pivotally coupled to the frame (130, 14, 30) at a first end of the arm, and a target element (304) on the first end of the arm. The target element (304) is configured to rotate with the arm, and includes an outer surface (314) and a projection (238, 312) extending away from the outer surface (314). The agricultural machine also includes a first sensor (148G, 262) fixed to the frame (130, 14, 30). The first sensor (148G, 262) is configured to detect the outer surface (314). The agricultural machine also includes a second sensor (148G, 262) fixed to the frame (130, 14, 30). The second sensor (148G, 262) is configured to detect the projection (238, 312).
