This feature allows for rotating the contour map about an axis perpendicular to the drawing.
Rotations: -90, -60, -30, 30, 60, 90
Clicking in one or the three right boxes moves the map contents clockwise around the origin, with smaller to larger stepsize.
Clicking in one or the three left boxes moves the map contents anti-clockwise around the origin, with smaller to larger stepsize.
Keyboard instruction: ZROT angle