Hello, the manual says: Pressing and holding the switch aligns the radar antenna with the ARL in acquisition and tracking phase of DM, DG and GUNS modes.  If locked, the radar will continue to track the target. When the switch is released, the antenna returns to the previous azimuth and tracking position.   I am trying to make it work or get some kind of feedback on the aircraft when I press it but I don't see functionality anywhere...any ideas?   Thanks!!!