1. Join any Server or start a single mission with enemy vehicles.
2. Enter a jet or PO-30 in first-person view.
3. While in the cockpit, pan your view off the center.
4. Switch the weapon of the aircraft to missiles.
5. Impose the HUD marker onto an enemy targets and try to lock it on. (it won't work)
6. Scroll your mouse and impose the action marker in the center of the screen onto the same target. Try to lock it on again. ( It will work this time because action markers are in the center of the screen).
7. Center your view and do step #5 again. ( It also will work)