Tracking scanners are terran devices built into missile turrets. They identify a target, even if it's cloaked, though are not able to reveal it as such. However, as per the lock-on, powerful sensors are able to home in on the target, identifying it and proceeding to deal with it via a missile.


Mesta, Gabriel (July 1, 2001). StarCraft: Shadow of the Xel'Naga. Simon & Schuster (Pocket Star). ISBN 0-671-04149-5