Locator

"Captain Rex, keep your locator on. We should be back by daybreak with whoever or whatever lives on this planet."

- Aayla Secura, to Rex

A locator was a personal device that functioned similar to a homing beacon, sending a signal that allowed the user to be tracked. A number of the Grand Army of the Republic's clone troopers, such as Clone Captain Rex and trooper Tup, carried locators as part of their battlefield equipment.