Sensor beacon

A sensor beacon, or a sensor marker, also referred to as a thumper, was a type of sensor that was designed to transmit its exact position. Sensor beacons were attached to people, vehicles, or objects, often discreetly, in order to track them. Some sensor beacons could also scan the individuals in their vicinity. On the planet Barton IV, a perimeter of sensors were used to keep wildlife away from the Imperial Depot. They were also used to mark the perimeters of planetary facilities. When establishing Chopper Base on the planet Atollon, members of the Phoenix Cell, such as Lieutenant Dicer, placed sensor markers around the base in order to detect incoming vehicles. After their encounter with the spidery krykna, the rebels discovered the sensors repelled the creatures, and used the sensors to keep them away from the base.

Text and facts from the “Sensor beacon” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.