A sensor net functioned as a detection technology.
To identify objects moving through an area, sensor nets were designed with overlapping sensor fields. These nets varied in their coverage area, allowing them to be used in ground-based locations such as camps and bases, or even expanded to cover entire star systems.
The initial defense strategy of the Mon Calamaris involved a sensor net, which utilized sensor buoys to monitor hyperspace routes heading towards the planet. Similarly, the world of Onderon possessed a system-spanning net. Saboteurs had to disable this net on the planet before the Alliance could successfully destroy Jyrenne Base.
During his time on Dellalt, Han Solo unintentionally activated a sensor net, which notified J'uoch's mining camp of his arrival.