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In 2367, Lieutenant Commander Susanna Leijten suggested installing proximity detectors on the surface of Tarchannen III as an aide in locating several former colleagues from the USS Victory. (TNG episode: "Identity Crisis")
As well as having military applications, proximity detectors were also incorporated into anbo-jyutsu rings and would detect a players movements. When a player is approaching the edge of a ring the detector would send out an alarm to alert them. (VOY short story: "Winds of Change")