Detectors for Radio Triangulation, or "Detectors" are devices planted by the British to monitor enemy movement. They are only available to the British Royal Commandos Support company in Company of Heroes: Opposing Fronts, and only once the Radio Triangulation Detectors Command Upgrade has been purchased. Once three have been placed on the map, any enemy unit moving through the area between these three points will be revealed on the Tactical Map and Mini-Map (but not in the 3D battlefield).