 The MINISID and its smaller version the MICROSID were personnel detection devices often used in combination with the magnetic intrusiondetector (MAGID).Combining sensors in this way improved the ability of individual sensors to detect targets and reduced false alarms.Today's AN/GSQ-187 Improved Remote Battlefield Sensor System (I-REMBASS) is a passive acoustic sensor which with other MASINT sensors detects vehicles and humans on a battlefield, multiple acoustic, seismic, and magnetic sensors combine modes to discriminate real targets.