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Hughes AN/TPQ-36 Firefinder Weapon Locating System is a mobile radar system developed by Hughes Aircraft Company and manufactured by Northrop Grumman and ThalesRaytheonSystems. The system is a "weapon-locating radar", designed to detect and track incoming artillery and rocket fire to determine the point of origin for counterbattery fire. It is currently in service at battalion and higher levels in the United States Army, United States Marine Corps and Australian Army. Also Turkish Army , Portugal and Ukrainian Army are among the users.
The radar is typically trailer mounted and towed by a Humvee.
Firefinder (V)7 adds a Modular Azimuth Position System (MAPS). MAPS has a North Seeking Laser Gyrocompass and a microprocessor controlled Honeywell H-726 Inertial Navigation System. Prior Firefinders used a survey team to find site latitude, longitude, and direction to North. With MAPS, reaction time was limited only by site set-up, since system geo-position was pre-loaded before sortie deployment. Crew was reduced from 8 to 6.