Fire Control & Observation: The T-90S has the 1A45T IFCS (Integrated Fire Control System) which is automatic, but has a manual override for the commander. The IFCS comprises the gunner's day/night fire-control system, gunner's IR sight or thermal imaging sight, and commander's day/night sight-observation system. The fire control system comprises day sight-rangefinder with missile guidance channel, armament stabilizer and ballistic computer. The commander's day/night sight-observation system is used by the commander for gun and machine gun fire control.
