The A-10 has received many upgrades over the years. In 1978, the aircraft received the Pave Penny laser receiver pod, which sensed reflected laser radiation from a laser designator. Pave Penney has now been discontinued in favor more capable advanced targeting pods. The A-10 began receiving an inertial navigation system in 1980. Later, the Low-Altitude Safety and Targeting Enhancement (LASTE) upgrade provided computerized weapon-aiming equipment, an autopilot, and a ground-collision warning system. In 1999, aircraft began to receive Global Positioning System navigation systems and a new multi-function display. In 2005, the entire A-10 fleet began receiving the Precision Engagement upgrades that include an improved fire control system (FCS), electronic countermeasures (ECM), upgraded cockpit displays, the ability to deliver smart bombs, moving map display, hands on throttle and stick, digital stores management, LITENING and Sniper advanced targeting pod integration, situational awareness data link or SADL, variable message format, or VMF, GPS-guided weapons, and upgraded DC power. The entire A-10 fleet has been Precision Engagement modified and now carries the A-10C designation.
