A helmet-mounted sight (HMS) developed by Luoyang Electro-Optics Technology Development Centre of AVIC was developed in parallel with the JF-17; it was first tested on Prototype 04 in 2006. It was dubbed as EO HMS, (Electro-Optical Helmet Mounted Sight) and was first revealed to the public in 2008 at the 7th Zhuhai Airshow, where a partial mock-up was on display. The HMS tracks the pilot's head and eye movements to guide missiles towards the pilot's visual target. An externally carried day/night laser designator targeting pod may be integrated with the avionics to guide laser-guided bombs (LGBs). An extra hardpoint may be added under the starboard air intake, opposite the cannon, for such pods. To reduce the numbers of targeting pods required, the aircraft's tactical data link can transmit target data to other aircraft not equipped with targeting pods. The communication systems comprise two VHF/UHF radios; the VHF radio has the capacity for data linking for communication with ground control centers, airborne early warning and control aircraft and combat aircraft with compatible data links for network-centric warfare, and improved situation awareness. The aircraft uses RLGs along with GPS for navigation. The aircraft is equipped with an IFF Transponder which allows it to differentiate between friendly aircraft and enemy aircraft. The ACMI aids in aerial combat for maneuvering.