The HMSS passive and stealthy sensor system has been developed and manufactured by BAE Systems to provide the Eurofighter pilot significant operational advantages

The UK Royal Air Force, Spanish Air Force, Italian Air Force and the German Luftwaffe have begun taking delivery of the most advanced helmet mounted symbology system (HMSS). It will form a key component of their Eurofighter Typhoon weapon systems.

The HMSS is said to have improved tactical performance for Eurofighter pilots by providing essential flight and weapon aiming information through line of sight imagery. The information imagery includes the aircraft’s flight parameters, weapons status and aiming all projected on the helmet equipment assembly (HEA) visor, enabling the pilot to simultaneously look out in any direction and have all required flight and weapon aiming information in his field of vision.