Pilkington Optronics have developed a range of display helmets for airborne use. Comprising both monocular and binocular systems, the 'Guardian' range is aimed at helicopter and fixed wing aircraft. Pilkington Optronics has teamed with Kentron in South Africa to exploit their respective helmet technologies and to penetrate the display helmet market place. A number of key technologies have enabled the development of competitive systems. A half inch CRT has been developed which provides high brightness, high resolution and low weight. This coupled with advances in visor coating technologies has allowed a HMD system to be developed which leads the market. A headtracker developed by Kentron is an optical system and has undergone extensive flight trials in both helicopter and fast jet. It offers excellent installed accuracy an extensive headbox and has a number of key features which make it attractive to the end user.