ABSTRACT
The first head-up displays (HUDs) were developed during the late 1950s in several countries, based on reflecting gunsight technology. In these gunsights, the aiming symbol is generated from a light source and projected onto a semi-transparent mirror mounted between the pilot and the windshield. The projector is usually located in the top of the instrument panel. The aiming symbol appears to be ‘floating’ in the pilot’s view of the outside world.
