“…In the experiment, a compensatory display is presented to participants using a head-up-display (HUD), overlaid on either a homogeneous black background or a realistic outside visual scene. The controlled element dynamics are a low-order of AH-64 Apache yaw dynamics, 3,14,22,23 which are known to require significant human operator lead equalization. A no motion feedback condition was tested, in addition to three different break frequency settings for a unity-gain high-pass yaw motion filter (0, 0.58, and 1.73 rad/s), resulting in 0 deg, 30 deg, and 60 deg phase distortion at 1 rad/s.…”