The STABILISED HORIZON REFERENCE SYSTEM (SHRS) is an illuminated bar that remains horizontal irrespective of the ships roll motion. This provides the pilot with a "True Horizon" reference whilst those lights fitted to the ships superstructure continue to show the ships actual angle of roll.

PILOT VISUAL CUES (PVCs) can be used in conjunction with the Horizon Bar in order to indicate final positioning while hovering above the flight deck prior to touchdown and capture by the ASIST system.