Perhaps the most significant single avionics system fitted upon the Tiger is the mast-mounted Osiris sight/sensor; this incorporates optical TV and thermal cameras, a laser range finder/tracker/designator, and multiple gyroscopes for stabilisation. Osiris performs as the main sensor for target observation and acquisition, providing firing and targeting data via the weapons computer; Osiris also enables entirely passive target acquisition to be undertaken and was developed to maximise the capabilities of the Trigat anti-tank missile developed in parallel to the Tiger itself. An alternative optical system to Osiris is mounted on the aircraft's roof upon some variants.