From Halopedia, the Halo wiki
The Integrated Helmet and Display Sight System (IHADSS) is a computer system used by the designated gunner on D77 Pelican dropships (and presumably those of UH-144 Falcons[note 1]). It determines where the gunner's eyes are focused and aims the M370 autocannons accordingly.[1][2] See also[edit]Note[edit]
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