
UNSC Pilots operating Pelican dropships are able to utilise the Integrated Helmet and Display Sight System to allow the craft's on-board mounted M370 autocannons to track the gunner's eye movements and aim accordingly.Īdditionally, some HUDs including the one used in the ODST armor system, integrate a sophisticated battlefield intelligence system, the VISR, that improves the users vision in low light areas, also outlining objects in the immediate area - green outlines are "friendly" units, red outlines are "enemy combatants" and blue outlines are discarded or abandoned equipment and weaponry that can be used. Heads-up display visuals are provided through the Marine's UNSC tactical eyepiece or ballistic goggles. The HUDs also typically include a compass wheel in the center of the upper portion. The shield bar is absent in armor systems which do not possess energy shielding, though health information is displayed. Many infantry HUDs, such as those used by UNSC Marines and the cadets at Corbulo Academy, incorporate a motion tracker, although at least some models of the ODST helmet lacked one as of 2552. The heads-up displays used by conventional UNSC infantry, including the UNSC Marine Corps and ODSTs, are largely similar to that of the MJOLNIR system, displaying weapons and grenades carried by the user as well as their ammunition, and projecting a targeting reticle to assist aim. The SPARTAN-IIs and IIIs also use them as an efficient channel of non-verbal communication, using combinations of the lights as a messaging system. The lights (blue/green, amber and red) can be manipulated by the wearer at will and are most prominently used to acknowledge orders or report complications. When operating in teams, Spartans employ a system of status lights on their HUDs. Finally, the way point indicators are an on-screen directive that point out important objectives or locations in the Spartan's mission, and are extremely useful, measuring the distance the Spartan is from the objective. Due to the insertion of IFF tags in UNSC soldiers, the radar can distinguish friend (yellow or blue) from foe (red). Located in the right-hand armor gauntlet, it can be configured to sense and track movement in a variety of radii, depending on what the user wants it to be. The motion tracker is another important feature displayed on the HUD. The reticle is also compatible with the scope of ranged weapons when installed. In the MJOLNIR HUD, each type of weapon that the gloves detect has its own unique aiming reticle in relation to the type of ammo that it projects and its statistics. Weapons' heat and ammunition levels, as well as grenade type and count are also detected through sensors placed in the Spartan's gloves.

Additionally, the HUD also reports the strength of the wearer's shields through the energy signatures it emanates. In the various models of the MJOLNIR Powered Assault Armor, the sensors augmented into the Spartan's body display the soldier's vital signs on the HUD.
