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Motion sensor
https://halo.fandom.com/wiki/Motion_sensor
Spartans and Elites have a Motion Tracking Sensor built into the HUD of their helmets and armor. The sensor shows individual allies as yellow dots and allied vehicles as larger yellow dots. Enemies are shown as red dots, with Hunters and enemy vehicles represented by larger red dots. Flood Infection Forms are shown as small red dots, the only exception being in the level The Covenant, when they are allies. They are then shown as small yellow dots. The motion tracker shows how close the other characters are in relation to your current position, up to 25 meters. When someone on the other team in multiplayer speaks, their red blip is surrounded by a white glow and it becomes bigger. Nav points will also show up, shown only as a small white triangle at the end of the sensor. The UNSC accomplishes this through the use of neural implants, which are computer chips surgically implanted into the back of a recruit's skull allowing markers to register them as friendlies on the motion sensor and provide other sensor data.
