Unidentified UNSC scanning device
From Halopedia, the Halo wiki
This unidentified scanning device is a piece of equipment used by the United Nations Space Command to detect signal frequencies, specifically weak signals with a short radius. In order for the scanning device to function properly, the operator must get close enough to be able to read any signals in the area.
Shortly after the Battle of Miridem in 2544, such a device was utilized by a team of Spartans during their mission to rescue Dr. Catherine Halsey from a Covenant fleet by using OF92/EVA Booster Frames. The fleet's Supreme Commander, Luro 'Taralumee, was able to fool the scanning device's sensors and make it appear that there were multiple signals; these false signals were baited traps, as they led to antimatter charges. One of these decoys was successful, resulting in the death of Solomon-069. However, John-117 realized that the Covenant knew the Spartans' objective; he thus deduced that Halsey's real signal originated from the Covenant flagship, Resplendent Fervor.
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