Multiple realities
(covers information from several alternate timelines)
Chakotay, Janeway, Icheb, and Naomi Wildman utilize temporal sensors to analyze the damage done to Voyager
Temporal sensors were an advanced scanner technology utilized by the Borg to examine and analyze various distortions in time.
In 2377, when a chronokinetic surge fractured the USS Voyager into thirty-seven different time frames, Commander Chakotay and Captain Janeway utilized the ship's astrometrics lab, which had been equipped with Borg temporal sensors, to discern the extent of the fragmentation. Using this information, they were able bring Voyager back into temporal sync, and change history in such a way as the accident never occurred. (VOY: "Shattered")