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A tachyon scan, also known as a tachyon signal involved a starship emitting a tachyon beam at a particular location in an attempt to detect cloaked vessels by finding tachyon emissions given off by a cloaking device. Although a tachyon scan would detect most vessels using a cloaking device, its range was relatively limited but could be vastly increased by setting up a tachyon detection grid. (TNG: "Redemption II", "Face of the Enemy"; DS9: "Apocalypse Rising") This technique could also be used to scan quantum singularities. (VOY: "Parallax")
However, the Remans were able to remedy tachyon scans by developing a highly-advanced cloaking device that produced no tachyon emissions, rendering the user completely undetectable to all known scanning methods. Such a cloaking device was incorporated in to their massive wardbird, the Scimitar. (Star Trek Nemesis)