Masking circuitry was a stealth technology observed by USS Voyager in use aboard a warship of the Kazon-Nistrim to minimize their sensor signature.

The circuitry was not nearly as effective as a true cloaking device: ships employing them being somewhat detectable (as a "reflection") when they moved into certain angles from the sun. Ionization trails might also be detected. Furthermore, the effects of the circuitry could be temporarily defeated with a polaron burst.

Tuvok later speculated that the ship had been able to deceive the sensors of Voyager' because someone aboard Voyager had sent instruction how to. (VOY: "State of Flux")

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