Cloaking Device is a device that rendered a vessel equipped with it to turn invisible to an outside observer.
A development of the Pirate Clans, the device gives a large advantage to any ship equipped with it. By utilizing Dark Matter in some form, the cloaking device uses gravity to bend light waves around it in order to become invisible. This process also renders the cloaked vessel invisible to most sensors. The radiant energy would usually be regarded as background radiation, however Neosapian scout ships can track the energy trail if they are close enough to the cloaked ships. Thanks to Professor Algernon’s efforts and research into the device, the cloaking device was miniaturized to the point that it could be mounted in larger scale E-frames, such as the Rapid Assault E-frame piloted by Marsala.
Vessels that use a cloaking Device (a capability Pirate ships have) are unaffected by the field produced by a GRAF Shield, as the shield's targeting sensors act like light waves. Algernon summarizes the limitation as: "they can't hit what they can't see". Since this discovery, all the ships in the Exofleet were upgraded with this device.