The Arakyd Nightshadow anti-sensor coating is a sensor-deflecting material placed on the hull of a starship to avoid detection. Sensor baffling coating is frequently used on military scout ships to help avoid detection, but civilian vessels coated with sensor baffling are often treated as suspicious vessels by spaceport authorities, making the baffling good for space runs but not as good for maintaining a low profile in legitimate ports. A starship with sensor baffling can make Stealth checks to hide even without cover or concealment. However, if a ship moves a distance of more than its speed in one turn, this benefit is lost as the energy emitted by the ship’s engines negates the sensor baffling advantage.

Source: Scum and Villainy, p. 61.