The Eryx missile uses a SACLOS guidance system, the launcher tracks a light source on the rear of the missile and compares its position with the center of the launcher's cross-hair, sending corrective signals down a trailing control wire. The missile increases resistance to jamming by having a beacon as the light source on the rear of the missile that pulsates or blinks at a special encoded rate recognized by the Eryx's tracking device located on the launch post. Unlike most wire guides antitank missiles that use SACLOS guidance, which require a complex optical tracker unit that has to zoom from a wide to narrow view in microseconds after the missile is launched (e.g. the MILAN), the Eryx uses one charge-coupled device (CCD) matrix that operate in the IR spectrum, and two fields of view (one narrow and one large) with an automatic switch during missile flight. Again Aérospatiale also states that this unique and simplified SACLOS tracking system provides for a far more cost-effective solution and enable the Eryx to be highly resistant to decoys or jamming and other enemy countermeasures.