A sensor jammer interferes with radar and enemy sensor scans. It also confounds missile guidance systems.
Sensor checks made against a ship with an active sensor jammer take a -5 penalty. In addition, the ship gains one-half concealment against missile attacks (20% miss chance).
Any ship with a Class III sensor system (or better) is not subject to the effects of the sensor jammer, ignoring the penalty and the miss chance.
Purchase DC: 5 + one-half the hull purchase cost of the starshp.