Alternate UV set (SCS)

An UV set (map) is just a definition how a certain texture (skin) is applied to a 3D model. Some SCS vehicles have more than one UV set.

Usually, the first UV map is the regular one where you can simply paint over the whole vehicle model. The second (alternate) UV set usually is mirrored - you paint one half of the vehicle, and your skin is automatically applied to the other half of the vehicle model.