High Quality Content by WIKIPEDIA articles! The Saturn Launch Vehicle Digital Computer (LVDC) was one of the major components of the Instrument Unit fitted to the S-IVB stage of the Saturn V and Saturn IB rockets. Its primary role was to provide an autopilot for the Saturn from launch to orbit insertion, but it also supported pre- and post-launch checkout of the Saturn hardware. (For high-resolution photos of components, see the SpaceAholic collection of Apollo Lunar Module and Saturn V spaceflight artifacts)