Hi EMDK,
I am a dealer for Xitron products here in Germany and I have to say that the Navigator RIP comes with no specified plug-in for Heidelberg Suprasetter models. You will need the " TIFF-B Import" enabled (photo attached) in the MetaDimension / Prinect workflow or Heidelberg "MetaShooter" / "Prinect Shooter" softwares for accepting 1bit-TIFF files from Navigator.