Auto-Plotted Jumps
For unknown reasons, automated jumps are prone to an increased risk of misjump. A jump plotted by the automatic systems without the involvement of a sentient astrogator is subject to the same DM-4 as all other fully automated actions. For this reason, if just one skilled crewmembers is carried it is usually an astrogator. A jump plotted in semi-automatic mode by someone without the Astrogator skill but with a basic understanding of the concepts involved suffers DM-2. It is thought that a machine will produce several apparently equal solutions to the same jump plot and cannot distinguish between them but a sentient mind somehow ‘feels’ which one is slightly better than the others. Even someone who is not a trained astrogator can do this to some extent and if one is available they can oversee the plot. Their Astrogator skill applies in this case and the DM-2 is not suffered.
Attempting to send a ship through jumpspace without people on board enormously increases the risk of misjump, for reasons unknown. In addition to the DM-4 for the autoplot, a vessel suffers an additional DM-4 if there are no conscious minds aboard. Lowberth passengers are by definition not conscious and experiments with highly intelligent but non-sentient minds have produced wildly differing results.