Traveller has a set of four or five tutorials that turn up here and there, and they are superb. After flailing around for more than a year, I read them and "got it." I think they live at RDNA now, and they may still be at BBay. In fact, I seem to remember that they were linked to R'osity for a while. Trying searching-- No, I forget where we are. Go to the end of the tuts and work your way backwards. I think they date from P3 (which is not problem, because magnets haven't changed much since). M