I can't tell whether your comments were directed specifically at me BEagle, but I'll answer them anyway. Firstly I don't have any devices capable of producing a magenta line, as I actually quite enjoy dead reckoning. So yes, paper chart all the way for me. As for it being taught at PPL level: yes, I'm sure the answer is most likely to be in the green Air Navigation textbook. Perhaps I should have just re-read the relevant chapter rather than bothering PPRuNe with "something this basic"!