That's interesting Ormeside. Those of you who have read Fate is the Hunter (and I'm assuming it's most of you) will recall the bits where Gann goes back to keep his hand in at shooting some astro, which he also computed and plotted himself. I came to the conclusion he was probably a better navigator than I ever was, as well as the small detail of also being a highly accomplished pilot. Set against that, some pilots I have known would have had difficulty in finding their own way out to the aircraft without help!