NavList:

"We also know that Noonan always used Dreisonstok (HO 208) for his computations. See his letter to Weems, page 425, "Air Navigation, 1938.""

Gary

Thankyou for the Pointer.  I hadn’t realised I had it right under my nose on pages 357-359 of my 1943 3^rd Edition of Weems “Air Navigation” once owned by Lt James O. Bohuslav.  It must be a different edition to yours because the page numbers are different.  It has about the same amount if ‘foxing’ as yours but a wicked smell of badly stored old books.  Have you any idea how to get rid of the smell. It stops on your hands after use.  You Tube says use baking powder, but I’m not sure about risking it. 

Do you know what Noonan meant by carrying a mariner’s sextant as a ‘preventer’?  Not to hold the cabin door open, I hope.   Maybe to check the anchor was holding while on the water, but you could use a hand bearing compass for that.  Interesting also that Noonan thought 10nm was reasonable accuracy from a star fix in the air.  It makes you realise that expecting to find a coral island of 640 acres and about 10ft vertical extent looking initially into the rising Sun using celestial navigation alone would have been almost impossible and had to rely on a DF homing which for various reasons they didn’t achieve.  DaveP