NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Amelia Earhart's aerial navigation
From: Gary LaPook
Date: 2009 Nov 16, 01:18 -0800
From: Gary LaPook
Date: 2009 Nov 16, 01:18 -0800
1. he most likely used a Pioneer octant similar to the A-5 and A-7 but there is no record to prove this. See http://www.fer3.com/arc/imgx/A-5-Manual.pdf 2. TIGHAR claims that he also carried a marine sextant . They base this claim on a letter Noonan had sent to Weems describing the equipment carried on the much larger Pan Am Clippers and there is no reason to believe that he carried one in the much more limited Electra. 3. I decided to do some more checking on the accuracy of Google Earth coordinates to make sure they were accurate in the Pacific. I found the published coordinates of Mili airport, 6� 05' N, 171� 44'E; Mujuro airport, 7� 03' 44'' N, 171� 16' 19" E; and Kosrae airport, 5� 21' 25" N, 162� 53' 30"E since these were the closest to Howland. Then going to them with Google Earth I found that the Google Earth coordinates were exactly right, correct to the accuracy of the positions given in the airport database. Mili was only given to the nearest minute but the others were to the second. ( A second is only 100 feet!) You can check for yourself, just go to Google Earth with those coordinates which you will see fall on the runways. The only coordinates that have any relevance are those for where Howland is actually located, which we now know to a high level of accuracy, and the coordinates known to Noonan that he was aiming for. The difference, if any, would be the size of any built in error in following the LOP to the island. If Noonan was using the 176� 43' W value then he was aiming about five or five and a half NM west of the western shoreline of Howland. If he was using the 176� 38'W value he was aiming within one half mile of the shoreline. Either way they should have been able to see the island. frankreed@HistoricalAtlas.com wrote: > I thought it might be interesting to get a conversation going about Amelia Earhart's navigation --really Fred Noonan's navigation-- on their ill-fated circum-navigation back in 1937. There's a movie opening this week, "Amelia", produced by and starring Hilary Swank as Earhart. It's getting beat up pretty bad in the early reviews (currently at a dismal 22% fresh on RottenTomatoes.com: http://www.rottentomatoes.com/m/amelia_2009/), but I'm sure many of us will see it eventually. > > So... I know next to nothing about their navigation. Gary Lapook knows lots, and I expect I'm setting you up for some typing, Gary. :-) > > I'll just start off with some basic questions: what kind of sextant did they carry on that flight? Did they have multiple instruments? Were their different instruments during various legs of the flight? At what altitude would sights have been taken (or did it matter)? I remember a discussion a few years ago of a proposed theory claiming that Noonan didn't understand the correction for the Moon's parallax... that theory struck me as pretty light-weight at the time. Can we dismiss it? Did Earhart herself know any celestial navigation? > > Thanks in advance to any and all who can fill me in on this. > > -FER > PS: Hey, Gary: when you visited Mystic back in 2008, did you get a chance to drive by the house where Amelia married George Putnam in Noank? > > > > > > > --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList+@fer3.com -~----------~----~----~----~------~----~------~--~---