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Re: Looking for references on "aiming off"
From: Jackie Ferrari
Date: 2010 Sep 10, 21:13 +0100

Captain Marius Lodeesen a friend and student of Noonan discusses this on p 113 of his book 'Captain Lodi Speaking ' addressing what could have gone wrong on the Lae to Howland leg. He says that Noonan was probably well to the north of the track owing to procession of the gyrocompass. If , unable to get a fix he then aimed off North putting him even further away from Howland.

I once got to wondering just how far north he would have had to have been off track and things like optimal distances from the destination and angles for aiming off, to minimise the danger arising from this, but gave up not being of a mathematical bent! I would be very interested therefore in anything you come up with and will be following this thread closely.

Jackie.

----- Original Message -----

From: mjans

To: NavList@fer3.com

Sent: Friday, September 10, 2010 2:20 PM

Subject: [NavList] Looking for references on "aiming off"

I'm a PhD student and am working on a paper quantifying when and by how much to aim off. Can anyone point me to any references on the subject? For instance from [NavList 10886]:
"Noonan could be expected to have known this technique since he knew Weems and Chichester had popularized in 1931."

How did they do that?

Has anyone heard of off-aiming in maritime navigation, perhaps under a different name?

Thank you very much.
Tom Temple,
Ph.D Candidate,
Laboratory for Information and Decision Systems,
Massachusetts Institute of Technology

At the moment, my results are still preliminary but I would be happy to share them with anyone who is interested.

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