NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Ebbco in Yonkers
From: Hewitt Schlereth
Date: 2014 Aug 10, 12:32 -0700
From: Hewitt Schlereth
Date: 2014 Aug 10, 12:32 -0700
Boy, nice set of data, Greg. Like these, my best sights in a series tend to be the middle ones. From long habit I usually take only 5 and then average them.
I make note of the IE at the start and finish of the entire round of 5 and use the end one for all. I have to say your practice of noting begin and end for each sight is bound to be better.
Here in San Diego I can only get pm sights, so I set the sun about a semi-diam above the horizon, then back it down to half that and swing away, without moving the drum, till the sun touches the horizon.
FWIW my teaching mnemonic for the Ebbco is - when the thumb on the drum goes down, so does the sun. On the Davis Mk15 it's the opposite, so I say to myself, "knuckles down, sun down." On the Mk3 it's like flying a plane - stick back, nose (sun) up; stick forward, sun down. :-)
On Aug 10, 2014, at 9:26 AM, "Greg Rudzinski" <NoReply_Rudzinski@fer3.com> wrote:
Attached is the data sheet for this mornings Ebbco trials. Spreads have improved to about 3' (good enough). Average intercept at 1.4' (better than good enough).
Attached File:
(Ebbco-Trials.jpg: Open and save)
