NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Irv Haworth
Date: 2009 Nov 11, 17:35 -0800
From:
navlist@fer3.com [mailto:navlist@fer3.com] On Behalf Of James
N Wilson
Sent: Wednesday, November 11, 2009 5:08 PM
To: navlist@fer3.com
Subject: [NavList 10569] Re: AP terminology, WAS: 2-Body Fix -- take
three
Jim
I am assuming you are replying to a question by a novice
navigator ?
Might I re-phrase your reply slightly ..yes the AP is chosen
closest to DR position (there is a small proviso- rule) in order to use the
tabulated short methods for site reduction such as HO214 , HO 249 HO
229.
Probably better to phrase the last part with “ using a
calc. / computer or HO211 (Ageton) one uses the actual DR position as
the entering arguments….. to reduce the sight.
Hope you don’t mind my 2 cents worth
Irv Haworth
I have too often created more confusion in attempting to
answer questions, but I'll try again. The Assumed Position is merely a
convenience for the use of tables to reduce sights. It is chosen near the DR,
and is commonly selected to make a table entry a whole number of degrees. With
calculator or computer solutions, there is no need for an AP. Nor was there
with Ageton.
Jim Wilson
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