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    Re: AP terminology, WAS: 2-Body Fix -- take three
    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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