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    Re: Navagation indland
    From: Tom Sult
    Date: 2017 Jul 29, 17:41 -0500
    John
    Agree. I was talking about the general case of using some random distant object. If you are using a fixed point even if not level you could do the math and back figure your dip up or down, more or less. 

    Tom Sult, MD
    Author: JUST BE WELL (goo.gl/jUbWIX)

    On Jul 29, 2017, at 14:13, John D. Howard <NoReply_Howard@fer3.com> wrote:

    Tom,

    With all due respect, I think you are wrong about using distant land objects for cell nav.  It is true that if an exployer, on the move, does not know where he is that an artifical horizion is the only way.

    But, when you know where you are, either by map or GPS, than you can sight on objects that are at your height of eye.  In my backyard, in Nebraska, there is a small area I go to to do my practice sights.  Using a surveyor's level I have marked on my barn, my silos, and my house horzonital lines that I use as my horizon.  No correction for dip.  Star sights are done by a flashlight on the line.

    My practice sights are compared to my known position and are very close - as good as I did when in Hawaii on the beach.

    John H.

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