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    Re: Problems with AstronavPC
    From: Jim Thompson
    Date: 2004 Feb 16, 16:32 -0400

    I'm new to CN, but isn't the only reason that we try to keep the AP within
    30 NM of the intercept for convenience in plotting?  In theory we don't even
    need an AP: with the right tools (electronic would be the only practical
    way) we just need the GP of the Body, Azimuth to the GP, and co-altitude
    (distance to the LOP from the GP).  In that special case, the intercept is
    the co-altitude, which of course tends to be many hundreds or even thousands
    of miles away from where we are on the celestial LOP.  All a computer would
    have to do is produce data that we need to plot a short segment of the LOP
    and the intercept on a large-scale plotting sheet; specificaly a reference
    point on the plotting sheet, a bearing line to draw toward or away from that
    point, and the distance from that point to the LOP along the bearing line.
    
    I know -- that "reference point" is the same concept as an AP.  But is there
    any other reason why we need to select an AP relatively close to our real
    position?
    
    Jim Thompson
    jim2{at}jimthompson.net
    www.jimthompson.net
    Outgoing mail scanned by Norton Antivirus
    -----------------------------------------
    
    > -----Original Message-----
    > From: Navigation Mailing List
    > [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM]On Behalf Of Aubrey
    > O'Callaghan
    >
    > I then placed my initial position nowhere near where I was. After about 3
    > iterations it converged to my actual position. I was quite surprised as I
    > had thought that one's initial guess should be approximately where one is
    > (at least within a few degrees).
    
    
    

       
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