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    Re: Navigation without dead reckoning
    From: Thomas Kleemann
    Date: 2007 Dec 23, 19:06 +0100

    Sara and Dan schrieb:
    > I am new to this navlist and any help would be appreciated.
    >
    Welcome at NavList.
    >
    > My problem is that since I am not traveling in a straight line at a
    > constant speed it is not possable to calculate a
    > dead reckoning point.
    >
    
    St Hillaire is an iterative algorithm.
    So if you use any coordinates at just the right hemisphere you will get
    a fix nearer to your true position. Using this as your corrected D.R.
    and computing another iteration gives you again a better fix.
    
    >
    > My thought is that there ought to be a way to get accurate enough
    > coorinates by taking several noon sightings of the sun, graphing them
    > and picking the highest point and using this time as local apparent noon
    > to get longitude and using
    > the observed altitude to get latitude.  If  I take these coordinates and
    > use them as my dead reckoning position for later
    > readings I think that this would yeald fairly accurate results.
    >
    You are right here.
    Even tough it is not possible to get the exact time of the culmination
    by observation, it will provide you with coordinates accurate enough for
    a fairly precise D.R.
    
    Merry Chrismas,
        Thomas.
    
    
    
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