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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,
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