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    Re: 'Intentional Error' Method of Navigating to Destination.
    From: Gary LaPook
    Date: 2009 Nov 13, 03:26 -0800
    Don't let Chichester's chart confuse you. The arcs and the rays were his method of determining the wind aloft by estimating his drift on three different headings and do not relate to the celnav.


    Gary LaPook wrote:
    Using the destination as the AP is a very good way to do a single LOP
    approach. If you think about, that is what you are doing when doing the
    ancient latitude sailing, comparing your altitude with what would have
    been measured at the destination. If you use the destination as the AP
    you don't even need to plot the lines, the intercept shows you how far
    you must go to intercept the LOP through the destination and the
    azimuth, plus or minus 90º, tells you which way to fly after the
    interception. If you have a choice of objects you can shoot one on the
    beam which gives you a "course line" LOP and the intercept tells you how
    far you must correct right or left to get on course to the destination
    if you use the destination as the AP.
    I have attached Chichester's chart to Norfolk.
    John Karl wrote:
    For those interested, I describe this method of exploiting special
    orientations of LOPs on page 138 of my book.  I briefly discuss
    Chichester's flight to Norfolk Island, then give an example of a
    sailboat's approach to Midway Island (very low and hard to see at a
    distance from a small boat).
    It's an example of using an AP that has nothing to do with the
    location of any boat.

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