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    Re: Azimuth method for position
    From: Bill Lionheart
    Date: 2017 Oct 20, 17:49 +0100

    It seems to me that the problem of measuring azimuth at sea is two
    fold. First is that even a corrected magnetic compass is only accurate
    to about one degree. Second is devising a sufficiently accurate
    instrument to measure the difference in azimuth between stars.
    If you can solve the second problem you could  devise a least squares
    solution to the problem of fitting the difference in azimuths, and
    indeed of one star was Polaris this would be more or less the same as
    having the absolute azimuth. But to measure the azimuth one still
    needs a horizontal reference of some kind. The question then is if you
    can get away with a less accurate horizontal reference than needed to
    measure altitudes to one minute.
    There is a lot more to this problem that just solving the equations
    with Newton's method on a computer!
    On 20 October 2017 at 15:28, Herman Dekker  wrote:
    > Hello Francis,
    > How does your "specially adapted Az compass " looks like? I have found a
    > compass that is usable till about H=60°. Above that height it is a guess
    > every time.
    > Regards,
    > HermanD
    > View and reply to this message
    Professor of Applied Mathematics
    University of Manchester

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