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    Re: Sextant/3 Arm Or Gyro Bearing Pmp Plot
    From: Andr?s Ruiz
    Date: 2010 Nov 25, 12:28 +0100

    See: NP 100 Extracts from THE MARINER’S HANDBOOK Edition 1.1 – December 2009

    http://www.ukho.gov.uk/productsandservices/paperpublications/documents/np100%20edition%209%202009.pdf

     

    I have attached p87&88

    Horizontal sextant angles

    11.8

    Where great accuracy in position is required, such

    as the fixing of a rock or shoal, or adding detail to a

    chart, horizontal sextant angles should be used when

    practicable. The accuracy of this method, which

    requires trained and experienced observers, will

    depend on the availability of three or more suitably

    placed objects. Whenever possible about five objects

    should be used, so that the accuracy of both the fix

    and the chart can be proved.

    A horizontal sextant angle can also be used as a

    danger angle when passing off–lying dangers, if

    suitably placed marks are available. This method

    should not be used where the chart is based on old or

    imperfect surveys as distant objects may be found to

    be incorrectly placed.

     

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