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    Re: Magnetic variation changing faster than anticipated
    From: Tony Oz
    Date: 2019 Feb 28, 00:24 -0800

    David, the sextant with polarised filters - used as a direction/orientation device - should be pointed upwards at 90° away from the position of Sun. It is there the sky illumination has maximum of polarisation (most contrast between the P-filter sections). No magic in that.

    I just wanted to know if one could do temporary course shifts - specifically to see the Sun. I read that the wind set and drift could be measured by flying a +45°(for 2 minutes)_-90°(for 2 minutes)_+45° track.

    Regards,

    Tony

    60°N 30°E

       
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