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    Re: Compass Check
    From: Bill Lionheart
    Date: 2016 Mar 21, 20:05 +0000

    Yes checked azimuth. One neat trick is it turn the boat slowly but within a few minutes. Even if you don't know the azimuth you have the Fourier coefficients for compass correction except  the constant term. Much easier than transits and pelorus. Billĺ

    On 21 Mar 2016 00:35, "Greg Rudzinski" <NoReply_Rudzinski@fer3.com> wrote:

    Bill,

    If you have a GPS position and UT time of image then the reflected Sun or shadow on compass card can be checked with an azimuth reduction. 

    Greg Rudzinski

    From: Bill Lionheart
    Date: 2016 Mar 20, 17:18 -0700

    Took this this morning at 0907 in Hartlepool and thought folks might be interested. There is a huge error as we are next to a massive steel column that secures the pontoon. It should be 306 True 307 Magnetic.



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