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    Re: Magnetic Variation
    From: Bill Morris
    Date: 2010 Mar 1, 17:26 -0800

    But it seems that there is indeed seasonal variation and diurnal variation in the Earth's magnetic field. See for example:

    Exploration Geophysics 29(4) 428 - 432 (1998) doi:10.1071/EG998428

    No doubt it is of no significance for navigators, except in polar regions, and probably should not have put in an appearance in a test of navigational knowledge.

    Bill Morris
    Pukenui
    New Zealand

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