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    Re: Magnetic Variation
    From: Paul Saffo
    Date: 2010 Feb 27, 18:33 -0800
    There is a short description of annual mean field variation on the usgs gromagnetic observatory site. See:

    But the shift is quite small, well below what I would imagine might matter to navigators, so not surprised that Dutton, et. al didn't mention it.
    best
    -p

    On Feb 27, at , Guy Schwartz wrote:

    Hello all:
    I just took a test today and one of the questions had to do with magnetic variation. The answer to the question was that magnetic variation changed seasonally. I checked Chapman’s, Dutton’s and Bowditch, no mention of seasonally adjusting?
    Anyone have any information or was the test wrong?
    Thanks
    Guy
     
     
    "May the SCHWARTZ BE WITH YOU"
     

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