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It's true that variation changes year-to-year.  But the amount of change
is usually a tiny fraction of a degree per year.  A massive movement of
the magnetic pole would require variation to change much more than that
(and require those of us who ignore that label in the rose to pay
attention!).

BTW, some not-too-old introductory navigation texts show the isogonic
line (the line of zero variation) as running just west of the west coast
of Florida.  I understand that it's now moved significantly west and
runs up the Mississippi/Alabama border.

Lu Abel

YANNI'S MARINE wrote:
> Hey Andrew,
> The magnetic pole has always been changing. When you look at your charts
> check the center
> of any compass rose. It tells you what year was the last change on the
> chart's compass rose
> and how much (is the Variation) it changes every year thenon. When you
> convert your compass reading to true
> you have to subtract west or add east variation to get to your true course.
>
> True - Variation - Magnetic - Deviation - Compass
>
> (I hope I am not offending anyone)
>
> Yanni
> Marinated
> S/V Princess Thalia
> Hamilton
>
>     ----- Original Message -----
>     *From:* Andrew Corl 
>     *To:* NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
>     
>     *Sent:* Friday, December 09, 2005 9:52 AM
>     *Subject:* Earth's Magnetic Pole Shifting
>
>     I found this on AP Science today.  It is interesting, and I am sure
>     that this will affect our estimated position and compass work in the
>     next several decades.  I am not sure how we factor this in, and am
>     wondering if anyone has observed this effect in their work.
>
>
>
>     http://news.yahoo.com/s/ap/20051209/ap_on_sc/earth_magnetic_pole
>
>
>
>
>
>     Andrew Corl
>
>
>

   

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