There's a bunch of information here:
http://www.ngdc.noaa.gov:80/seg/potfld/magmodel.shtml
It includes a software program called geomag where you can input date (year
1995 to 2000), the elevation, and the lat/long.
I've used a web site somewhere that let's you plug in the lat/long and
gives you the current declination, but I can't find it in my bookmarks...
73 Tom
P.S. Found the online calculator for magnetic declination (and other related
parameters):
http://www.ngdc.noaa.gov:80/cgi-bin/seg/gmag/fldsnth1.pl
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