On 11/11/98 Greg Milsom wrote,
Today I learned that one of the reasons my new dial was not as exact as
I had hoped was because the magnetic variation I was using to align the
dial was several years old and that magnetic variation does in fact
change over time. I am now searching material on the
The magnetic declination changes slowly with time. The Geological Survey of
Canada's on-line magnetic declination calculator gives for your coordinates:
1995 10d 11m W
1998 10d 22m W
2000 10d 30m W
You can get a DOS or Windows program for do-it-yourself use at
http://geomag.usgs.gov/
--
