Click here:
http://www.geolab.nrcan.gc.ca/geomag/e_cgrf.html#MIRP
This program uses the Magnetic Info Retrieval Program with Canadian
Geomagnetic Reference Field for Canada and vicinity. For the rest of
the world, it uses International Geomagnetic Reference Field for the
calculations.
The form requires the year, because of secular variation of the field,
with longitude and latitude plug ins which then provides the declination.
Another site that provides information and downloadable software is:
http://www.cam.org/~gouletc/decl_faq.html#DETERMINE
Jim, K1PX
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