Sorry, my last reply was a bit flippant.

Use the USGS website, and run the online calculator through your browser.
It requires java installed on your system.

As declination is variable with time, you are asked by the applet to insert
the date, as well as lat/lon and elevation. There are various models that
may be used to calculate the declination.

In some world locations, the models are not a good fit to the real
(measured) declination. 

---
Ian Thomas
GeoSciSoft - Perth, Australia

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