Some unusual research requests have come across the transom lately.
In a land dispute, a wilderness property was referred to using map coordinates and compass bearings. I found the correct map, but I needed to know the Magnetic Declination on the date of the compass bearings. Magnetic declination is the angle between magnetic North (the direction the north end of a compass needle points) and true north (the direction along the earth’s surface towards the geographic North Pole).
The Magnetic Declination Calculator for Canada may be found at http://geomag.nrcan.gc.ca/calc/mdcal-eng.php. While the U.S Magnetic Declination Calculator may be found at http://www.ngdc.noaa.gov/geomagmodels/struts/calcDeclination.