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en.wikipedia.org/wiki/Magnetic_declination

Magnetic declination or variation is the angle on the horizontal plane between magnetic north and true north (the direction along a meridian towards the ...

www.ngdc.noaa.gov/geomag/declination.shtml

Magnetic declination, sometimes called magnetic variation, is the angle between magnetic north and true north. Declination is positive east of true north and ...

ngdc.noaa.gov/geomag-web

Declination is calculated using the most recent World Magnetic Model (WMM) or the International Geomagnetic Reference Field (IGRF) model. For 1590 to 1900 ...

www.rei.com/learn/expert-advice/compass-declination.html

Mar 20, 2017 ... What's the difference between magnetic north and true north and why is it important to navigation? Learn what declination is and how to adjust ...

www.compassdude.com/compass-declination.php

Learn about magnetic declination effecting compass directions.

www.magnetic-declination.com

Find your location or click on the map to display your magnetic declination, Browse countries What is Magnetic Declination?

www.thecompassstore.com/decvar.html

Magnetic declination adjustment values are easy to determine with these helpful map charts and page links.

education.usgs.gov/lessons/compass.html

May 2, 2017 ... How to adjust the magnetic declination on a compass and orient it with a USGS topographic map.