Online magnetic declination calculator

The magnetic declination web calculator published by NOAA’s Geophysical Data Center is available at www.ngdc.noaa.gov/geomag-web . This web page calculates declination based on the latitude and longitude. You can look up your site’s latitude and longitude by entering the Zip Code or the Country and City, and then clicking the Get & Add Lat/Lon button (NOAA web calculator). Click the Calculate button to get the magnetic declination.

NOAA calculated declination using HTML result format shows that the calculated declination for Logan, UT is 11.78 degrees (11 August 2015). The declination for Utah is positive (east of north), so True North for this site is 360 – 11.78, or 348.22 degrees. The annual change is 6 minutes west per year.