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B.1 Online magnetic declination calculator
The magnetic declination web calculator published by NOAA’s Geophysical Data Center is
available at
. 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 (
(p. 17)). Click the Calculate button to get the magnetic declination.
FIGURE B-4. NOAA web calculator
(p. 18) 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.
WindSonic4 Two-Dimensional Sonic Anemometer
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