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RAWS-H Remote Automated Weather Station

8.1.2 USGS Web Calculator

The USGS provides an easy way of determining declination of a specific site.

Since magnetic declination fluctuates with time, it should be adjusted each time

the wind sensor orientation is adjusted. The calculator can be accessed at:

www.ngdc.noaa.gov/geomagmodels/Declination.jsp

. Figure 8.1-4 shows an

example for Logan, UT.

FIGURE 8.1-4. USGS Web Calculator

In the example above the declination for Logan, UT is 12º 24′ or 12.4º. As

shown in Figure 8.1-4, the declination for Utah is East (positive), so True

North for this site is 360 – 12.4 = 347.6 degrees. The annual change is 7

minutes West per year or -7 minutes/year.

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Campbell RAWS-H Remote Handbuch Seite 24