Campbell FW05 Manual Pagina 55

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Appendix A. CSAT3 Orientation
A-3
A.2 Online Magnetic Declination Calculator
The magnetic declination calculator web calculator published by NOAA’s
Geophysical Data Center is available at the following url:
www.ngdc.noaa.gov/geomagmodels/Declination.jsp.
After the web page loads,
enter the site zip code, or longitude and latitude, then click on the “Compute
Declination” button (FIGURE A-4).
FIGURE A-4. USGS web calculator
The declination for Logan, UT is 12.4 degrees (3 June 2010). As shown in
FIGURE A-4, the declination for Utah is p
ositive (east of north), so true north
for this site is 360 – 12.4, or 347.6 degrees. The annual change is -7
minutes/year or 7 minutes west per year.
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