Campbell FW05 Manual descarregar pdf (Página 55)

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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Campbell FW05 Manual Página 55