RAWS-P Remote Automated Weather Station
FIGURE 9.3-2. A Declination Angle East of True North (Positive) is
Subtracted from 360 (0) degrees to Find True North
FIGURE 9.3-3. A Declination Angle West of True North (Negative) is
Subtracted from 0 (360) degrees to Find True North
9.3.2 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 9.3-4 shows an
example for Logan, UT.
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Summary of Contents for RAWS-P
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