Figure 21 WXT530 North Arrow
W
ind dir
ection can be referred either to true North, which uses the Earth’s geographic
meridians, or to the magnetic North, which is read with a magnetic compass. The magnetic
declination is the dierence
in degrees between the true North and magnetic North. The
source for the magnetic declination should be current as the declination changes over time.
Figure 22 Sketch of Magnetic Declination
Chapter 4 – Installation
47
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