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A-1
Appendix A. Determining True North
and Wind Sensor Orientation
The orientation of the WindSonic “North Arrow Markers” is found by reading
a magnetic compass and applying the site-specific correction for magnetic
declination; where the magnetic declination is the number of degrees between
True North and Magnetic North. Magnetic declination for a specific site can be
obtained from a USGS map, local airport, or through a NOAA web calculator
Online Magnetic Declination Calculator
(p. A-3)
). A general
map showing magnetic declination for the Conterminous United States is
shown in FIGURE
FIGURE A-1. Magnetic declination for the conterminous United States
(2015)