Magnetic Declination At 2012.5 (Degrees Relative To True North, Positive Is East; C-2. Declination Angles East Of True North Are Subtracted From 0 To Get True North - Campbell 05103 User Manual

Appendix C. Wind Direction Sensor Orientation
C-2
Figure C-1. Magnetic Declination at 2012.5 (degrees relative to true north,
positive is east)
Figure C-2. Declination Angles East of True North Are Subtracted From 0
to Get True North