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Magnetic declination = 1.3 deg E

sonic: Vazimuth = azimuth(magnetic) measured + declination - 90 (

Vazimuth is the direction that the sonic V axis is pointing), and is the rotation angle of horizontal wind components from instrument to geographic coordinates.

prop: azimuth = azimuth(magnetic) measured + declination + 180

prop azimuth is the angle that is added to the wind directions measured by the propvane, so that they are relative to true north.