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. 2014 Oct 4;200(12):983–996. doi: 10.1007/s00359-014-0947-6

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© The Author(s) 2014

Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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Fig. 2 — Properties of the 3D magnetic sensor (MS) under a rotation around the Z axis. The sensor was placed horizontally and rotated manually around the Z axis in 10° steps while recording its three outputs. As expected, the X (asterisk) and Y (filled circle) outputs were in quadrature while the Z (filled triangle) output was almost constant. The total magnitude of the recorded field was 5 % lower (gray line) than the theoretical value of the earth’s magnetic field (EMF) at Santiago according to the NOAA-WMM 2010 model (dotted line)