==== Compass calibration button ====
{{Version/AndroidSince|2.4.5}}/{{Version/WinXSince|2.5.4}}
This button can be used in order to calibrate the compass, e.g. for a demonstration use case or if it points in the wrong direction.
When it is clicked, the compass will behave as if the current heading was north(for WinX see [http://wiki.augmensys.com/index.php?title=Settings#tab=WinX| CalibrationHeading] setting). Technically, a compass offset setting is used in the background.
Therefore, in order to use it, do the following:
* Turn the device so it looks at where you want it to believe that north is.