NOTE: The compass is currently not available on iOS devices since there is no implementation in the RoboVM - backend yet. The compass appears to be present with the Intel MOE backend on iOS.

Once you determined that the compass is indeed available, you can poll its state:

• The azimuth is the angle of the device’s orientation around the z-axis. The positive z-axis points towards the earths center.
• The roll is the angle of the device’s orientation around the y-axis. The positive y-axis points toward the magnetic north pole of the earth while remaining orthogonal to the other two axes.

Here’s an illustration of the axis relative to the earth.

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