Compass.rawVector
var rawVector: Vector3;
Description

The raw geomagnetic data measured in microteslas. (Read Only)

The compass is actually a magnetometer that measures the magnetic field in the device's XYZ coordinates - in the absence of a stronger magnet, it will measure the Earth's field from which the compass heading can be found. This property can be used if you want to make non-standard use of the compass (eg, find the heading from the X or Z axis of the device).
	function OnGUI() {
		GUILayout.Label("Magnetometer reading: " + Input.compass.rawVector.ToString());
	}