var magneticSensor = webapis.sensorservice.getDefaultSensor("MAGNETIC");

		function onGetSuccessCB(sensorData) {
		    console.log("X axis : " + sensorData.x);
		    console.log("Y axis : " + sensorData.y);
		    console.log("Z axis : " + sensorData.z);
		}

		function onerrorCB(error) {
		    console.log("error"+error);
		}

		function onsuccessCB() {
		    console.log("start");
		    magneticSensor.getMagneticSensorData(onGetSuccessCB, onerrorCB);
		}

		magneticSensor.start(onsuccessCB);