Table 25: Analysis of the accuracies reported by the Android library using the accelerometer and the magnetometer sensors.

Stages	Accelerometer Magnetometer	Accelerometer Magnetometer Microphone	Accelerometer Magnetometer Microphone GPS
Stage 1	86.49%	86.49%	86.49%
Stage 2	-	45.68%	45.68%
Stage 3	-	100.00%	100.00%
Overall	86.49%	58.34%	67.26%