The processor 208 determines the position of the device with respect to {HEAD ~ the origin} by cumulating {TAIL ~ the movement data} received from the movement module 202  
The processor 208 determines the position of the device with respect to { HEAD ~ the origin } by cumulating { TAIL ~ the movement data } received from the movement module 202
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH