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