In addition to current position data, the speed, {HEAD ~ path} and time data facilitate tracking of {TAIL ~ the first wireless communications device} 
of
In addition to current position data , the speed , { HEAD ~ path } and time data facilitate tracking of { TAIL ~ the first wireless communications device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL