a Global Satellite Navigation System receiver for receiving GNSS signals and for generating current position data representing {HEAD ~ a current position} of {TAIL ~ the first wireless communications device} 
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a Global Satellite Navigation System receiver for receiving GNSS signals and for generating current position data representing { HEAD ~ a current position } of { TAIL ~ the first wireless communications device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL