receiving {HEAD ~ an indication} from the second wireless communications device that the second wireless communications device has reached a waypoint and sending the path data for a successive segment to the second wireless communications device in response to receiving {TAIL ~ the indication} 
receiving { HEAD ~ an indication } from the second wireless communications device that the second wireless communications device has reached a waypoint and sending the path data for a successive segment to the second wireless communications device in response to receiving { TAIL ~ the indication }
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL