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