wherein {HEAD ~ the processor} causes {TAIL ~ the transmitter} to transmit the current position data by: 
causes
wherein { HEAD ~ the processor } causes { TAIL ~ the transmitter } to transmit the current position data by :
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH