{HEAD ~ A locator transceiver} can be capable of receiving {TAIL ~ the distress messages} and performing two way ranging to determine a distance between the locator transceiver and the emergency transceiver 
capable of receiving
{ HEAD ~ A locator transceiver } can be capable of receiving { TAIL ~ the distress messages } and performing two way ranging to determine a distance between the locator transceiver and the emergency transceiver
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH