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