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