The transmitter can be operatively coupled to the receiver to transmit a spread spectrum encoded ranging command in {HEAD ~ response} to {TAIL ~ a received distress message} 
to
The transmitter can be operatively coupled to the receiver to transmit a spread spectrum encoded ranging command in { HEAD ~ response } to { TAIL ~ a received distress message }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL