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