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