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