The emergency transceivers can be capable of {HEAD ~ transmission} of {TAIL ~ spread spectrum encoded messages}, and can be actuated by a user to send a distress message 
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The emergency transceivers can be capable of { HEAD ~ transmission } of { TAIL ~ spread spectrum encoded messages } , and can be actuated by a user to send a distress message
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH