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