{HEAD ~ The current location} of the array may be compared to {TAIL ~ a reference point} to derive at trajectory directing the user to the reference point, such as an originating point 
compared to
{ HEAD ~ The current location } of the array may be compared to { TAIL ~ a reference point } to derive at trajectory directing the user to the reference point , such as an originating point
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH