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