In some embodiments of the invention, {HEAD ~ a locator transceiver} can include {TAIL ~ a receiver} and transmitter 
include
In some embodiments of the invention , { HEAD ~ a locator transceiver } can include { TAIL ~ a receiver } and transmitter
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH