The training apparatus 1 wherein each of said at least one transceiver is {HEAD ~ an ultrasonic transceiver} and each of said at least one reflector is {TAIL ~ an ultrasonic reflector} 
The training apparatus 1 wherein each of said at least one transceiver is { HEAD ~ an ultrasonic transceiver } and each of said at least one reflector is { TAIL ~ an ultrasonic reflector }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL