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