In {TAIL ~ another embodiment}, {HEAD ~ reference data} could be provided by the flight navigation database 144 
In
In { TAIL ~ another embodiment } , { HEAD ~ reference data } could be provided by the flight navigation database 144
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH