{HEAD ~ Reference data} of one or more runways located in the scene may be received from {TAIL ~ one or more reference data sources} 140 
{ HEAD ~ Reference data } of one or more runways located in the scene may be received from { TAIL ~ one or more reference data sources } 140
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH