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