SimplifiedDirectionalFacility
urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:SimplifiedDirectionalFacility
A radio navigation aid providing a final approach course similar to, but less precise than, that of the ILS localizer.
Source:
EUROCONTROL-FAA AIXM v.5.1,
Abbreviations:
SDF