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