Name	Data Type	Definition
type	CodeNavaidServiceType	Type of the navaid service such as ILS, MLS, VORTAC, VOR/DME, etc.
designator	CodeNavaidDesignatorType	The coded identifier given to the navaid system.
name	TextNameType	The long name given to the composite navaid.
flightChecked	CodeYesNoType	Indicates if the navaid has been flight checked.
purpose	CodeNavaidPurposeType	Indication of the intended usage of the navaid (enroute or terminal)
signalPerformance	CodeSignalPerformanceILSType	The signal performance level indicating the precision of an ILS or MLS system.
courseQuality	CodeCourseQualityILSType	An indication of the signal quality of the ILS course structure based on the location the precision signal is usable to.
integrityLevel	CodeIntegrityLevelILSType	That quality which relates to the trust which can be placed in the correctness of the information supplied by the ILS facility.

Association	Multiplicity	Role	To	Role description
isInstalledAt	0..*	touchDownLiftOff	TouchDownLiftOff	The touch down or lift-off area for helicopters.
isComposedOf	0..*	navaidEquipment	NavaidEquipment	the component of the navaid system
isNavigableBy	0..1	location	ElevatedPoint	Graphical location of the navaid (system). This should be the same location as the equipment that provides navigability
isInstalledAt	0..*	runwayDirection	RunwayDirection	The landing and take-off directions of a runway
usedForHomingAt	0..*	servedAirport	AirportHeliport	The AirportHeliport served by the Navaid.
worksBy	0..*	availability	NavaidOperationalStatus	The operational status of the navaid.
hasAnnotations	0..*	annotation	Note

From	Association	Multiplicity	Role	To	Role description
SignificantPoint		0..1	navaidSystem	A navaid used as significant point.
GuidanceService	uses	0..1	navaid	The associated Navaid.

1 - Guidance Service , 1 - Navaid , 1 - Significant Points , 2 - Point Reference , 3 - Route Portion