The NavaidEquipment class is specialised into: Azimuth, DME, DirectionFinder, Elevation, Glidepath, Localizer, MarkerBeacon, NDB, SDF, TACAN and VOR.
The specific coding guidelines for each of the specialised classes are described in the following pages.
A 
NavaidEquipment may be used for more than one Navaid, e.g. a Navaid with type equal-to 'NDB' will be composed of a NavaidEquipment that is an NDB feature. The same NDB may be used as component for a Navaid with type equal-to 'ILS'.
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| Tthe Navaid feature can be used as SignificantPoint (see also topic SignificantPoint [SPN]), whereas the any of the navaid equipments (e.g. VOR feature) can not. Hence, if a particular navaid component of a navaid shall be available a separate SignificantPoint it has to be encoded as separate Navaid feature. |
The following figures show illustrate such situations:
The first case shows a simple example of a VORTAC. The VORTAC will be encoded as a Navaid feature referencing two navaid equipments, a VOR and a TACAN feature.
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All these navaid equipments may might also be used for other purposes than being part of the ILS.
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