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The Navaid.purpose attribute is used to indicate the intended usage of the navaid i.e. 'ENROUTE' (E) or 'TERMINAL' (A) or 'BOTH' (AE i.e. dual purpose).
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In an AIP the purpose of a navaid is |
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published in section GEN 2.5 List of Radio Navigation Aids.
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In addition navaids published in ENR 4.1 Radio navigation aids — en-route will be used 'ENROUTE' per definition. On the other hand navaids published in AD 2.19/AD 3.18 Radio navigation and landing aids are per definition of 'TERMINAL' usage.
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This association is established via the Navaid.servedAirport property, i.e. not the individual navaid equipment is related to the airport/heliport but the whole navaid system (e.g. the VOR/DME and not the VOR and the DME).
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In an AIP navaids that serve an airport/heliport are published in section AD2.19 /AD 3.18 Radio navigation and landing aids.
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Runway Direction Served
This information is not required by PANS-AIM as minimum/conditional data of the AIP data set (but it is listed in PANS-AIM Appendix 1). Landing aids, such as an ILS, which in AIXM 5 is coded as an istance of the Navaid class will be related to a RunwayDirection via the Navaid.runwayDirection property.
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Coding Examples
See topic Navaid [NAV] and sub-pages of topic Navaid Equipment.