PANS-AIM requires the magnetic variation for all radio navigation aids without limitation to a particular type of navaid (see chapter 5.3.3.1 and ENR 4.1). However, PANS-AIM Appendix 1 requires the magnetic variation only for ILS and NDB.
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| title | PANS-AIM issue |
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1 (Aeronautical Data Catalogue) requires the magnetic variation only for ILS and NDB.
In AIXM 5, the magnetic variation is coded on the specialised classes of the abstract NavaidEquipment class (see also topic Navaid Equipment).
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In addition, PANS-AIM requires, for ILS Localiser and NDB, the accuracy to be provided. For both a accuracy of 1 degree is required. In AIXM, the magneticVariationAccuracy attribute is used to code that information.
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| For some Navaids (viz. VOR, ILS and MLS), PANS-AIM requires a station declination instead of a local magnetic variation (see corresponding specialised navaid equipment topic for details). |
Coding Rules for Magnetic Variation for Navaid
TBD
Coding Examples
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Coding Examples
Coding examples can also be found in the AIP Data Set - Specimen (DONLON):
| No. | Description | XPath Expression |
|---|---|---|
NDB-EX-01 | NDB (with magnetic variation coded) | //aixm:NDBTimeSlice [@gml:id ='NDB_DON'] |
NDB-EX-02 | NDB (with magnetic variation unknown) | //aixm:NDBTimeSlice [@gml:id ='NDB_KL'] |
See also topic Navaid [NAV].