PANS-AIM requires the magnetic variation for all radio naviagtion 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 1 (Aeronautical Data Catalogue) requires the magnetic variation only for ILS and NDB.
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PANS-AIM ENR 4.1 requires a magnetic variation idependently form the type. PANS-AIM appendix 1 requires a magnetic varation 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].