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A service providing guidance information or position data for the efficient and safe operation of aircraft supported by one or more radio navigation aids.
In PANS-AIM this is actually the definition for "Radio navigation service".
However, in AIXM 5 a Navaid is composed of one or more NavaidEquipment.
The navaid.type attribute is used to code the type of the navaid (actually the service provided by one or more radio navigation aids).
In AIXM 5 a Navaid is composed of one or more NavaidEquipment.
Some examples:
A Navaid.type equal-to 'VOR' is composed of one NavaidEquipment which is a VOR.
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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).
In an AIP the purpose of a navaid is publishe in section GEN 2.5 List of Radio Navigation Aids.
In addition navaids published in ENR 4.1 Radio navigation aids — en-route will be used enroute per definition. On the other hans hand navaids published in AD 2.19/AD 3.18 Radio navigation and landing aids are per definition of terminal usage.
Navaid Designator & Name
A Navaid.designator is used to provide the coded identifier given to the navaid system.
It is limited to 4 characters, which may be upper case alpha and/or digit characters.
Depending on the specialised NavaidEquipment different concepts and rules for the navaid designator may be applied (see also specialised navaid equipment topics).
The Navaid.name is used for the long name given to the composite navaid.
Magnetic Variation
PANS-AIM requires the magnetic variation for all radio naviagtion aids without limitation to a particular type of navaid. However, PANS-AIM Appendix 1 requires the magnetic variation only for ILS and NDB.
in AIXM 5 the magnetic variation is coded on the Navaid class. Several attributes are used.
The magneticVariation attribute is used to provide the angular value of the magnetic variation. The value of an angle (at a given point) between the direction of Magnetic North and the direction of Geographical North. The value range allowed by AIXM is between -180 and 180 degrees. A positive value indicates that Magnetic North is East of Geographical North. A negative value indicates that Magnetic North is West of Geographical North.
The dateMagneticVariation is the year on which an associated magnetic variation was measured.
In addition, PANS-AIM requires (for ILS and NDB) the accuracy to be provided. In AIXM the magneticVariationAccuracy attribute is used for that purpose.
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| For some Navaids (viz. VOR, ILS and MLS) PANS-AIM requires a station declination (see corresponding specialised navaid equipment topic for details). |
Coding Rules for Basic Data for Navaid
TBD
Coding Examples
See topic Navaid [NAV]
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