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Introduction & Background
For Radio navigation aid, PANS-AIM requires some basic properties as part of the minimum AIP data set. These are
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A Navaid.type equal-to 'ILS' may be composed of e.g. four NavaidEquipment, a Localizer, a Glidepath and two MarkerBeacon (one middle and one outer Markermarker).
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Navaid
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Navaid Purpose
This information is also not required by PANS-AIM to be provided . However, for the scope of a data set content and publication reasons it may be relevant to code that informationas minimum data item but is considered conditional.
The Navaid.purpose attribute is used to indicate the intended usage of the navaid, i.e. 'ENROUTE' (E) or 'TERMINAL' (A) or 'BOTHALL' (AE i.e. dual purpose).
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Navaids of type VOR, DME, NDB, TACAN and Marker with purpose Aerodrome (A or AE) or used for terminal procedures including e.g. ILS (generally published in AIP section AD 2.19/3.18) will be assigned to one (or more) AirportHeliport.
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In an AIP, navaids that are situated at a runway direction are published in section AD 2.19 / AD 3.18 Radio navigation and landing aids.
Significant Point
in In AIXM 5, the instance of a Navaid class is related to the SignificantPoint class (see also topic SignificantPoint [SPN](Overview)). The Significant point may be used as start or end point of a route or terminal procedure, or the centre point of a TAA/MSA, to describe the horizontal border of an airspace, etc.
Hence, navaids that are used as significant point have to be encoded using the Navaid class, whereas other navaids may be just encoded as NavigationEquipment (e.g. a marker beacon that is part of an ILS installation ).
Coding Rules for Basic Data for Navaid
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The Enroute NDB NAVAID file (DB) contains all enroute on-airway and off-airway
NDBs within the geographical area of interest. The Terminal NDB NAVAID file (PN)
contains NDBs associated with the Airports contained in Subsection 3.2.4.1 and
Heliport contained in Section 3.3.3.
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| In case it is the same as the NavaidEquipment.name, shall it be encoded for both? |
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| In case it is the same as the NavaidEquipment.designator, shall it be encoded for both? |
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Minimum AIP data set (for Airport)
PANS-AIM (Runway Direction)
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| Should purpose be mandatory? |
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| E.g. For an ILS should both be coded ? |
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or a DME that is part of a VOR/DME).
Coding Examples
See topic Navaid [NAV] and sub-pages of topic Navaid Equipment.
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