Navaid [NAV]

Purpose and Scope

These pages contain the AIXM coding guidelines for the minimum and conditional data items of the AIP data set for the Radio navigation aid subject as defined in PANS-AIM.

AIXM Model Overview

The figure below shows the main AIXM 5 classes used for the navaid concept.

In AIXM 5, a is composed of one or more .Navaid NavaidEquipment

To describe a physical navaid equipment in AIXM 5, the class is used. This class is specialised into: , , , NavaidEquipment Azimuth DME DirectionFinder, , , , , , , .Elevation Glidepath Localizer MarkerBeacon NDB SDF TACAN VOR

AIP context

In an AIP, corresponding Radio navigation aid information may be published in the following sections:

GEN 2.5 List of radio navigation aidsENR 4.1 Radio navigation aids — en-routeAD 2.19/AD 3.18 Radio navigation and landing aids

Some examples:

A may be a NDB which will be composed of just one , viz. a .Navaid NavaidEquipment NDB

A may be a VOR/DME which will be composed of two , viz. a and a .Navaid NavaidEquipment VOR DME

A may be an ILS which will be composed of several , e.g. a , a and one or more or a Navaid NavaidEquipment Localizer Glidepath MarkerBeacon DME.

The relationship between the may be further described by using the class.NavaidEquipment NavaidComponent

The class carries the attributes that are common for the composition of the whole navaid. These are some basic data such as the of the Navaid typenavaid, its and .designator name

In addition, also related to class are the if any, and the of the defined by one or more (see Navaid servedAirport availability Navaid Timesheet Common for details).coding patterns

A Navaid may be used a , e.g. for the start or end point of a route or terminal procedure or the centre point of a TAA/MSA, etc.SignificantPoint

Each will have a location defined by the class. For certain an elevation has to be defined. In this case, the NavaidEquipment Point NavaidEquipment Ele class has to be used (e.g. for ).vatedPoint DME

This location of each of the  of a may be the same (e.g. for a VOR/DME or a NDB collocated with a DME), or different (e.g. for a NavaidEquipment NavaidVOR/DME or the components of an ILS).

Also, the class itself may have a location. This is the location used when the navaid acts as a significant point (see also )Navaid SignificantPoint (Overview). This location is usually the location of one of the navaid equipments (e.g. in case of a VOR/DME it will be in general the location of the VOR).

The may also have a and a , which in general will be the same as the one of the .NavaidEquipment designator name Navaid

In addition, each may have a defined. Only and have also a , i.e. the angular difference NavaidEquipment magneticVariation VOR TACAN declinationbetween True North and the station declination (Magnetic North - as indicated by the station).

Some have a (e.g. VOR or NDB), whereas others have a defined (e.g. TACAN or DME).NavaidEquipment frequency channel

Some have a defined and/or (e.g. the measured angle between the localizer beam and Magnetic/True NavaidEquipment magneticBearing trueBearingNorth at the localizer antenna).

Only the has also a , a code indicating the direction of the 'zero bearing' provided by the station. For example: magnetic north, VOR zeroBearingDirectiontrue north.

The class is also used to code landing systems (e.g. ILS, Localizer only, MLS). It will be comopsed of the corresponding instances of Navaid NavaidEquip e.g. etc.). Finally, the and not its individual components a ment, Localizer, Glidepath, MarkerBeacon, DME, Navaid isInstalledAt RunwayDirection.

A an NavaidEquipment isUnderResponsibilityOf OrganisationAuthority.

Coding Example

The figure below shows a simple example of a collocated "VOR/DME" with the designator "BOZ" and the name "BERG-OP-ZEE".

It consists of two navaid equipments, a VOR and a DME. Both have the designator "BOZ".

Both have the same defined magnetic variation and are operational H24.

The VOR and the DME are located at the same position. Only the DME has a defined elevation of "30 meters".

Also, the Navaid has a location which, as there is no dislocation, is the same as the one for the navaid equipments.

The VOR does have a frequency, whereas for the DME a corresponding channel is defined.

The VOR in addition has a defined declination.

Also, the Coverage of the VOR and/or DME may be provided (note that this information is not required for the minimum/conditional AIP data set).

The figures below show the AIXM 5.1 encoding of some of the data described above.

The figure below shows the encoding of one of the referenced navaidEquipment of the figure above, viz. the VOR "DON"

The location is the same as for the Navaid.

Coding examples can also be found in the AIP Data Set - Specimen (DONLON):

No. Description XPath Expression

NAV-EX-01

VOR-EX-01

DME-EX-01

VOR/DME (incl. served aerodrome)

//aixm:NavaidTimeSlice [@gml:id ='NAV_BOR'] |

//aixm:VORTimeSlice [@gml:id ='VOR_BOR'] |

//aixm:DMETimeSlice [@gml:id ='DME_BOR']

NAV-EX-02

VOR-EX-02

VOR //aixm:NavaidTimeSlice [@gml:id ='NAV_EKO'] |

//aixm:VORTimeSlice [@gml:id ='NAV_EKO']

NAV-EX-03

NDB-EX-01

NDB (enroute) //aixm:NavaidTimeSlice [@gml:id ='NAV_NDB_DON'] |

//aixm:NDBTimeSlice [@gml:id ='NDB_DON']

NAV-EX-04

NDB-EX-02

NDB (Locator) //aixm:NavaidTimeSlice [@gml:id ='NAV_KL'] |

//aixm:NDBTimeSlice [@gml:id ='NDB_KL']

NAV-EX-05

NDB-EX-03

MKR-EX-01

NDB collocated with Marker Beacon

//aixm:NavaidTimeSlice [@gml:id ='NAV_SCN'] |

//aixm:NDBTimeSlice [@gml:id ='NDB_SCN'] |//aixm:MarkerBeaconTimeSlice [@gml:id ='MKR_SCN']

NAV-EX-06

LLZ-EX-01

GPT-EX-01

NDB-EX-02

MKR-EX-02

MKR-EX-03

ILS with MM and LOM //aixm:NavaidTimeSlice [@gml:id ='NAV_OXS'] |

//aixm:LocalizerTimeSlice [@gml:id ='LLZ_OXS'] |

//aixm:GlidepathTimeSlice [@gml:id ='GPT_OXS'] |

//aixm:NDBTimeSlice [@gml:id ='NDB_KL'] |

//aixm:MarkerBeaconTimeSlice [@gml:id ='MKR_OM27R'] |

//aixm:MarkerBeaconTimeSlice [@gml:id ='MKR_MM27R']

Child Pages

Basic Data for NavaidNavaid EquipmentLanding Systems & Navaid CollocationMagnetic VariationNavaid Position & ElevationHours of Operation for NavaidFacility coverageOperating Authority for NavaidNavaid Distance to Runway Centreline PointNavaid - AIXM Coding Checklist