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Introduction & Background
This topic contains only PANS-AIM requirements relevant for a marker. For general PANS-AIM requirements valid for all kind of Radio navigation aids see topic Navaid [NAV] and subordinated pages.
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According to ICAO Annex 10
Chapter 3, the identification of markers part of an ILS should be as follows:
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See topic Basic Data for Navaid.
Hours of Operation
See topic Hours of Operation for Navaid.
Marker Frequency
In AIXM 5, the value of the radio emission frequency of the marker is coded by using the MarkerBeacon.frequency attribute.
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In general, marker beacons operate at 75 MHz.
Minor Axis Bearing
This information is not required by PANS-AIM. ARINC 424
defines a" Minor Axis Bearing (MINOR AXIS TRUE BRG)" data field for the "Airport Localizer Marker" records.
in AIXM 5 the MarkerBeacon.axisBearing attribute may be used to indicate the true bearing of the minor axis of marker beacons.
The figure below illustrates how the minor axis is defined for a marker.
Also in some AIPs this information is published.
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Position
In case a marker beacon collocated with an NDB (Locator) is physically located at the same position as the Locator, the geographic position (latitude and longitude) of the Locator is also the geographic position of the Marker.
In case a Marker is collocated with an NDB (Locator) and the geographic position of the Marker is different from the geographic position of the locator, some restrictions have to be taken into account (see coding rules below).
For more details see topic Navaid Position & Elevation.
Operating Authority
See topic Operating Authority for Navaid.
Facility Coverage
See topic Facility coverage.
Navaid Collocation
In case the marker is used as part of a ILS or Localizer system, the position of it within that system has to be coded.
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The figures below show the collocation of a middle marker with a locator.
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Coding
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The geographical distance between the MarkerBeacon.location and the NDB.location used as NavaidEquipment for the same Navaid instance must be less than 100 metres.
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Coding Examples
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Examples
Coding examples can also be found in the AIP Data Set - Specimen (DONLON):
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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'] |
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 ='NDB_SCN'] |