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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.
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| Identifier | Data Encoding Rule | Justification | Data Verification Rule (UID) | Remarks | |||||
|---|---|---|---|---|---|---|---|---|---|
| MKR-101 | The MarkerBeacon.designator attribute is mandatory for en-route markers. | Minimum AIP data set | TBD | ||||||
| The MarkerBeacon.auralMorseCode attribute is mandatory for markers forming part of an ILS facility. | Minimum AIP data seset | TBD | |||||||
| MKR-102 | The MarkerBeacon.name attribute is mandatory. | Minimum AIP data set | TBD |
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| MKR-103 | The MarkerBeacon.frequency attribute is mandatory. | Minimum AIP data set | TBD | ||||||
| MKR-104 | The MarkerBeacon.location attribute is mandatory. | Minimum AIP data set | TBD | ||||||
| MKR-105 | The NDB.designator shall not be duplicated within 600 NM of the location of the NDB. | EAD / ICAO Annex 11 | TBD | ||||||
| MKR-106 | The value of the MarkerBeacon.frequency must be '75' 'MHz'. | EAD | TBD | ||||||
| MKR-107 | The value of the NavaidComponent.markerPosition must be different for each MarkerBeacon that is used as NavaidComponent of the same Navaid instance which type is equal-to 'ILS' or 'ILS_DME' or 'LOC' or 'LOC_DME' . | EAD | TBD | ||||||
| NDB-108 | 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. | EAD | TBD | ||||||
| MKR-109 | No more than one MarkerBeacon may be co-located with same NDB. | EAD | TBD |
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TBD in the scope of the DONLON AIXM AIP data set.