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- Inner marker (IM): dots only,
- Middle marker (MM): Alternate dot and dash,
- Outer marker (OM): 2 dashes,
- Backcourse marker (BCM): shall be clearly distinguishable from the inner, middle and outer marker beacon identification.
In some States markers may also have alphanumeric designators.
The long name given to the DME marker is coded using the MarkerBeacon.name attribute.
Also for markers used at aerodrome/heliport (in general as part of an ILS) a name may be encoded, using the corresponding airport/heliport and/or the concerned runway direction. Examples: 'ESNL OM 14', 'OM 09R', 'WEST', etc.
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The examples below show the name and designator of marker beacons as they may be published in AD 2.19. |
Aerodrome Served
See topic Basic Data for Navaid.
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Usually, the NBD collocated with a Marker marker is a Locator locator (see also topic NDB), whereas the Locator locator in conjunction with the collocated Marker marker is used for ILS approaches.
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There are certain ICAO rules with regard to the relative distance between the Marker marker and the Locatorlocator. They are mentioned as coding rules.
A marker (and NDB) may only maintain a single collocation relationship at a time, which means that it is not possible to collocate a Marker marker with two different NDBs, and vice versa.
For more details see also topic Navaid Component & Navaid Colocation.
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The figures below show the collocation of a middle marker with a locator. |
Coding Rules for Marker Beacon
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