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Bone-shaped Fan Marker (MCL_4)
DGIF baseline 2026-1, the latest. Earlier baselines: timemap.
RDF: mcl_4.ttl
- Name
boneShapedFanMarker- Attribute
- MCL Marker Radio Beacon Class
- Definition
- A type of marker radio beacon, the emissions of which radiate in a vertical bone-shaped pattern for general use.
- Description
- The 'bone' shape refers to the radio signal emanating from the station, which protrudes an emission in the shape of a 1 nautical mile diameter tube from the surface to 300 metres (1000 feet) above ground level, and an emission in a sphere shape, beginning at 300 metres (1000 feet) above ground level, radiating across a 3 nautical mile diameter region. Bone-shaped markers are commonly used for timing approaches, as the emission is much smaller in diameter than the typical Z or Fan marker emission and thus is a much more accurate means of identifying the location of an aircraft on an approach than the other marker beacon types.
- Accepted
- 2013-10-18
- Allowed for
- GA039 Marker Radio Beacon
Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.