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Vertical Alarm Limit (VLI)
DGIF baseline 2026-1, the latest. Earlier baselines: timemap.
RDF: vli.ttl
- Name
verticalAlarmLimit- Datatype
- RealNonNegative
- Definition
- Half the length of a segment on the vertical axis (perpendicular to the horizontal plane of WGS-84 ellipsoid), which represents the maximum acceptable magnitude of error introduced by the navigation system, and yet still be usable for precision approach operations.
- Description
- The value ranges between 0.0 and 50.8 metres, inclusive, in steps of 0.2 metre.
- Accepted
- 2013-10-18
- Defined by
- DFDD
- Physical quantity
- length
- Recommended unit
- Metre (m)
- Used by
- GA281 Final Approach Segment (FAS) Data Block
Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.