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The ElevatedPoint.verticalDatum should be used to encode the corresponding information (e.g. 'EGM_96').
Operating Authority
See topic Operating Authority for Navaid.
Facility Coverage
See topic Facility coverage.
DME Displacement
This information is not required by PANS-AIM for the AIP data set, but often published in State AIPs. Also, ARINC 424
contains a data filed for the "VHF NAVAID" record type for "ILS/DME" Bias.
The DME.displace attribute is used to code the distance from the DME antenna to the position where the zero-range indication occurs in the DME receiver.
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