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PANS-AIM does not require the type of the DME to be provided. However, PANS-AIM requires different accuracy values for the elevation of a DME depending on its type. As elevation for the DME is part of the minimum AIP data set the type has to be known. In AIXM the tye is coded using the DME.type attribute. The typr type defines the particular spectrum characteristics or accuracy of the DME. The list of values for the CodeDMEType class contains:
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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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The example below shows hoe this information may be published in the Remarks column of AD 2.19/AD3.18
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| It is just a distance value without a reference (e.g. to the THR) shall the reference be coded by a Note. |
Ghost Frequency
Altough not required by PANS-AIM, a "ghost frequency" will be coded in case of a stand-alone DME not collocated with a VOR.
The DME.ghostFrequency is used to code the frequency of a virtual VHF facility paired with the DME according to ICAO Annex 10.
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The example below shows the publication of a "ghost frequency" of a DME in ENR 4.1
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Navaid Collocation
A DME may be co-located with one and only one VOR or NDB.
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