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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 i spart 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 defines the particular spectrum characteristics or accuracy of the DME. The list of values for the CodeDMEType class contains:
| Value | Description |
|---|---|
| 'NARROW' | DME/N, narrow spectrum characteristics. |
| 'PRECISION' | DME/P, improved accuracy compared to DME/N |
| 'WIDE' | DME/W, wide spectrum characteristics. |
| 'OTHER' | Other. |
Elevation
PANS-AIM requires for the DME an elevation to be coded. The ElevatedPoint.elevation attribute is used for that purpose. Depending on the type of DME different accuracy is required (According PANS-AIM Appendix 1, Table A1-5, for DME.type equal-to 'PRECISION' 3m accuracy is required for all other types it is 30m (100ft).
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