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The rank attribute should be coded in accordance with the usage not with local terminology. For the usage of the values provided for the rank attribute the following rules should be taking into account:
| CodeFacilityRankingType | Rule | ||
|---|---|---|---|
| PRIMARY | Use for main/normal frequency | ||
| SECONDARY | Use for secondary frequency and also if other terms (stand-by freq, back-up freq, alternate freq) are used in the sense of a secondary frequency | ||
| EMERG | Use for emergency frequency, e.g. 121.500 MHZ (Aeronautical emergency frequency), 123.100 MHZ (Auxiliary frequency (SAR)) | ||
| GUARD | Use if used in the sense of "listening only" frequency, except for emergency frequencies | ||
| ALTERNATE |
Use for other than specified purpose (e.g. available on request only). |
Annex 10, Volume V, Chapter 4 ,contain a general allotment of the frequency band 117.975 – 137 MHz. The main subdivisions of this band are the frequency bands allocated to both international and national services and frequency bands solely allocated to national services. Specific allotments to services are to be determined regionally. The figure below shows the special frequencies and allotments (Annex 10)
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