7754 Vol 2 Flyleaf - ICAO Public Maps

IV-F1
Attachment F
CRITERIA FOR THE DEPLOYMENT OF VOR AND DME
EXPLANATION OF TERMS
1. When dealing with the deployment of radio
navigation aids and related matters, the terms listed below
should be used with the following meaning:
a) Designated operational range or height. The range or
height to which an aid is needed operationally in order to
provide a particular service and within which the facility
is afforded frequency protection.
Note 1.— The designated value for range or height is
determined in accordance with the criteria for the
deployment of the aid in question.
Note 2.— The designated value for range or height
forms the basis for the technical planning of aids.
b) Designated operational coverage. The term designated
operational coverage is used to refer to the combination
of the designated operational range and the designated
operational height (e.g. 200 NM/FL500).
Whenever possible, requirements (either civil, military
or both) for en-route and/or terminal navigation guidance
covering the same general area should be combined so
that they can be met by the minimum number of
individual facilities.
Note.— In many cases, e.g. in less complex terminal
areas and when route structure and airspace
considerations permit, one VOR, and an associated
DME if required, should be sufficient to cover the
terminal area provided such installations can be suitably
sited. Whenever practicable, such facilities should also
cover en-route requirements.
NUMBER 2: Differences between international and
national requirements for the same facility
Where a specific VORTAC or VOR/DME is serving
both international and national (civil and/or military)
requirements that are not identical as far as designated
operational range and/or height are concerned, the higher
of each of the respective values constitutes the combined
requirement.
CRITERIA
Compatibility of different
navigation systems
Overall system use accuracy of
VOR and DME
NUMBER 3: Overall system use accuracy
NUMBER 1: Combination of several requirements