DO YOU NEED TO LOCATE AN AERODROME WORLDWIDE ...

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1.2 The boundaries of these areas need not necessarily coincide with the boundaries of any State, territory or FIR but are
decided solely from a consideration of the requirements of the AFS, so as to assist message traffic-routing processes to the
maximum possible extent.
1.3 Each separate State-or territory is assigned a separate identifying letter to permit differentiation between that State or
territory and other States or territories in the same AFS routing area.
1.4 Separate identifying letters are assigned to parts of a State or territory where:
a) a separate State or territory is itself an AFS routing area, and
b) routing uncertainties can exist at stations feeding traffic into that State or territory, and
c) by so doing these routing uncertainties can be removed or alleviated.
1.5 No separate identifying letter is assigned where a separate State or territory contains only tributary stations.
1.6 Unallocated letters within each AFS routing area may be assigned as additional letters, by ICAO, at the request of a
State having jurisdiction at location(s) within such area, in instances where additional assignment will facilitate the processes of
message routing. .
2. ASSIGNMENT OF LOCATION INDICATORS
2.1 Assignment of the first letter of â location indicator
The first letter of the location indicator shall be the letter assigned to the AFS routing area within which the location is situated,
except that where the location is served only by a single communication centre situated in another AFS routing area, the first
letter shall be that assigned to the area in which that communication centre is situated.
Note,—- An AFS routing area can consist of a single State.
2.2 Assignment of the second letter of a location indicator
The second letter of the location indicator shall be the letter assigned to the State or territory (or portion thereof) within which
the location is situated, except that where the location is served only by a single communication centre situated in another State
or territory, the second letter shall 'be that assigned to the State or territory in which that communication centre is situated.
2.3 Assignment of the third letter of a location indicator
Where, in a State -or territory, aeronautical fixed telecommunication stations are connected to a communication centre, the third
letter of the location indicator should be so assigned as to assist in the process of routing to that communication centre.
2.4 Assignment of the fourth letter of a location indicator
In respect of the fourth letter, and in instances where assignment of the second and third letters is not prescribed under 1.3 and
1.5, the State concerned shall assign the letters as desired, except that those States assigned the identifying letter "N" in
accordance with 2.2 should arrange their national allocation of specific four-letter location indicators so-as to avoid the-use of
the combination "NN" for the third and fourth letters.
Note,— It is intended that "NNN" should not be used as the second, third and fourth letters of a location indicator
2.5 Other assignments
2.5.1 In exceptional cases, geographical locations other than those served by the AFS may be given a location indicator at
the discretion of the State having jurisdiction over the location concerned.