A number identifying a section of the imaginary <
> air navigation primary
. The <
is divided into sections: (a) the 60,96 metre (200 feet) sections of the <
from the <
>s and working outward, (b) the approximately 914,4 metres (3 000 feet) sections starting from the <
>s and working inward, and (c) any middle section left over from (b). Each of these sections is numbered.
Attribute value type:
, Annex B: PSN]
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