A number identifying a quadrant of a <
as defined by the centre-line of the <
> and a perpendicular to the centre-line of the <
> intersecting at the centre point of the <
>. The centre point of the <
> is defined as falling midway between the <
>s. Quadrant identifiers are assigned such that quadrants 1 and 2 are on one side and quadrants 3 and 4 are on the other side of the centre-line of the <
>. Quadrant identifiers only apply to the following imaginary air navigation
s of <
>s: inner horizontal, conical, and outer horizontal.
Attribute value type:
, Annex B: QUD]
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