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The airport reference point, as shown on the zoning plan, is the geometric centre of the runway thresholds, at grid coordinates 7 605 223.935 N, 385 471.969 E (latitude 68°32′09″ N, longitude 89°48′19″ W). It is located on the centre line of the strip surface at a distance of 823.55 m from the end of the strip surface associated with runway 05-23, and its assigned elevation is 10.63 m above sea level.
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The approach surfaces, as shown on the zoning plan, are described as follows:
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The outer surface, as shown on the zoning plan, is an imaginary surface extending outward from the airport reference point to a radius of 4 000 m. It is situated at a constant elevation of 45 m above the airport reference point, but at 9 m above the ground when that elevation would place the outer surface at less than 9 m above the ground.
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The strip surface, as shown on the zoning plan, is an imaginary rectangular surface described as follows:
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Each transitional surface, as shown on the zoning plan, is an imaginary inclined surface ascending at a ratio of 1 m measured vertically to 5 m measured horizontally at right angles to the centre line and projected centre line of the strip surface, extending upward and outward from the lateral limits of the strip surface and its approach surfaces to the intersection with the outer surface.
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The limit of the area containing the lands to which these Regulations apply is defined by a circle with a radius of 4 000 m centred on the airport reference point, as shown on the zoning plan.
