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All aerobatic competition flights must be flown inside defined space - aerobatic performance zone called Aerobatic Box. It is a cube in the air. All edges of that cube are 1000 m (3280 ft) long and the bottom wall is 100 m (328 ft) above the ground. This Box is the same for all categories. The axis and border of the box are marked on the ground. See the pictures below.
Pilots have to fly their competition flights inside the "Box".
Dimension of the Aerobatic Box
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Do not forget to set the altimeter to ZERO on the ground! Then you can check your AGL:
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What is on the ground
The border and axis (main and secondary or "cross box") of the box on the ground.
There are marks of both Box-axis: "T" at the ends, "+" in the middle and "I" between them.
And marks of Box-borders: "+" in the centre of the box and "L" in the border-corners.
Box marks and the judges' position:
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What you see from 2500 ft above the ground:
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