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Circle is a simplified version of point
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of interest. The aircraft rotate around
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the target at a constant distance and
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height. We can only set the direction
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using the yellow arrow. I don't find
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this option very interesting. As with
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point of interest, we can do the same
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thing with many more option
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including the use of the two sticks of
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the remote controller to get closer or
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further away from the target and for
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ascending or descending.