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I would strongly recommend against overwriting the ZoomOut function because that is going to taint the world map.
You're also changing the behavior of ZoomOut to the point where it won't function correctly.
If ZoomOut is called from a map other than the current one, you're setting it to the current map then calling ZoomOut, so it will only ever switch to the map above the current one, and you aren't returning anything (it's supposed to return whether it can zoom out or not).
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