MOD and Arrays

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How do I get a 100 X 100 dynamic Array from 10,000 X 10,000 static array.
Let me explain what I mean.
Say I have a world of 10,000 X 10,000 Tiles.
My play area is 100 X 100 Tiles.
Every time I move in any direction by more then 10 Tiles, I want to create a new Array
of 100 X 100 Tiles from the static Array with me at the centre.
Moved over 10 tiles in the static array of course.
How would I do this? I think it has something to do with the MOD math function.
Can anyone help me Please!