I have a bunch of coordinates I need to check the proximity of. To limit the size of the coordinates to check, I would put them in a dictionary based on a hash of the current player map coordinate (example: W18). You know, this coordinate grid on the rust map. It would be like map regions that I could use as hashed key for "all coordinates in that zone".

How large is one such coordinate? The letter is horizontal, the number is vertical. Is it like 100x100 units in size?

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One square in the grid is 150m x 150m.