In short, you can treat the local geometry as Euclidean.
Or, to put it simply, the shape of the Earth can be considered flat for local mapping purposes.
If grid north and true north are the same everywhere, it would be proof the entire Earth is flat.
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Or, to put it simply, the shape of the Earth can be considered flat for local mapping purposes.
If grid north and true north are the same everywhere, it would be proof the entire Earth is flat.