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... it should, I guess, be written for where it's set - except in this case it (eventually) spans the globe...
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No, I do not agree... at least not completely. It should be written from where the CHARACTERS come from. So if it is an American who travels to Europe.. he/she will think in feet/inches... and do conversions. It does not matter where the story ends up, it matters what the characters would say/do.
As an American I might walk in to a bar in Europe and ask "How far to the nearest hotel?" and they might say, "Around 5k" and in my head I would think "That is about 3.1 miles."
The setting might be global, but the characters are finite.
When I read/write fantasy, I use/see "fantasy" units like " a day's ride." So I really do think genre matters a bit.
In your case, I would probably stick with meters.