re: Ice age relicts in Norway: recovered as millenium old ice melts

Maps made by the French had the Prime Meridian go through Paris and everything was tied to that.
Maps made by the British had their Prime Meridian go through London, and their maps were tied to that.

and they weren't the same.

Then along came satellites (after LORAN) and although shoreline shapes seldom changed (with apologies to the mouth of the Mississippi) French maps confused British sailors who could triangulate a location that made no sense if they were using French base maps of obscure locations.

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Pretty sure it's called the "Prime Meridium," champ.

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I'm pretty sure it's not, champ.