Except that I am not. @martinvermeer , can you explain? Different coordinate system? The artist has been a bit careless? The milestone is perhaps 180 m to west and a bit to the north from those coordinates.Edit: I refreshed my memory of this stuff, and yep, the X and Y values are (of course) old YKJ coordinates, and seem to be very correct. The geographical coordinates are then for the corresponding ellipsoid etc, not WGS84 ones. And the error matches the expected.