> The closer I am, the better the result seems to be.

Well, yes.  The mouse pointer position can only be determined within
one pixel of the displayed map.  As you zoom in, one pixel comes to
represent a smaller and smaller area.

The maps ARE different between zoom levels too.  Map-making is an
artform, not an exact representation of the earth's surface.  For
example, a red dot represent a city may measure tens of km across when
zoomed out and rather smaller as you zoom in.

Plus you are measuring your lat/longs to a ridiculous precision.  5 or
6 decimal places represents an accuracy of about 10m - you can throw
all the lesser digits away because the base maps certainly aren't that
accurate.

cheers, Ross K

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