I haven't done the math or tried out the locations (can't be bothered
as its not causing me the problem) but I do have more thoughts...

The Mercator distortion will be smaller near the equator and get less
and less significant as you zoom in (i.e. the map bounds get closer to
the centre)

I wouldn't be that suprised if the API does take a few short-cuts, for
example simplifying the getCenter maths, sacrificing a few metres
accuracy for execution speed.  It was never intended as a surveyor's
tool, after all.

Rounding errors will occur in the get/set centre process, inevitable
as we translate for lat/long to pixels and back, do some floating
point maths etc.  I'd agree these should not be significant.

What's 'significant'?  lats like -26.578515640327577 are supposedly
expressing location to within the width of a human hair.   Clearly the
map tiles aren't as accurate as that! So although the API accepts and
generates numbers like that, we must bear in mind its all pretty
meaningless after say the sixth decimal place.

How does the error you see work out in terms of metres across a given
km of map span, what sort of percentage is it?

cheers, Ross K

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