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The path taken did not traverse the boundary of every atom along the way, or even every grain of sand.

Even if it had, the airtag location service is not accurate enough to have detected that.

Not really, if you had every grain of sand in the way it would diverge to a much bigger value. The problem is that the roads have >1 dimension at that scale, apple maps is definitely adding up to many details along the way, it's not a straight line and it ends up being 10x the actual distance. No Biggie.

The "fix" is to smooth those details as the straight line distance grows bigger.

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