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I wonder what's going on here: http://labs.strava.com/heatmap/#17/-0.01296/51.49360/gray/bi...

The location corresponds to a supermarket.

Just speculation, but I've sometimes seen GPS traces like that when a unit enters a building. You can get a very erratic, low-accuracy set of data points back that look qualitatively similar to the pattern in your link.

Interesting. Thanks.

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