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I occasionally see civilians on Strava doing the same thing, running laps around the deck of a cruise ship. The speeds and distances look ridiculous.

101 assumptions programmers make about running apps.

23: The ground beneath the runner's feet has stable lat/lon.

There is no meaningful solution to this.

You could compare phone and watch coords assuming phone can be left in one spot.

There is no meaningful solution to this, besides just this one exception.