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Wild GPS readings are removed for you

Now and then a robot reports a few seconds of positions that cannot be right. Left in, they could stretch the map or keep the aerial photo from lining up. Yardstick finds them and removes them by itself, so there is nothing for you to do.

Where it lives: Nowhere to find: it runs on its own, every hour

The short version Once an hour Yardstick looks at what your robot recorded since the last look. Any reading that cannot be right is removed, and the map and photo put themselves right.

Every reading from your robot gives its position twice: once from GPS and once from the robot's own map. The two normally agree closely, to within a few feet. When a reading has them hundreds of feet apart, it cannot be right. A single one could make the map zoom out so your yard sat small in one corner, or stop the aerial photo from lining up with your zones.

A map zoomed far out by one wild reading: the yard sits small in the top corner with fields and woods all around. — Before: one wild reading, more than 2,000 feet off, stretched this map.

The same map after the wild readings were removed: the yard fills the view with the drone photo lined up under the zones and path. — After: Yardstick removed the readings by itself and the map framed the yard again.

Good to know

Only readings that cannot be right. Yardstick removes a reading only when its two positions disagree by far more than GPS ever wanders, and only readings that claim a strong RTK fix. Ordinary wobble of a few feet stays in your recording.
A handful at most. A wild burst is usually a few seconds: a few readings out of the tens of thousands your robot records each day. Your coverage, paths and totals do not change in any way you could see.
Your photo stays where you put it. Removing readings never changes an aerial photo you moved with Align photo, or where your drone photo sits.
Something bigger is left alone. If a robot ever reported a large number of them at once, Yardstick removes nothing and flags it for us to look at instead.

Where it is available On Yardstick Anywhere now. In the installed Yardstick from the next release.