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The title is very misleading. The technique (RTK) depends on using a second receiver, not just a smartwatch on its own.

Title is fine. The key is the plural, smartwatches. From the actual article:

> No geodetic station is involved in this study, as one of the smartwatches serves as the base station.

Ah yes, somehow I missed this :-S. Would edit my comment if I could.

Oh, that's interesting, I have to read it... Did they set up the smartwatch in a fixed place?