[simgt]

I believe this is demonstrating the performance improvement of RTK [0] alone, not dead reckoning. GPS + dead reckoning is what phones and wearable do afaik, whereas RTK requires getting correction data associated to base stations nearby and seems mostly relevant for industrial applications (you need a subscription in the case of u-blox).

[0] https://en.wikipedia.org/wiki/Real-time_kinematic_positionin...