What’s really interesting is the mild longitudinal shifts while latitudes are really good. No doubt this was in large part because we can use the direction of the sun and stars to get North or South, but for east or west you were much more dependent on precision timekeeping.
I like the INS approach, but couple that with cameras to correct for random walk error (this is much like our eyes correcting for our inner ear.)
I think the issue with Google maps requiring GPS differentials for getting your trajectory has mostly to do with it being agnostic of your phone’s orientation while moving.
Just so you know, each of the headlines you posted suggested that China’s consumption of coal is more than ever before, in agreement with the prior poster. Also clean coal has nothing to do with CO2 reduction, it’s scrubbing other nasties like SO2.
It’s good that they’re expecting this to max out imminently, but it’s still a max.