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Yeah really - it's half centimeter nav according to BG. Ctrl-f for centimeter:

https://arstechnica.com/space/2024/10/spacex-catches-returni...

Surveying GPS can do that with WAAS and a bunch of integration time and extra receivers, but not in real time:

https://www.gps.gov/systems/gps/performance/accuracy

So that's why I think they need to have a high resolution, close range, 3d positioning method for the final seconds.




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