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A comment on Time Card and PTP on a Raspberry Pi Compute Module 4. Parent comment
AIUI, urban canyons was one of the reasons why Japan built their QZSS system:
* https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System
* https://gssc.esa.int/navipedia/index.php/QZSS_Signal_Plan
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AIUI, urban canyons was one of the reasons why Japan built their QZSS system:
* https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System
* https://gssc.esa.int/navipedia/index.php/QZSS_Signal_Plan