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QZSS (the Japanese GPS) is not autonomous. It uses GPS and use the additional satellite to improve precision. (see https://en.wikipedia.org/wiki/Quasi-Zenith_Sa

by Rexxar 12y ago

QZSS (the Japanese GPS) is not autonomous. It uses GPS and use the additional satellite to improve precision. (see https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System and https://en.wikipedia.org/wiki/GNSS_augmentation https://en.wikipedia.org/wiki/GNSS_augmentation)