austraveller2017-08-19 10:34:51

https://sputniknews.com/asia/201708191056598613-japan-gps-system/

Japan launched the third of its new quasi-zenith satellites on Saturday to improve the global positioning system (GPS) navigation services in the country.

thrawn2017-08-19 15:08:53
不是说美国GPS更新版能达到这个指标的么?日本为何需要添加辅助卫星?