Cách hoạt động của hệ thống định vị GPS
GPS là hệ thống định vị toàn cầu được thiết kế, xây dựng, vận hành và quản lý bởi Bộ Quốc phòng Mỹ. Một số chức năng của GPS được cấp phép sử dụng miễn phí trên toàn thế giới.
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