To satisfy the demands of civil aviation organizations and other users of satellite navigation systems for high-precision and high-integrity service performance. many countries and regions have established satellite-based augmentation systems (SBAS) referring to the Radio Technical Commission for Aeronautics (RTCA) service standards and agreements. The BeiDou SBAS (BDSBAS) provides bo... https://danddcollectiblers.shop/product-category/crosstown/