Not op and maybe I'm misunderstanding, but the correction is part of the spec in satellite design, not something that can be kept secret[1]. The timing code tha

Not op and maybe I'm misunderstanding, but the correction is part of the spec in satellite design, not something that can be kept secret[1]. The timing code that is translated into navigational data, however, is encoded and encrypted, which have some well-known keys, and that used to prevent high accuracy. My understanding is that the us government can change those to prevent GPS usage or to limit accuracy. [2] [1] http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.html http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.... [2] https://www.trimble.com/gps_tutorial/sub_pseudo.aspx https://www.trimble.com/gps_tutorial/sub_pseudo.aspx