By correlating on a shared code. But please don't take my word for it, I don't even have a license. See this [1] excellent Reddit discussion. [1] https://www.r

By correlating on a shared code. But please don't take my word for it, I don't even have a license. See this [1] excellent Reddit discussion. [1] https://www.reddit.com/r/amateurradio/comments/49yuwx/til_gps_signal_are_so_weak_they_are_actually/ https://www.reddit.com/r/amateurradio/comments/49yuwx/til_gp...