Don't you mean... M-code? (meaning "military" code) https://en.wikipedia.org/wiki/GPS_signals#Military_.28M-code.29 https://en.wikipedia.org/wiki/GPS_signals#M

Don't you mean... M-code? (meaning "military" code) https://en.wikipedia.org/wiki/GPS_signals#Military_.28M-code.29 https://en.wikipedia.org/wiki/GPS_signals#Military_.28M-code... Though I'm honestly surprised I've "known" of GPS for this long and never realized there were a variety of codes. Legacy--some still operating, modern, military, and more. I'm going to enjoy binge reading this wiki/math stuff tomorrow.