Yeah. As I understand it, previously it wasn't possible to do dual-band GPS without using the encrypted military P(Y)-code because the unencrypted C/A code was

Yeah. As I understand it, previously it wasn't possible to do dual-band GPS without using the encrypted military P(Y)-code because the unencrypted C/A code was only on the L1 frequency, and for best accuracy you need dual-band to measure and compensate for ionospheric delay.