Air Force Will Add Navigation Message to L2C Signal in Fall 2009
In fall of 2009, the U.S. Air Force will begin broadcasting a transitional civil navigation (CNAV) message on the GPS L2 civil signal (L2C) now being transmitted on the modernized Block IIR (IIR-M) satellites. Currently, L2C is being broadcast as a dataless sequence without modulation.
By Glen Gibbons