After switching much of their communications from Marine VHF Ch. 21 to LE Alpha (167.0875), USCG Station Tybee has changed frequencies again. I am now hearing traffic between Station Tybee and their small boats on 163.1375, which they refer to as "CG 113" in P25 digital mode. Some traffic is still on Marine VHF Ch. 21 (157.050) and all traffic with the MH-65s from Air Station Tybee is on Ch. 21 as well.
I'm assuming all of this is related to a transition to the RESCUE 21 system in the Sector Charleston area.
Mac McCormick III, KF4LMT
kf4lmt@comcast.net