Chris Parris' Monitoring Times Fedcom Blog reports more USCG activity in the 405-420 MHz band. 413.000 has been logged active as "CG 410" here in Savannah; now 412.975 has been logged active as "CG 409" in San Francisco. Additionally, 416.550 has also been heard in California but no designator has been ascertained. He also indicates that these UHF frequencies are part of the USCG SCRU (Short Range Communications Upgrade system). For more info on what is being heard, check out the MT Fedcom Blog at the link above.
As I've mentioned several times before, it is time to start searching for new USCG frequencies; their communications are in a state of change. One of the fun things about the radio hobby is searching down new communications systems!
Mac McCormick III, KF4LMT