I'm in the Jacksonville, FL area for a while and caught some Coast Guard traffic on both VHF and UHF channels recently.
162.3250 MHz, N293 NET111 - SECTOR JACKSONVILLE with various CG assets. SECTOR in the clear, but field units always encrypted.
412.9750 MHz, N293 NET409 - SECTOR JACKSONVILLE with what seemed to be CG helicopters, usually CG6xxx numbers. Again, SECTOR JAX in the clear with others secure. The NET number was confirmed by the SECTOR JAX radio operator, and also confirms another rumor that the CG UHF channels are being used primarily by airborne assets of the Coast Guard.