More reports have come in regarding the Coast Guard's Short Range Communications Upgrade System or SRCU.P-25 digital communications have been heard in the San Diego area on 416.5500 MHz, N293. And just received word that 412.9750 MHz, N293 has been active in the San Francisco Bay area. The 416.5500 MHz frequency was not identifed by a NET number, but apparently the 412.9750 MHz frequency is known as NET 409. Reports are that NET 409 was patched to NET 113 (163.1375 MHz) and 164.9000 MHz was heard active with the same radio.
I have included a listing of previously known Coast Guard UHF allocations and identified the current P-25 channels that are known. Keep searching for new allocations to possibly pop up.
406.5000
406.5625
406.5750
406.6000
406.8000
406.8125
406.9750
407.6250
407.9250
407.9750
408.4000
409.0000
409.1875
409.2000
409.3500
409.8250
410.0250
410.3750
411.3750
411.7875
412.9750 - NET 409
413.0000 - NET-410
413.0250
413.0375
414.7625
415.6250
415.7750
415.8250
415.9250
416.2250
416.3875
416.4750
416.5500 - NET-4xx
416.5750
416.5875
416.6000
416.6375
416.7000
416.7125
416.8500
416.9250
416.9375
417.0000
418.3500
418.4375
418.4500
419.1250
419.6000
419.6500
419.8000
419.8250
419.8500
419.9750
Oh, and the photo is the USCG tower in Kelso, Washington, with two VHF and one UHF land mobile antenna on board.