Update: 173.625 FIRESCOPE Tertiary Crew is also in use.
From my location hearing these active frqs:
119.9750 Air to Air
135.9750 L.A. Co. Air Attack
164.1375 NIFC Tac 4
168.6000 NIFC Tac 3
168.6125 Ground units
167.95 Air to Ground Net might be where the heavy tankers are at.
A point of clarification, Tertiary Crew is a national assignment, not a FIRESCOPE assignment as FIRESCOPE is limited to California only. If you are not hearing it used for intra crew logistics then it is probably being used as a tactical. The best way to distinguish intra crew communications from tactical is that you will hear last and even first names on intra crew and you will hear normal resource designations on tactical (Engine 22, Water Tender 31, or the name of a crew such as Dalton, Bear Divide, etc.).
Note that 168.6125 is Secondary Intra Crew. All four of the new federal itinerant frequencies are designated for Intra Crew Communications but are not restricted to this use, in fact they may be used by any federal agency without restriction. The four replaced the former two, 163.100 and 168.350. My observation is that 168.6125 is used to replace 168.350, which was the most commonly assigned itinerant frequency in the radios of federal natural resource agencies.
Uplink, thanks for the live scanner feed link. I could not find it in my bookmarks and listened to it during the Day fire in 2006. I'm confined to a hospital bed for another 4 weeks, due to a hip fracture, and am a more than a captive audience for this online scanner and KTLA. I suppose it is what you would expect a retired firefighter to be doing while laid up.
I heard a channel being called "1U," I believe on a LA County fire frequency. It was supposed to be used as a tactical on the Sesnon incident. I would suppose that could be "Blue 1" but maybe they are distinguishing the VHF from the UHF tacticals by using the "U" with the channel number. I thought the two systems were distinguished using the words "Blue" (UHF) and "White" (VHF). If that is the case what is "1U?"