Mac,
I believe you may be right about the TG 1009, it probably is a talkgroup for Nassau County Fire because their channels seem to go up in order starting at 1001 for A-1/dispatch. Not sure if it's used for their admin/ chiefs though, I am an avid listener to this system too and i've often wondered if there are anymore TG's being used on this system than what is already known. the 1100 numbered TG's are the SO talkgroups, but it could also be fernandina beach PD too because I believe they share the SO TG's w/ Fernandina Beach PD. But I cant confirm this being that their encrypted. I'm not sure about TG 1200 though, have no idea what that could be. Have you manged to find any more unknown TG's?, I've been trying to figure out whether or not the Nassau County Ocean Rescue shares TG 1401 w/ the Fernandina Beach Ocean Rescue or if they have a separate one, would you happen to know anything about that?. I believe they do share it but i'm not 100% sure seeing as how, mostly the Fernandina Beach guards do most of the talking on that particular channel, guess i'll have to wait till summer to find out. Let me know if you find any more new talkgroups, and i'll try and see if i can confirm that 1009 is indeed used by Nassau County Fire Rescue. Thanks.
-Evan