Stealthguy05 is correct. GA security is TGID 1 on 461.075 with a Color Code 1. I need to review some of my recordings to verify the slot. So far, there are no other users on the other slot.
When we attended the Haunt last year, they had a box of radios just for the security folks. I couldn't see a model number, but it is pretty obvious that Security is getting the newer radios.
I was wondering if they were going to roll out a DMR last year and maybe upgrade the whole thing to a CAP+. Cedar Fair is the company that runs Great America and Gilroy Gardens. I was surprised to hear that Gilroy Gardens abandoned their analog/repeater system and migrated to a CAP+ system. Given that GG gets much less traffic and money than GA, I was surprised they got the "better" radio system.
When I got the SDS100 last year, I was eager to see what I could decode, given how much IG traffic has transitioned over to Mototrbo. I took it to GA, and I was shocked that one of the security folks accurately identified the radio on site, and joked about how they'd need to turn on encryption. So he was aware of the technology. Oh, and he let me bring in the radio...